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GNUMICR - SANDEEN
MICR printing is a very tricky business, and it requires a very good printer and magnetic (MICR) toner to do it properly. Any problems with this font may result in a high (possibly 100%) reject rate from your bank, and they may charge you for this. However, by developing this font in an open manner, I hope to be able to develop the best Type 1FREECHECK - SANDEEN
FreeCheck is a free check printing utility. You can use it to print your own checks on blank check stock , available at office supply stores and various places around the web. To do this right, you also need magnetic / MICR toner to print the MICR line at the bottom of the check. MONITORING A TRIANGLE TUBE PRESTIGE SOLO BOILER WITH MODBUS Get a Triangle Tube Prestige boiler with ModBus interface (Other models may work too) Get a cheap USB to RS-485 adapter like this one from Amazon. Wire it to your boiler's ModBus connections (AA, BB) Plug it into a low-power Linux computer like Raspberry Pi. Set your boiler to ModBus Address 1. Test it with this little program. HEATING WITH A MINI-SPLIT? LOOKING AT COSTS & EMISSIONS Looks like a win. With the following assumpti0ns (take a look at the spreadheet to alter them): 82 AFUE boiler, $0.71/therm natural gas, $0.10/kWh electricity, a 12 HSPF heat pump, and 1161 lbs CO2 per MWh, it looks about break-even on operating costs, but about a 30% reduction in CO2. Of course things like energy costs and carbon intensity vary by region; for carbon intensity numbers for your RETURN OF THE LOW-POWER SERVER: A 10W, 6.5 TERABYTE If you run a server 24/7 at home, that always-on power consumption can really add up. If you have an old beast running at 250W, that’s using about 2MWh of power per year, and will cost you over $200/year in electricity at $0.10/kWh. A 10W build uses only 4% of that! Here’s how I put it together: Jetway NF9W quad-core Celeron N2930 USING A WIFI THERMOSTAT API The API describes a JSON interface to the thermostat, so you can retrieve or send information using http. For example: We can get current temperature, set point, mode (heating, cooling, or off), humidity (on some models) etc. And it’s not just a read-only interface; you can set parameters like target temp, schedules, etc, aswell as display
NEPTUNE RF WATER METER FREQUENCY HOPPING PATTERN Neptune RF water meter frequency hopping pattern. A couple of years ago, my water utility installed new remote-read water meters, Neptune e-Coder R900i, in every home in their service area. As any casual reader of this blog knows, I’m a big fan of measuring and data whenit
ENPHASE SOLAR MICROINVERTER CLIPPING ANALYSIS Enphase Solar Microinverter Clipping Analysis. Posted on May 25, 2013 by Eric Sandeen. I wanted to look at how much the “clipping” behavior of power-limited solar microinverters affected my annual energy production. The TL;DR version is: at worst, 2012 NISSAN LEAF BATTERY DEATHWATCH 2012 Nissan LEAF battery deathwatch. First of all – I think EVs are great. They are the future of personal transportation. But this is the story of a first-gen EV battery with some issues. I bought a used 2012 Nissan LEAF with about 38k miles for a great price – in part because it started life as a leased car in Texas, and the early THERMS PER HEATING DEGREE DAY Therms per Heating Degree Day. Posted on December 21, 2011 by Eric Sandeen. Click for interactive graph. In an earlier post I had tried out a few ways to figure out if our energy-saving efforts with respect to natural gas use were paying off; I did a few bar graphs of therms per day, per heating degree day, rolling yearly averages, etc.GNUMICR - SANDEEN
MICR printing is a very tricky business, and it requires a very good printer and magnetic (MICR) toner to do it properly. Any problems with this font may result in a high (possibly 100%) reject rate from your bank, and they may charge you for this. However, by developing this font in an open manner, I hope to be able to develop the best Type 1FREECHECK - SANDEEN
FreeCheck is a free check printing utility. You can use it to print your own checks on blank check stock , available at office supply stores and various places around the web. To do this right, you also need magnetic / MICR toner to print the MICR line at the bottom of the check. MONITORING A TRIANGLE TUBE PRESTIGE SOLO BOILER WITH MODBUS Get a Triangle Tube Prestige boiler with ModBus interface (Other models may work too) Get a cheap USB to RS-485 adapter like this one from Amazon. Wire it to your boiler's ModBus connections (AA, BB) Plug it into a low-power Linux computer like Raspberry Pi. Set your boiler to ModBus Address 1. Test it with this little program. HEATING WITH A MINI-SPLIT? LOOKING AT COSTS & EMISSIONS Looks like a win. With the following assumpti0ns (take a look at the spreadheet to alter them): 82 AFUE boiler, $0.71/therm natural gas, $0.10/kWh electricity, a 12 HSPF heat pump, and 1161 lbs CO2 per MWh, it looks about break-even on operating costs, but about a 30% reduction in CO2. Of course things like energy costs and carbon intensity vary by region; for carbon intensity numbers for your RETURN OF THE LOW-POWER SERVER: A 10W, 6.5 TERABYTE If you run a server 24/7 at home, that always-on power consumption can really add up. If you have an old beast running at 250W, that’s using about 2MWh of power per year, and will cost you over $200/year in electricity at $0.10/kWh. A 10W build uses only 4% of that! Here’s how I put it together: Jetway NF9W quad-core Celeron N2930 USING A WIFI THERMOSTAT API The API describes a JSON interface to the thermostat, so you can retrieve or send information using http. For example: We can get current temperature, set point, mode (heating, cooling, or off), humidity (on some models) etc. And it’s not just a read-only interface; you can set parameters like target temp, schedules, etc, aswell as display
NEPTUNE RF WATER METER FREQUENCY HOPPING PATTERN Neptune RF water meter frequency hopping pattern. A couple of years ago, my water utility installed new remote-read water meters, Neptune e-Coder R900i, in every home in their service area. As any casual reader of this blog knows, I’m a big fan of measuring and data whenit
ENPHASE SOLAR MICROINVERTER CLIPPING ANALYSIS Enphase Solar Microinverter Clipping Analysis. Posted on May 25, 2013 by Eric Sandeen. I wanted to look at how much the “clipping” behavior of power-limited solar microinverters affected my annual energy production. The TL;DR version is: at worst, 2012 NISSAN LEAF BATTERY DEATHWATCH 2012 Nissan LEAF battery deathwatch. First of all – I think EVs are great. They are the future of personal transportation. But this is the story of a first-gen EV battery with some issues. I bought a used 2012 Nissan LEAF with about 38k miles for a great price – in part because it started life as a leased car in Texas, and the early THERMS PER HEATING DEGREE DAY Therms per Heating Degree Day. Posted on December 21, 2011 by Eric Sandeen. Click for interactive graph. In an earlier post I had tried out a few ways to figure out if our energy-saving efforts with respect to natural gas use were paying off; I did a few bar graphs of therms per day, per heating degree day, rolling yearly averages, etc.GNUMICR - SANDEEN
MICR printing is a very tricky business, and it requires a very good printer and magnetic (MICR) toner to do it properly. Any problems with this font may result in a high (possibly 100%) reject rate from your bank, and they may charge you for this. However, by developing this font in an open manner, I hope to be able to develop the best Type 1 GETTING INTO HOT WATER, FAST! This wastes water, energy, and time, because 40 feet of three-quarter-inch pipe can hold a gallon (about 4 liters) of water, and running a gallon through a 2.0gpm faucet or shower takes 30 seconds. When you’re done, a nice hot gallon of water sits there cooling off. So depending on the time since the last draw, you’ve wasted up to a gallonERIC'S BLOG
Posted on January 22, 2014 by Eric Sandeen. 26. The Taco SmartPlus hot water recirculation pump is designed to push domestic hot water around a recirculation loop, so that hot water is at the taps when you want it, saving time as well as water down the drain while you wait. It’s designed to learn your schedule, to avoid energy losses ERIC'S LAME HOMEPAGE Samsung Phone Sync - SamBru. SamBru (Samsung Backup and Restore Utility) is a fairly simple Perl script that will read and write the phone list, calendar, and todo list in Samsung SCH-6100 and SCH-8500 phones. It can save to vCard and vCalendar format, so you can use other apps to edit the data, including GnomeCard and GnomeCal. THERMS VS. HEATING DEGREE DAYS, 65F BASE Therms vs. heating Degree Days, 65F Base. click legend labels to toggle data sets on or off. This is a scatterplot of therms used vs. heating degree days for several LED LIGHTING ECONOMICS I broke down and tried a couple LED bulbs in my house. We have track lighting in the kitchen with PAR20 bulbs, usually the 50W halogen type. The Home Depot recently started carrying some decent LE THE PERFECT PORCHLIGHT? Most importantly, it’s instant-on, even in the cold. At 8.6W, it’s 14% of the power draw of a 60W bulb. You could almost leave it on all night, and not feel too bad about it. Porch lights are often left on for a long time; sometimes essentially forever. A 60W bulb burning 24/7 uses 44kWh/month; burning 12h a day uses 22kWh/month. HOW TO BUILD AN 18W, 4 TERABYTE, COMMODITY X86 LINUX I wonder if my UPS built-in load meter reads out low (I’ll have to put it on the kill a watt to check). But I have a reading around 40w with two servers running – one is a dual-core conroe 6600 (2.4 ghz) and the other is a new sandy bridge i5-2500k. RESIDENTIAL BOILER MONITORING VIA MODBUS Per the boiler docs, the ModBus interface is Modbus/RTU using RS-485 for the physical layer. First thing, obviously, is to find an RS-485 adapter. Fortunately, I found one super cheap (under $10) at Amazon, a “ Kedsum USB to RS485 Converter ” and despite the cheap price and appearance, it seems to work just fine: The adapter only has I GAVE IN: MINI-SPLIT A/C A Hot Summer. 2012 was a hot one. We’ve had at least 31 days over 90F, something which hasn’t happened since 1988, and July 2012 was the second warmest July on record in the Twin Cities. This is a departure from the norm; for example the average number of 90F days is13 –
GNUMICR - SANDEEN
MICR printing is a very tricky business, and it requires a very good printer and magnetic (MICR) toner to do it properly. Any problems with this font may result in a high (possibly 100%) reject rate from your bank, and they may charge you for this. However, by developing this font in an open manner, I hope to be able to develop the best Type 1FREECHECK - SANDEEN
FreeCheck is a free check printing utility. You can use it to print your own checks on blank check stock , available at office supply stores and various places around the web. To do this right, you also need magnetic / MICR toner to print the MICR line at the bottom of the check. ERIC'S LAME HOMEPAGE Samsung Phone Sync - SamBru. SamBru (Samsung Backup and Restore Utility) is a fairly simple Perl script that will read and write the phone list, calendar, and todo list in Samsung SCH-6100 and SCH-8500 phones. It can save to vCard and vCalendar format, so you can use other apps to edit the data, including GnomeCard and GnomeCal. HEATING WITH A MINI-SPLIT? LOOKING AT COSTS & EMISSIONS Looks like a win. With the following assumpti0ns (take a look at the spreadheet to alter them): 82 AFUE boiler, $0.71/therm natural gas, $0.10/kWh electricity, a 12 HSPF heat pump, and 1161 lbs CO2 per MWh, it looks about break-even on operating costs, but about a 30% reduction in CO2. Of course things like energy costs and carbon intensity vary by region; for carbon intensity numbers for your RETURN OF THE LOW-POWER SERVER: A 10W, 6.5 TERABYTE If you run a server 24/7 at home, that always-on power consumption can really add up. If you have an old beast running at 250W, that’s using about 2MWh of power per year, and will cost you over $200/year in electricity at $0.10/kWh. A 10W build uses only 4% of that! Here’s how I put it together: Jetway NF9W quad-core Celeron N2930 NEPTUNE RF WATER METER FREQUENCY HOPPING PATTERN Neptune RF water meter frequency hopping pattern. A couple of years ago, my water utility installed new remote-read water meters, Neptune e-Coder R900i, in every home in their service area. As any casual reader of this blog knows, I’m a big fan of measuring and data whenit
USING A WIFI THERMOSTAT API The API describes a JSON interface to the thermostat, so you can retrieve or send information using http. For example: We can get current temperature, set point, mode (heating, cooling, or off), humidity (on some models) etc. And it’s not just a read-only interface; you can set parameters like target temp, schedules, etc, aswell as display
ENPHASE SOLAR MICROINVERTER CLIPPING ANALYSIS Enphase Solar Microinverter Clipping Analysis. Posted on May 25, 2013 by Eric Sandeen. I wanted to look at how much the “clipping” behavior of power-limited solar microinverters affected my annual energy production. The TL;DR version is: at worst, THERMS PER HEATING DEGREE DAY Therms per Heating Degree Day. Posted on December 21, 2011 by Eric Sandeen. Click for interactive graph. In an earlier post I had tried out a few ways to figure out if our energy-saving efforts with respect to natural gas use were paying off; I did a few bar graphs of therms per day, per heating degree day, rolling yearly averages, etc. 2012 NISSAN LEAF BATTERY DEATHWATCH 2012 Nissan LEAF battery deathwatch. First of all – I think EVs are great. They are the future of personal transportation. But this is the story of a first-gen EV battery with some issues. I bought a used 2012 Nissan LEAF with about 38k miles for a great price – in part because it started life as a leased car in Texas, and the earlyGNUMICR - SANDEEN
MICR printing is a very tricky business, and it requires a very good printer and magnetic (MICR) toner to do it properly. Any problems with this font may result in a high (possibly 100%) reject rate from your bank, and they may charge you for this. However, by developing this font in an open manner, I hope to be able to develop the best Type 1FREECHECK - SANDEEN
FreeCheck is a free check printing utility. You can use it to print your own checks on blank check stock , available at office supply stores and various places around the web. To do this right, you also need magnetic / MICR toner to print the MICR line at the bottom of the check. ERIC'S LAME HOMEPAGE Samsung Phone Sync - SamBru. SamBru (Samsung Backup and Restore Utility) is a fairly simple Perl script that will read and write the phone list, calendar, and todo list in Samsung SCH-6100 and SCH-8500 phones. It can save to vCard and vCalendar format, so you can use other apps to edit the data, including GnomeCard and GnomeCal. HEATING WITH A MINI-SPLIT? LOOKING AT COSTS & EMISSIONS Looks like a win. With the following assumpti0ns (take a look at the spreadheet to alter them): 82 AFUE boiler, $0.71/therm natural gas, $0.10/kWh electricity, a 12 HSPF heat pump, and 1161 lbs CO2 per MWh, it looks about break-even on operating costs, but about a 30% reduction in CO2. Of course things like energy costs and carbon intensity vary by region; for carbon intensity numbers for your RETURN OF THE LOW-POWER SERVER: A 10W, 6.5 TERABYTE If you run a server 24/7 at home, that always-on power consumption can really add up. If you have an old beast running at 250W, that’s using about 2MWh of power per year, and will cost you over $200/year in electricity at $0.10/kWh. A 10W build uses only 4% of that! Here’s how I put it together: Jetway NF9W quad-core Celeron N2930 NEPTUNE RF WATER METER FREQUENCY HOPPING PATTERN Neptune RF water meter frequency hopping pattern. A couple of years ago, my water utility installed new remote-read water meters, Neptune e-Coder R900i, in every home in their service area. As any casual reader of this blog knows, I’m a big fan of measuring and data whenit
USING A WIFI THERMOSTAT API The API describes a JSON interface to the thermostat, so you can retrieve or send information using http. For example: We can get current temperature, set point, mode (heating, cooling, or off), humidity (on some models) etc. And it’s not just a read-only interface; you can set parameters like target temp, schedules, etc, aswell as display
ENPHASE SOLAR MICROINVERTER CLIPPING ANALYSIS Enphase Solar Microinverter Clipping Analysis. Posted on May 25, 2013 by Eric Sandeen. I wanted to look at how much the “clipping” behavior of power-limited solar microinverters affected my annual energy production. The TL;DR version is: at worst, THERMS PER HEATING DEGREE DAY Therms per Heating Degree Day. Posted on December 21, 2011 by Eric Sandeen. Click for interactive graph. In an earlier post I had tried out a few ways to figure out if our energy-saving efforts with respect to natural gas use were paying off; I did a few bar graphs of therms per day, per heating degree day, rolling yearly averages, etc. 2012 NISSAN LEAF BATTERY DEATHWATCH 2012 Nissan LEAF battery deathwatch. First of all – I think EVs are great. They are the future of personal transportation. But this is the story of a first-gen EV battery with some issues. I bought a used 2012 Nissan LEAF with about 38k miles for a great price – in part because it started life as a leased car in Texas, and the earlyFREECHECK - SANDEEN
FreeCheck is a free check printing utility. You can use it to print your own checks on blank check stock , available at office supply stores and various places around the web. To do this right, you also need magnetic / MICR toner to print the MICR line at the bottom of the check.ERIC'S BLOG
The LeafSPY stats on the new battery actually dropped fairly quickly after I got it which was worrisome, but now (in the very cold weather) it’s holding steady at about 97% state of health, with 62.3Ahr and 90.35Hx. The stats when it finally dropped the 9th bar were: Miles: 40623 Ahr: 43.51 Hx: 45.25. USING A WIFI THERMOSTAT API The API describes a JSON interface to the thermostat, so you can retrieve or send information using http. For example: We can get current temperature, set point, mode (heating, cooling, or off), humidity (on some models) etc. And it’s not just a read-only interface; you can set parameters like target temp, schedules, etc, aswell as display
THERMS VS. HEATING DEGREE DAYS, 65F BASE Therms vs. heating Degree Days, 65F Base. click legend labels to toggle data sets on or off. This is a scatterplot of therms used vs. heating degree days for several LED LIGHTING ECONOMICS Agreed, some of the CFLs were dismal. Others were great. Like anything, a market grew up and people went in for a quick buck. I think that other than reliability, the new lighting facts guides should really help consumers know what they’re getting. THE PERFECT PORCHLIGHT? Most importantly, it’s instant-on, even in the cold. At 8.6W, it’s 14% of the power draw of a 60W bulb. You could almost leave it on all night, and not feel too bad about it. Porch lights are often left on for a long time; sometimes essentially forever. A 60W bulb burning 24/7 uses 44kWh/month; burning 12h a day uses 22kWh/month. RESIDENTIAL BOILER MONITORING VIA MODBUS Per the boiler docs, the ModBus interface is Modbus/RTU using RS-485 for the physical layer. First thing, obviously, is to find an RS-485 adapter. Fortunately, I found one super cheap (under $10) at Amazon, a “ Kedsum USB to RS485 Converter ” and despite the cheap price and appearance, it seems to work just fine: The adapter only has TURTLE BEACH AUDIO ADVANTAGE MICRO / CM-102 GUTS Turtle Beach Audio Advantage Micro / C-Media CM-102. Works fine by default w/ the usb-audio linux driver with normal analog output. It's USB vendor:product 0x0d8C:0x0001, which indicates a I GAVE IN: MINI-SPLIT A/C A Hot Summer. 2012 was a hot one. We’ve had at least 31 days over 90F, something which hasn’t happened since 1988, and July 2012 was the second warmest July on record in the Twin Cities. This is a departure from the norm; for example the average number of 90F days is13 –
PSEUDO-RIGHTEOUSNESS Pseudo-righteousness. Posted on March 22, 2010 by Eric Sandeen. Wow. So Stephen Colbert interviewed Mary Matalin the other day. He heads right in, spots the cross she’s wearing, and says, riffing on Glen Beck: Colbert: “Now why are you wearing a cross you know Jesus preached Social Justice – it makes you look like a Commie.”.GNUMICR - SANDEEN
MICR printing is a very tricky business, and it requires a very good printer and magnetic (MICR) toner to do it properly. Any problems with this font may result in a high (possibly 100%) reject rate from your bank, and they may charge you for this. However, by developing this font in an open manner, I hope to be able to develop the best Type 1 MONITORING A TRIANGLE TUBE PRESTIGE SOLO BOILER WITH MODBUS Get a Triangle Tube Prestige boiler with ModBus interface (Other models may work too) Get a cheap USB to RS-485 adapter like this one from Amazon. Wire it to your boiler's ModBus connections (AA, BB) Plug it into a low-power Linux computer like Raspberry Pi. Set your boiler to ModBus Address 1. Test it with this little program. ERIC'S LAME HOMEPAGE Samsung Phone Sync - SamBru. SamBru (Samsung Backup and Restore Utility) is a fairly simple Perl script that will read and write the phone list, calendar, and todo list in Samsung SCH-6100 and SCH-8500 phones. It can save to vCard and vCalendar format, so you can use other apps to edit the data, including GnomeCard and GnomeCal. HEATING WITH A MINI-SPLIT? LOOKING AT COSTS & EMISSIONS Looks like a win. With the following assumpti0ns (take a look at the spreadheet to alter them): 82 AFUE boiler, $0.71/therm natural gas, $0.10/kWh electricity, a 12 HSPF heat pump, and 1161 lbs CO2 per MWh, it looks about break-even on operating costs, but about a 30% reduction in CO2. Of course things like energy costs and carbon intensity vary by region; for carbon intensity numbers for your NEPTUNE RF WATER METER FREQUENCY HOPPING PATTERN Neptune RF water meter frequency hopping pattern. A couple of years ago, my water utility installed new remote-read water meters, Neptune e-Coder R900i, in every home in their service area. As any casual reader of this blog knows, I’m a big fan of measuring and data whenit
RETURN OF THE LOW-POWER SERVER: A 10W, 6.5 TERABYTE If you run a server 24/7 at home, that always-on power consumption can really add up. If you have an old beast running at 250W, that’s using about 2MWh of power per year, and will cost you over $200/year in electricity at $0.10/kWh. A 10W build uses only 4% of that! Here’s how I put it together: Jetway NF9W quad-core Celeron N2930 USING A WIFI THERMOSTAT API The API describes a JSON interface to the thermostat, so you can retrieve or send information using http. For example: We can get current temperature, set point, mode (heating, cooling, or off), humidity (on some models) etc. And it’s not just a read-only interface; you can set parameters like target temp, schedules, etc, aswell as display
ENPHASE SOLAR MICROINVERTER CLIPPING ANALYSIS Enphase Solar Microinverter Clipping Analysis. Posted on May 25, 2013 by Eric Sandeen. I wanted to look at how much the “clipping” behavior of power-limited solar microinverters affected my annual energy production. The TL;DR version is: at worst, THERMS PER HEATING DEGREE DAY Therms per Heating Degree Day. Posted on December 21, 2011 by Eric Sandeen. Click for interactive graph. In an earlier post I had tried out a few ways to figure out if our energy-saving efforts with respect to natural gas use were paying off; I did a few bar graphs of therms per day, per heating degree day, rolling yearly averages, etc. 2012 NISSAN LEAF BATTERY DEATHWATCH 2012 Nissan LEAF battery deathwatch. First of all – I think EVs are great. They are the future of personal transportation. But this is the story of a first-gen EV battery with some issues. I bought a used 2012 Nissan LEAF with about 38k miles for a great price – in part because it started life as a leased car in Texas, and the earlyGNUMICR - SANDEEN
MICR printing is a very tricky business, and it requires a very good printer and magnetic (MICR) toner to do it properly. Any problems with this font may result in a high (possibly 100%) reject rate from your bank, and they may charge you for this. However, by developing this font in an open manner, I hope to be able to develop the best Type 1 MONITORING A TRIANGLE TUBE PRESTIGE SOLO BOILER WITH MODBUS Get a Triangle Tube Prestige boiler with ModBus interface (Other models may work too) Get a cheap USB to RS-485 adapter like this one from Amazon. Wire it to your boiler's ModBus connections (AA, BB) Plug it into a low-power Linux computer like Raspberry Pi. Set your boiler to ModBus Address 1. Test it with this little program. ERIC'S LAME HOMEPAGE Samsung Phone Sync - SamBru. SamBru (Samsung Backup and Restore Utility) is a fairly simple Perl script that will read and write the phone list, calendar, and todo list in Samsung SCH-6100 and SCH-8500 phones. It can save to vCard and vCalendar format, so you can use other apps to edit the data, including GnomeCard and GnomeCal. HEATING WITH A MINI-SPLIT? LOOKING AT COSTS & EMISSIONS Looks like a win. With the following assumpti0ns (take a look at the spreadheet to alter them): 82 AFUE boiler, $0.71/therm natural gas, $0.10/kWh electricity, a 12 HSPF heat pump, and 1161 lbs CO2 per MWh, it looks about break-even on operating costs, but about a 30% reduction in CO2. Of course things like energy costs and carbon intensity vary by region; for carbon intensity numbers for your NEPTUNE RF WATER METER FREQUENCY HOPPING PATTERN Neptune RF water meter frequency hopping pattern. A couple of years ago, my water utility installed new remote-read water meters, Neptune e-Coder R900i, in every home in their service area. As any casual reader of this blog knows, I’m a big fan of measuring and data whenit
RETURN OF THE LOW-POWER SERVER: A 10W, 6.5 TERABYTE If you run a server 24/7 at home, that always-on power consumption can really add up. If you have an old beast running at 250W, that’s using about 2MWh of power per year, and will cost you over $200/year in electricity at $0.10/kWh. A 10W build uses only 4% of that! Here’s how I put it together: Jetway NF9W quad-core Celeron N2930 USING A WIFI THERMOSTAT API The API describes a JSON interface to the thermostat, so you can retrieve or send information using http. For example: We can get current temperature, set point, mode (heating, cooling, or off), humidity (on some models) etc. And it’s not just a read-only interface; you can set parameters like target temp, schedules, etc, aswell as display
ENPHASE SOLAR MICROINVERTER CLIPPING ANALYSIS Enphase Solar Microinverter Clipping Analysis. Posted on May 25, 2013 by Eric Sandeen. I wanted to look at how much the “clipping” behavior of power-limited solar microinverters affected my annual energy production. The TL;DR version is: at worst, THERMS PER HEATING DEGREE DAY Therms per Heating Degree Day. Posted on December 21, 2011 by Eric Sandeen. Click for interactive graph. In an earlier post I had tried out a few ways to figure out if our energy-saving efforts with respect to natural gas use were paying off; I did a few bar graphs of therms per day, per heating degree day, rolling yearly averages, etc. 2012 NISSAN LEAF BATTERY DEATHWATCH 2012 Nissan LEAF battery deathwatch. First of all – I think EVs are great. They are the future of personal transportation. But this is the story of a first-gen EV battery with some issues. I bought a used 2012 Nissan LEAF with about 38k miles for a great price – in part because it started life as a leased car in Texas, and the earlyFREECHECK - SANDEEN
FreeCheck is a free check printing utility. You can use it to print your own checks on blank check stock , available at office supply stores and various places around the web. To do this right, you also need magnetic / MICR toner to print the MICR line at the bottom of the check.ABOUT ERIC’S BLOG
About Eric’s Blog. I’m employed as a programmer, currently hacking local Linux filesystems at Red Hat, but this blog tends to be mostly energy-related, which is a side-passion of mine. You can reach me at: clickhere @sandeen.net. Note: I’ve recently started using affiliate links on some of the products I THERMS VS. HEATING DEGREE DAYS, 65F BASE Therms vs. heating Degree Days, 65F Base. click legend labels to toggle data sets on or off. This is a scatterplot of therms used vs. heating degree days for severalERIC'S BLOG
The LeafSPY stats on the new battery actually dropped fairly quickly after I got it which was worrisome, but now (in the very cold weather) it’s holding steady at about 97% state of health, with 62.3Ahr and 90.35Hx. The stats when it finally dropped the 9th bar were: Miles: 40623 Ahr: 43.51 Hx: 45.25. RESIDENTIAL BOILER MONITORING VIA MODBUS Per the boiler docs, the ModBus interface is Modbus/RTU using RS-485 for the physical layer. First thing, obviously, is to find an RS-485 adapter. Fortunately, I found one super cheap (under $10) at Amazon, a “ Kedsum USB to RS485 Converter ” and despite the cheap price and appearance, it seems to work just fine: The adapter only has TURTLE BEACH AUDIO ADVANTAGE MICRO / CM-102 GUTS Turtle Beach Audio Advantage Micro / C-Media CM-102. Works fine by default w/ the usb-audio linux driver with normal analog output. It's USB vendor:product 0x0d8C:0x0001, which indicates a HOW IS THE TACO SMARTPLUS RECIRC PUMP WORKING IN MY HOUSE The Taco SmartPlus hot water recirculation pump is designed to push domestic hot water around a recirculation loop, so that hot water is at the taps when you want it, saving time as well as water down the drain while you wait. It’s designed to learn your schedule, to avoid energy losses associated with pumps that run 24 hours a day, due to both the electrical energy used, and the lost heat I GAVE IN: MINI-SPLIT A/C A Hot Summer. 2012 was a hot one. We’ve had at least 31 days over 90F, something which hasn’t happened since 1988, and July 2012 was the second warmest July on record in the Twin Cities. This is a departure from the norm; for example the average number of 90F days is13 –
SPINNING DOWN A WD20EARS “GREEN” DRIVE With the drives spinning, the server used more like 30W. Mostly through trial and error, I found out that if you set a lower spindown timeout, i.e. hdparm -S 3, the drive will spin down in 10 minutes. So unlike most drives which follow the timeouts as specified in the hdparm manpage, this one seems to spin down in 10 minutes for low -Svalues
PSEUDO-RIGHTEOUSNESS Pseudo-righteousness. Posted on March 22, 2010 by Eric Sandeen. Wow. So Stephen Colbert interviewed Mary Matalin the other day. He heads right in, spots the cross she’s wearing, and says, riffing on Glen Beck: Colbert: “Now why are you wearing a cross you know Jesus preached Social Justice – it makes you look like a Commie.”.GNUMICR - SANDEEN
MICR printing is a very tricky business, and it requires a very good printer and magnetic (MICR) toner to do it properly. Any problems with this font may result in a high (possibly 100%) reject rate from your bank, and they may charge you for this. However, by developing this font in an open manner, I hope to be able to develop the best Type 1 ERIC'S LAME HOMEPAGE Samsung Phone Sync - SamBru. SamBru (Samsung Backup and Restore Utility) is a fairly simple Perl script that will read and write the phone list, calendar, and todo list in Samsung SCH-6100 and SCH-8500 phones. It can save to vCard and vCalendar format, so you can use other apps to edit the data, including GnomeCard and GnomeCal. HEATING WITH A MINI-SPLIT? LOOKING AT COSTS & EMISSIONS Looks like a win. With the following assumpti0ns (take a look at the spreadheet to alter them): 82 AFUE boiler, $0.71/therm natural gas, $0.10/kWh electricity, a 12 HSPF heat pump, and 1161 lbs CO2 per MWh, it looks about break-even on operating costs, but about a 30% reduction in CO2. Of course things like energy costs and carbon intensity vary by region; for carbon intensity numbers for your THERMS VS. HEATING DEGREE DAYS, 65F BASE Therms vs. heating Degree Days, 65F Base. click legend labels to toggle data sets on or off. This is a scatterplot of therms used vs. heating degree days for several NEPTUNE RF WATER METER FREQUENCY HOPPING PATTERN Neptune RF water meter frequency hopping pattern. A couple of years ago, my water utility installed new remote-read water meters, Neptune e-Coder R900i, in every home in their service area. As any casual reader of this blog knows, I’m a big fan of measuring and data whenit
RETURN OF THE LOW-POWER SERVER: A 10W, 6.5 TERABYTELOW POWER HOME SERVERLOW POWER CONSUMPTION SERVERLOW POWER HOME SERVER 2020LOW POWER WINDOWS SERVERLOW POWER MEDIA SERVERLOW POWER PLEX SERVER BUILD If you run a server 24/7 at home, that always-on power consumption can really add up. If you have an old beast running at 250W, that’s using about 2MWh of power per year, and will cost you over $200/year in electricity at $0.10/kWh. A 10W build uses only 4% of that! Here’s how I put it together: Jetway NF9W quad-core Celeron N2930 THERMS PER HEATING DEGREE DAY Therms per Heating Degree Day. Posted on December 21, 2011 by Eric Sandeen. Click for interactive graph. In an earlier post I had tried out a few ways to figure out if our energy-saving efforts with respect to natural gas use were paying off; I did a few bar graphs of therms per day, per heating degree day, rolling yearly averages, etc. TURTLE BEACH AUDIO ADVANTAGE MICRO / CM-102 GUTSTURTLE BEACH AUDIO ADVANTAGE DRIVERAUDIO ADVANTAGE MICRO 2AUDIO ADVANTAGE MICRO IITURTLE BEACH MICRO IITURTLE BEACH 3 5MM TO USBTURTLE BEACH EXTERNAL SOUNDCARD
Turtle Beach Audio Advantage Micro / C-Media CM-102. Works fine by default w/ the usb-audio linux driver with normal analog output. It's USB vendor:product 0x0d8C:0x0001, which indicates a 2012 NISSAN LEAF BATTERY DEATHWATCH 2012 Nissan LEAF battery deathwatch. First of all – I think EVs are great. They are the future of personal transportation. But this is the story of a first-gen EV battery with some issues. I bought a used 2012 Nissan LEAF with about 38k miles for a great price – in part because it started life as a leased car in Texas, and the early PSEUDO-RIGHTEOUSNESS Pseudo-righteousness. Posted on March 22, 2010 by Eric Sandeen. Wow. So Stephen Colbert interviewed Mary Matalin the other day. He heads right in, spots the cross she’s wearing, and says, riffing on Glen Beck: Colbert: “Now why are you wearing a cross you know Jesus preached Social Justice – it makes you look like a Commie.”.GNUMICR - SANDEEN
MICR printing is a very tricky business, and it requires a very good printer and magnetic (MICR) toner to do it properly. Any problems with this font may result in a high (possibly 100%) reject rate from your bank, and they may charge you for this. However, by developing this font in an open manner, I hope to be able to develop the best Type 1 ERIC'S LAME HOMEPAGE Samsung Phone Sync - SamBru. SamBru (Samsung Backup and Restore Utility) is a fairly simple Perl script that will read and write the phone list, calendar, and todo list in Samsung SCH-6100 and SCH-8500 phones. It can save to vCard and vCalendar format, so you can use other apps to edit the data, including GnomeCard and GnomeCal. HEATING WITH A MINI-SPLIT? LOOKING AT COSTS & EMISSIONS Looks like a win. With the following assumpti0ns (take a look at the spreadheet to alter them): 82 AFUE boiler, $0.71/therm natural gas, $0.10/kWh electricity, a 12 HSPF heat pump, and 1161 lbs CO2 per MWh, it looks about break-even on operating costs, but about a 30% reduction in CO2. Of course things like energy costs and carbon intensity vary by region; for carbon intensity numbers for your THERMS VS. HEATING DEGREE DAYS, 65F BASE Therms vs. heating Degree Days, 65F Base. click legend labels to toggle data sets on or off. This is a scatterplot of therms used vs. heating degree days for several NEPTUNE RF WATER METER FREQUENCY HOPPING PATTERN Neptune RF water meter frequency hopping pattern. A couple of years ago, my water utility installed new remote-read water meters, Neptune e-Coder R900i, in every home in their service area. As any casual reader of this blog knows, I’m a big fan of measuring and data whenit
RETURN OF THE LOW-POWER SERVER: A 10W, 6.5 TERABYTELOW POWER HOME SERVERLOW POWER CONSUMPTION SERVERLOW POWER HOME SERVER 2020LOW POWER WINDOWS SERVERLOW POWER MEDIA SERVERLOW POWER PLEX SERVER BUILD If you run a server 24/7 at home, that always-on power consumption can really add up. If you have an old beast running at 250W, that’s using about 2MWh of power per year, and will cost you over $200/year in electricity at $0.10/kWh. A 10W build uses only 4% of that! Here’s how I put it together: Jetway NF9W quad-core Celeron N2930 THERMS PER HEATING DEGREE DAY Therms per Heating Degree Day. Posted on December 21, 2011 by Eric Sandeen. Click for interactive graph. In an earlier post I had tried out a few ways to figure out if our energy-saving efforts with respect to natural gas use were paying off; I did a few bar graphs of therms per day, per heating degree day, rolling yearly averages, etc. TURTLE BEACH AUDIO ADVANTAGE MICRO / CM-102 GUTSTURTLE BEACH AUDIO ADVANTAGE DRIVERAUDIO ADVANTAGE MICRO 2AUDIO ADVANTAGE MICRO IITURTLE BEACH MICRO IITURTLE BEACH 3 5MM TO USBTURTLE BEACH EXTERNAL SOUNDCARD
Turtle Beach Audio Advantage Micro / C-Media CM-102. Works fine by default w/ the usb-audio linux driver with normal analog output. It's USB vendor:product 0x0d8C:0x0001, which indicates a 2012 NISSAN LEAF BATTERY DEATHWATCH 2012 Nissan LEAF battery deathwatch. First of all – I think EVs are great. They are the future of personal transportation. But this is the story of a first-gen EV battery with some issues. I bought a used 2012 Nissan LEAF with about 38k miles for a great price – in part because it started life as a leased car in Texas, and the early PSEUDO-RIGHTEOUSNESS Pseudo-righteousness. Posted on March 22, 2010 by Eric Sandeen. Wow. So Stephen Colbert interviewed Mary Matalin the other day. He heads right in, spots the cross she’s wearing, and says, riffing on Glen Beck: Colbert: “Now why are you wearing a cross you know Jesus preached Social Justice – it makes you look like a Commie.”.ERIC'S BLOG
The LeafSPY stats on the new battery actually dropped fairly quickly after I got it which was worrisome, but now (in the very cold weather) it’s holding steady at about 97% state of health, with 62.3Ahr and 90.35Hx. The stats when it finally dropped the 9th bar were: Miles: 40623 Ahr: 43.51 Hx: 45.25.FREECHECK - SANDEEN
FreeCheck is a free check printing utility. You can use it to print your own checks on blank check stock , available at office supply stores and various places around the web. To do this right, you also need magnetic / MICR toner to print the MICR line at the bottom of the check. THE PERFECT PORCHLIGHT? Most importantly, it’s instant-on, even in the cold. At 8.6W, it’s 14% of the power draw of a 60W bulb. You could almost leave it on all night, and not feel too bad about it. Porch lights are often left on for a long time; sometimes essentially forever. A 60W bulb burning 24/7 uses 44kWh/month; burning 12h a day uses 22kWh/month.MISCELLANEOUS GUNK
Misc. Stuff that I figure should be in Google's cache in case anyone is looking In college, I played in a band called Big Chief Mohasky. If I misspell it as Big Chief Mohaskey I get my very own Googlewhack.(Here's a bizarre one if you search for "passat wheel" on images.google.com, then my wheel is the first hit.Wonders never cease.UNCATEGORIZED
The Minnesota Renewable Energy Society was hosting a screening of Carbon Nation tonight at the Bell Museum of Natural History in Minneapolis. They also had tours of the University’s entry in the Solar Decathlon contest, a pretty neat little house.. Overall the movie was pretty good; supposed to be about climate solutions but I couldn’t help feeling a fair bit of despair. PSEUDO-RIGHTEOUSNESS Pseudo-righteousness. Posted on March 22, 2010 by Eric Sandeen. Wow. So Stephen Colbert interviewed Mary Matalin the other day. He heads right in, spots the cross she’s wearing, and says, riffing on Glen Beck: Colbert: “Now why are you wearing a cross you know Jesus preached Social Justice – it makes you look like a Commie.”. ENPHASE SOLAR MICROINVERTER CLIPPING ANALYSIS Enphase Solar Microinverter Clipping Analysis. Posted on May 25, 2013 by Eric Sandeen. I wanted to look at how much the “clipping” behavior of power-limited solar microinverters affected my annual energy production. The TL;DR version is: at worst, RESIDENTIAL BOILER MONITORING VIA MODBUS Per the boiler docs, the ModBus interface is Modbus/RTU using RS-485 for the physical layer. First thing, obviously, is to find an RS-485 adapter. Fortunately, I found one super cheap (under $10) at Amazon, a “ Kedsum USB to RS485 Converter ” and despite the cheap price and appearance, it seems to work just fine: The adapter only has I GAVE IN: MINI-SPLIT A/C A Hot Summer. 2012 was a hot one. We’ve had at least 31 days over 90F, something which hasn’t happened since 1988, and July 2012 was the second warmest July on record in the Twin Cities. This is a departure from the norm; for example the average number of 90F days is13 –
COULD WIFI THERMOSTATS COORDINATE ZONE FIRINGS? Most of the multi-zone controllers work this way. They have dumbish thermostats located within each zone that either does just temp sensing or the nicer ones do temp sensing and set point adjustment but just report back to a central controller.SANDEEN.NET
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