Archive for the 'Solar' Category

Our new energy monitor

Photo of eGauge in box

The setup

As you can see in the photo above, we have 2 new eGauges. Each monitors up to 12 circuits, for a total of 24. When you count 2 lines in, solar and several circuits that have double breakers pulling unbalanced loads, that ends up covering 20 individual things we can now monitor. We were previously monitoring only 7 circuits plus solar and power from the utility.

We’re now monitoring the kitchen refrigerator, basement freezer, ventilator, ventilator pre-heat, barn, the backup electric resistance units in the bedrooms and living room, and a bunch of other circuits including the one we charge our plug-in hybrid.

We chose the EG3000 model without the HomePlug AV. Our router is very near the electric panel in the basement so it was easy to wire it directly using ethernet cables. The ethernet model requires a separate enclosure. You can’t put it in the panel box. This is fine because there is isn’t much room in the panel box, especially after you install 24 CTs and a load of twisted spaghetti wire (see above). My electrician installed this small box next to the panel with all the wires running through conduits. I’m going to cut a piece of clear plexi to fit over the box so you can still see everything inside, but keep the dust out.

The install

The eGauge install was fairly similar to the eMonitor. You need to power the monitor devices directly from the breakers in the panel box, and you need to keep track of which lines you are monitoring. My electrician figured it quite easily, although he installed all the current transformers (CTs) in the opposite direction. Thankfully this doesn’t really matter as long as you are consistent in the direction you install them.

The cost

The 2 eGauge units plus the CTs and shipping worked out to $1,282. Our electrician charged us about $400 for the physical install. I did the configuration and spent several hours messing with the settings to get everything working correctly. The documentation is not great, but I figured most of it out. Having some prior experience with an energy monitor (we’re now on our third) definitely helped.

I don’t remember how much we paid for the eMonitor 2 years ago. I seem to recall in the $600 range for the 12 circuit wifi model, plus another $400 for install. It looks like you can now get a 24 circuit ethernet connected model for $700 plus the 2 year subscription fee, which for us was about $180.

So why did we switch?

1. No yearly licensing cost

I absolutely enjoyed the data that came out of our eMonitor (see our post 2 years ago), but I deplored their architecture and business model which required me to pay a subscription fee every two years to have access to my data on their servers.

eGauge has no licensing fees and stores its data right on the box, at 1 minutes resolution for the first year and 15 minute resolution after that up to 30 years.

2. Data quality

I’ve been tinkering with some new analysis techniques that required minute resolution data. So I downloaded 2 years worth of minute data from my eMonitor. This was not a pleasant experience since they only allow you to download 2 weeks of data at a time, the data files are large. Then I proceeded to look at the data and try to recreate the hourly data from the minute data. This should be an easy exercise, but I found that there were lots of little gaps in the data. I was not able to fully recreate the hourly data I had originally downloaded. After numerous emails with their service desk, they stopped responding.  I don’t think they could explain the gaps. I don’t know if the problem was hardware, or data was lost in translation, but it didn’t give me a lot of confidence in the device or service.

I spoke about this issue with a few people at the Better Building by Design conference in Burlington, VT back in February. The Efficiency Vermont booth was demonstrating some energy monitoring case studies and had good things to say about the eGauge. I have a huge amount of respect for the Efficiency Vermont organization. Lots of smart folks there.

3. Make-ability

I enjoy building stuff and tinkering with different ways of analyzing and visualizing our energy usage.

With the eMonitor, I downloaded our data from their servers once a month. It wasn’t easy enough to do in any shorter increments and I wasn’t going to apply for a developer license to access their databases directly.

Since the eGauge data is on the box in my basement*, I can access realtime data through the built in web interface or through a simple API. This is awesome for makers. I’m looking forward to building a new realtime interface to view our energy data.

*Since the data is on the box in my basement, I’m setting up an automatic backup.

4. Customizable

the eMonitor may be different now, but when I bought it 2 years ago, it came as a kit to monitor several different sized loads. We ended up not using one of the monitoring slots because we didn’t have a circuit I wanted to measure that matched the monitor amperage.

eGauge lets you mix and match components. I picked the number and size of the CTs and the type of monitor configuration to match my setup.

Screenshot eGauge 6hr view

That’s it, go out there and measure stuff.

2014 Zero Net Energy Building Award

poster in lobby

We won! Thanks to the Northeast Sustainable Energy Association (NESEA) for awarding us the 2014 Zero Energy Building Award at the Building Energy Conference (BE14) in Boston this week. Gina McCarthy of the EPA gave a rousing keynote, and shortly after Jill and I were called onstage to receive the award.

At the afternoon lunch panel discussion we gave a short presentation about the house along with a few other contestants including Carter Scott. It was a great crowd with good questions.

But the best part was getting to meet a few of my energy heroes.

Marc Rosenbaum

Marc Rosenbaum

Marc Rosenbaum is EnergySmiths and keeps a great blog at Thriving on Low Carbon. His name always pops up on interesting projects around New England and he knows his data, particularly when it comes to heat pumps. I’ve followed his writings and work for several years now. It was a pleasure to meet him in person.

Carter Scott

Carter Scott

I was also fortunate to meet Carter Scott of Transformations. I was still considering large masonry stoves, radiant floors and solar hot water in late 2009 when Jill and I were kicking around plans and researching different heating strategies. Then I found an article in Solar Today (2008) about a house Carter Scott was building for the Zero Energy Home Challenge in Massachusetts. This is also how I found Mike Duclos and our energy consultants, DEAP Energy Group. These houses featured double stud walls packed with cellulose, an air-source heat pump and solar PV. I was sold on the idea.

Selfie with Warren Coolidge

Our contractor, Warren Coolidge

And speaking of heroes, I also want to thank our contractor Warren Coolidge. He took time out of his busy schedule and made the long drive to Boston to join us at the conference. Warren listened to all my crazy energy ideas and found ways to help us build the house, and keep it on budget (most of the time).  He is a true craftsman and I very much enjoyed working with him. I don’t sell anything on this site, but if you want to build a net zero house in Washington County, New York, hire this man. You won’t be sorry.

We’ll be opening up the house again for NESEA’s Green Building Open House tour in October. See the house, the goats, chickens and turkeys. I’m sure Jill will also have some home-made cheese available. Mark your calendars and come visit us!

Fourth quarter 2013 performance

Q4 2013 summary: 10% cooler, 22% more usage and 10% more sun as compared to Q4 2012.

Now that we are starting to collect our second year of performance data, I’ll be comparing our new data to the same period last year. Year-over-year comparisons should be more illustrative than comparing to previous months. I’m also switching to a quarterly reporting period to look for larger trends, but I will continue to post data monthly at netplusdesign.com

In Q4 last year our total usage was 1,599 kWh. This year is was 1,957 kWh, a 22% increase. Despite snow covering the collectors for a few days and cloudy weather, we still produced 10% more energy in Q4.

Overall, here’s how this quarter and the year compare to 2012.

Chart comparing Q4 2012-2013 energy and temperature values

2013 Usage Solar PV Net usage
or (surplus)
Avg.
daily usage
HDD
Total 1,957 1,576 380 21.2 2,372
Oct
482 674 (192) 15.6 405
Nov
559 639 (81) 18.6 838
Dec
916 263 653 29.5 1,129
2012 Usage Solar PV Net usage
or (surplus)
Avg.
daily usage
HDD
Total 1,599 1,428 170 17.4 2,166
Oct
433 511 (79) 14.0 357
Nov
498 615 (117) 16.6 830
Dec
668 302 366 21.6 979
All values in kWh (except HDD which is base 65°F).

We used 22% more energy (358 kWh) this quarter as compared to 2012. That’s about 3.8 kWh extra per day, or 158 watt hours per day more than last year. The last two quarters we’re been running 4 to 5 kWh higher per day. Last quarter I predicted this quarter usage would also likely be up 4-5 kWh/day from Q4 2012. It looks like we stuck to the lower bound, same as last quarter.

One noticeable difference this quarter was our heat usage. Q4 2012 our air-source heat pump used 205 kWh. This quarter we used 438 kWh, a 114% increase. It was about 10% cooler than Q4 2012, but we also had 10% more sun.  It’s not really clear to me at the moment what is causing the increased usage. I’ll have to do a bit more detective work. Overall for the year we would have paid $180 to heat and cool our house, if we paid for electricity.

Chart of ASHP usage values 2012-2013

Cumulative plot of ASHP usage values for Q4 2012 and Q4 2013

Water-wise our usage is down 5%, and our hot water usage is down 13% from Q4 2012.

Year over year comparison

Looking back over 2012 and 2013, most circuits we track stay about the same over time, excluding heat. The one set of circuits that have changed a lot over the last two years are in the category of ‘all other circuits’, meaning the circuits we do not measure individually. This category counted for 43% of our overall usage in 2013. This includes plug loads, lighting and ventilation. (Ventilation is only used from late fall through mid spring.) Plug loads include the home office, the TV, stereo, refrigerator, freezer, coffee maker, incubators and heat lamps for chickens in the spring, the Prius plugin, barn lights, electric fence, water bucket warmers, etc.

Chart comparison of 'all other circuits' 2012-2013

You can see that this category has steadily grown from 100 kWh/month to peaking in April at 330 kWh/month. I’m hoping we’ve leveled off, averaging around 250 kWh/mo. We will still have a peak in the hatching season, until the chickens take over this work for us.

Happy 2014!

You can see heat maps and detailed charts of temperature and electrical usage at netplusdesign.com. View hourly, daily and monthly values for solar, usage, net usage, temperatures and HDD.

We’re net positive for 2013!

Pie chart of energy usage by circuit 2013 Stacked bar chart of energy usage by month 2013 chart of monthly temperature ranges 2013chart of temperature buckets with ASHP usage overlay 2013chart of water usage 2013

chart of grid vs solar supply mix for 2013

Solar we were able to use directly vs. solar that was sent back to the grid

Year Summary

We’re net positive for 2013! We used 7,206 kWh and generated 8,575 kWh for a net surplus of 1,368 kWh. We used an average of 19.7 kWh per day. We used 29% more energy and generated 3% less than last year. 2013 was 16% cooler than 2012. The coldest day of 2013 was Jan 3 at -7 degrees F, and the coldest day overall was Jan 24 at 60.8 HHD.

We’re 21% over our projected energy use of 5,950 kWh for the year. We used about 85% of the estimated 2,440 kWh for hot water energy. We used 26% of our heat energy estimate for the year.

Our BTU/SF/HDD is 0.425. BTU/SF/HDD is a common measure to compare the efficiency of houses of different sizes and climates. We recorded 6,810 HDD (base 65F) for 2013. The ASHP used 1195.782 kWh for heating in that period. Converting kWh to BTUs, 1195.782 kWh * 3,412.14163 (kWh to BTU conversion factor) then divide by 1408 SF and divide again by 6,810 HDD = 0.425.

We used an average of 66 gallons of water per day. 33% of our total water usage was hot water.  It takes about 264 watts to heat each gallon of hot water and 2.644 watts to pump it from the well.

That’s it for 2013. Happy 2014 everyone!

Third quarter 2013 performance

Q3 2013 summary: 36% cooler, 38% more usage and 2% less sun as compared to Q3 2012.

Now that we are starting to collect our second year of performance data, I’ll be comparing our new data to the same period last year. Year-over-year comparisons should be more illustrative than comparing to previous months. I’m also switching to a quarterly reporting period to look for larger trends, but I will continue to post data monthly at netplusdesign.com

In Q3 last year our total usage was 927 kWh. This year is was 1,283 kWh, a 38% increase. Although it feels like it had rained a lot more this year then last, we only produced 2% less energy in Q3.

Overall, here’s how this quarter and the first three quarters compare to 2012.

Q1-3 comparison

2013 Usage Solar PV Net usage
or (surplus)
Avg.
daily usage
HDD
Total 1,283 2,826 (1,544) 14.0 294
Jul
384 929 (546) 12.4 18
Aug
447 961 (514) 14.4 58
Sep
452 936 (484) 15.1 218
2012 Usage Solar PV Net usage
or (surplus)
Avg.
daily usage
HDD
Total 927 2,871 (1,944) 10.1 216
Jul
319 970 (651) 10.3 17
Aug
316 1,018 (702) 10.2 31
Sep
292 883 (591) 9.7 168
All values in kWh (except HDD which is base 65°F).

We used 38% more energy (356 kWh) this quarter as compared to 2012. That’s about  3.9 kWh extra per day, or 161 watt hours per day more than last year. The last two quarters we’re been running about 5 kWh higher. Last quarter I predicted this quarter usage would be up roughly 230 kWh from Q3 2012. It was actually up 356 kWh. I didn’t take into account the fact that we would be buying a plug-in hybrid car.

However, we used a lot less cooling this quarter. We used the ASHP for roughly 5 hours in September for a total of 3.7 kWh, a 93% reduction. Third quarter last year the ASHP used 50.6 kWh. We used the air conditioner a lot last year mainly for dehumidification because the house was still drying out and we didn’t want any buckled floors. The house seemed to cope well with the humidity this year.

That means we used roughly 403 kWh more than last year if you factor out cooling. That’s about 4.4 kWh per day. I’m using about 432 Wh per day for the home office. If the Prius is using about 3.8 kWh per day as predicted, that means there’s another 200 or so watt hours unaccounted in there per day in comparison to last year.

Our water usage is down 13%, and our hot water usage is down 12% from Q3 2012. More rain equals less watering the garden. Less barn building this summer equals less showers.

Predictions for next quarter? Will we use 4 or 5 kWh more per day than least year? Stay tuned!

You can see heat maps and detailed charts of temperature and electrical usage at netplusdesign.com. View hourly, daily and monthly values for solar, usage, net usage, temperatures and HDD.

20 Megawatt-hours

20,000 kWh meter pic

Today we generated our 20th megawatt-hour.

It took 837 days to generate 20,000 kilowatt-hours, or roughly 28 months.

Since we moved into the house January 1, 2012, we’ve generated 15.3 MWh and used 10.6 MWh.

 

Second solar anniversary

Last month marked our second solar year. We produced 8,519 kWh and used 6,410 kWh for a net of -2,110 kWh from June 2012 to June 2013.

At $0.04 / kWh that works out to a credit of $86.41 from the electric company.

That’s a 46% decrease from last year when we generated a surplus of 3,650 kWh and a credit of $159.68.

Not only did we produce less this year, we used more.

Note: with the new plug-in hybrid, we’ll be using even more of our surplus, and saving more. We’re spending roughly 13 to 19 cent’s per mile in gas.  We’re saving an estimated $400 to $600 in gas each year by using electricity (13 miles/day * $0.19 = 2.47/day * 250 days) which the electric company would only pay us about $55 (1,400 kWh * $0.04) if we sold it back as surplus.

Second quarter 2013 performance

Q2 2013 summary: 13% colder, 44% more usage and 4% less sun.

Now that we are starting to collect our second year of performance data, I’ll be comparing our new data to the same period last year. Year-over-year comparisons should be more illustrative than comparing to previous months. I’m also switching to a quarterly reporting period to look for larger trends, but I will continue to post data monthly at netplusdesign.com

In Q2 last year our total usage was 1,021 kWh. This year is was 1,468 kWh, a 44% increase. Although it feels like it had rained a lot more this year then last, we only produced 4% less energy in Q2.

Overall, here’s how the first and second quarters compare to 2012.

Q1 and Q2 comparison

2013 Usage Solar PV Net usage
or (surplus)
Avg.
daily usage
HDD
Total 1,468 2,626 (1,158) 16.1 906
Apr
528 920 (392) 17.6 571
May
529 904 (375) 17.1 232
Jun
411 802 (391) 13.7 103
2012 Usage Solar PV Net usage
or (surplus)
Avg.
daily usage
HDD
Total 1,021 2,731 (1,709) 11.2 802
Apr
387 925 (538) 12.9 535
May
309 867 (557) 10.0 170
Jun
325 939 (614) 10.8 97
All values in kWh (except HDD which is base 65°F).

Interesting note, we used 44% more energy this quarter as compared to 2012, but that was 447 kWh, or about the same as last quarter. We’re consistently using about  5 kWh extra per day than last year. This breaks down to 208 extra watts per hour. 100 watts is a heat lamp for the chick brooder, and the other 108 watts is roughly what my 2 laptops and task lighting use on average per hour.

Our water usage is only up 12%, and our hot water usage is down 3% from Q2 2012.

As for heating, we used the ASHP for roughly 14 hours in April for a total of 7.5 kWh.

In summary, Q2 usage is up compared to last year. That increase is attributed partially to the incubator and brooder box heat lamp (for the turkeys, chickens and guinea fowl), and partially to the increased use of the home office (last year I spent most of the summer building a barn, not staring at computers). We should be retiring the brooder box heat lamp this month, so I predict our next quarter usage will be up roughly 230 kWh from Q3 2012. Let’s see if my prediction holds.

You can see heat maps and detailed charts of temperature and electrical usage at netplusdesign.com. View hourly, daily and monthly values for solar, usage, net usage, temperatures and HDD.

First quarter 2013 performance

Q1 2013 summary: 20% more cold, 22% more usage and 15% less sun.

Now that we are starting to collect our second year of performance data, I’ll be comparing our new data to the same period last year. Year-over-year comparisons should be more illustrative than comparing to previous months. I’m also switching to a quarterly reporting period to look for larger trends, but I will continue to post data monthly at netplusdesign.com

**See April 7 Update at end of post.

In Q1 last year our net usage was 228 kWh. This year is was 953 kWh, a 300% increase! In March 2012 we actually generated a surplus, but not this year.

Overall, here’s how the first quarter compares to 2012.

q1-comparison

2013 Usage Solar PV Net usage
or (surplus)
Avg.
daily usage
HDD
Total 2,499 1,546 953 28.1 3,238
Jan
881 478 403 28.4 1,189
Feb
812 449 362 29.0 1,067
Mar
806 618 188 26.0 983
2012 Usage Solar PV Net usage
or (surplus)
Avg.
daily usage
HDD
Total 2,054 1,824 228 22.6 2,701
Jan
873 369 504 28.2 1,125
Feb
666 597 69 23.0 957
Mar
515 860 (345) 16.6 619
All values in kWh (except HDD which is base 65°F).

Seeing all the increases, I wanted to understand if our 22% increased usage (445 kWh) was due mainly to the 20% increase in colder weather (HDD), or if other factors were leading to our increased electricity usage.

Broadly speaking, hot water, heat and all other circuits (mainly plugs loads and lighting) each accounted for about 30% of the total energy for the 1st quarter. Out of the three, hot water is the only one we can accurately compare because we still lack circuit-level data for Q1 2012.

For the last three months we’ve averaged 74.8 gallons of water per day, up 46% from first quarter 2012. That’s an extra 600 to 800 gallons of water per month, or nearly 24 extra gallons per day. This includes a 25% increase in hot water usage. Although we don’t have circuit-level data on the hot water heater, we do have monthly hot water usage data. We can use this to estimate the energy required to make hot water in Q1 2012.

Our hot water heater used an average of 275.8 watts to heat one gallon of water in Q1 2013 (water heaters have to work harder in the winter). We used an extra 533 gallons of hot water in Q1 2013. 533 * 275.8 = 147 kWh. That’s 33% of the overall usage increase right there.

As for the cause of the increase? To remain happily married I will only say two words, goats and mother-in-law. I don’t think I should say anything more on that topic.

Now let’s look at heating.

Determining the increase in heat energy is not easy to answer because we only have estimated usage values for heat in Q1 2012. Estimated values for heating have a much higher degree of uncertainty. Using this quarter’s values to check the accuracy of my 2012 estimate shows that my estimate may have been off quite a bit. It’s hard to know how much it may be off because I don’t know an easy way to factor in heat gain directly from the sun shining through the windows. Below are the heat pump electric usage values for Q1 2012 and 2013.

Heat (kWh) 2012* 2013 change
Total 327 746 128%
Jan 149 282 89%
Feb 119 270 127%
Mar 59 194 229%
* 2012 values estimated (see Estimating heat energy for 2012).
All values in kWh.

Based on the values in this table, we used an additional 422 kWh or a 128% increase in energy use for heating in 2013. This would almost completely use up the 445 kWh overall usage increase! So I know this can’t be correct. For example, if I use the HDD formula, 0.2261 x 1900 HDD(base 50) + 0.756, I get 430 kWh, which is far below the actual recorded 746 kWh. Which means my estimated heat values for 2012 are off. But we know that heating has increased some amount due to the colder temperatures and cloudier skies. We just can’t determine how much it increased.

So let’s look at all other circuits. Again we can’t really compare apples-to-apples yet, but there are a number of changes that have occurred this year. As I mentioned, we now have a barn full of goats, chickens and other critters. On the coldest days we used heated water buckets to keep the water from freezing. In March we had an egg incubator running for 23 days and and we’re using grow lamps to start our garden seedlings. As of March 30 we’re also now using a 250W heat lamp in the chic brooder. This will last for a few weeks before we switch to a smaller wattage, pushing our energy usage up 4 to 5 times it’s usual base load for about 5-6 weeks. Soon the incubator will be in use again. We’re going to try hatching and raising some turkeys this year.

In summary, Q1 usage is up compared to last year. Some of the reasons for this are fairly obvious, others remain difficult to tease out of the data. Hopefully next quarter will offer better comparisons and we’ll finally be able to compare apples-to-apples with circuit-level data. It should be easier to see where usage has changed and why. If we understand why, then we have a better chance of improving performance over time.

April 7 Update: Using a different method I estimated  that heat energy most likely did increase 20%. That means out of the 445 kWh increase in 2013, 65% of that increase was due to heat energy, 33% was water heating and everything else was 2%. That sounds a little more realistic.

You can see heat maps and detailed charts of temperature and electrical usage at netplusdesign.com. View hourly, daily and monthly values for solar, usage, net usage, temperatures and HDD.

We’re net positive for 2012!

Pie chart showing circuit usage YTD

Bar chart showing circuit usage per month

Year Summary

We’re net positive for 2012! We used 5,601 kWh and generated 8,856 kWh for a net surplus of 3,256 kWh. We used an average of 15.3 kWh per day.

We’re within 6% of our projected energy use of 5,950 kWh for the year. It also looks like we used about 80% of the estimated 2,440 kWh for hot water energy. It’s too early to tell how we’re doing against our heat energy estimate since we missed recording the primary heating season. We should know better by mid-March.

But we can calculate the current BTU/SF/HDD, which is a common measure to compare the efficiency of houses of different sizes and climates. First we need to know the total heating degree days (HDD) and heat energy usage for the period we have data. We recorded 5,885 HDD (base 65F) for 2012. 3,434.800 HDD were recorded when we had circuit level data for the ASHP, which used 277.331 kWh for heating in that period.

Now we convert kWh to BTUs,  277.331 kWh * 3412.14163 (kWh to BTU conversion factor) then divide by 1408 SF and divide again by 3,434.800 HDD (March 16-Dec 31, 2012) = 0.196. This is not a completely accurate number as it does not include Jan 1 through March 15, but soon we will have a full year of circuit level data and a more representative number.

We used an average of 56 gallons of water per day. 34% of our total water usage was hot water.  For the time period we have circuit level data that works out to 258 watts per gallon of hot water. I’ve found some estimates on the web that say we should be using about half that wattage to heat our water, so we’re going to do a bit more investigation.

December Summary

In December, we used 668 kWh and generated 302 kWh for a net deficit of 366 kWh. We had nine consecutive surplus months. This is the first month since February that we used more than we generated.

We used 152 kWh for heat, a 227% increase over November. Dividing 152 kWh by 979 HDD we get 155 watts per HDD. That’s a 182% increase from November. Not only are we using the heat more, but the heat pump has to work harder because it’s colder outside. Heating accounts for 22% of the month’s total usage. Hot water accounted for 32% of the energy for the month. We used 65.9 gallons of water per day, up 7% from the previous month.

The largest energy increase in the last few months has been in the All Other category, followed by the water heater, ASHP and the stove. Most of this makes sense. We’re spending a lot more time indoors. The holidays bring visitors, more showers, more laundry and lots and lots of cooking!

We generated 302 kWh, roughly half of November’s production. It was down 24% from the estimated December value of 399 kWh. A very cloudy and snowy month. In fact we only generated 116 watts the last 5 days of the year due to snow blanketing the collectors.

Usage Solar PV Net usage or (surplus) Avg. daily usage HDD3,4
Total 5,601 8,856 (3,256) 15.3 5,885
Jan1 873 369 504 28.2 1,1255
Feb2 666 597 69 23.0 957
Mar6 515 860 (345) 16.6 619
Apr7 925 378 (538) 12.9 535
May 309 867 (558) 10.0 170
Jun 325 939 (614) 10.8 97
Jul 319 970 (651) 10.3 17
Aug 315 1,018 (703) 10.2 31
Sep 292 883 (591) 9.7 168
Oct 433 511 (78) 14.0 357
Nov 498 615 (117) 16.5 830
Dec 668 302 366 21.6 979
All values in kWh (except HDD).
1 January values based on meter reads.
2 February values based on TED data.
3 Heating Degree Days, a measure of how many outside degrees in a day it is below a base target inside temperature, 65F.
4 Calculated from our HOBO outdoor weather monitor hourly data, unless otherwise noted.
5 January HDD data downloaded from degreedays.net, Station ID: KALB (Albany International Airport).
6 March values based on meter reads. (TED died March 1st, eMonitor installed March 16, 2012)
7 Values starting in April are based on eMonitor data.

Next month we’ll start including information gathered from our two additional temperature/humidity sensors. We will now be able to see how temperatures differ from floor to floor.

You can see heat maps and detailed charts of temperature and electrical usage at netplusdesign.com. View solar, usage, net usage, temperatures and HDD for all of February and circuit-level data for 16 days in March and the full months of April through December.

Happy 2013 everyone!


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