Energy usage log

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cmonkey
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Re: Energy usage log

Post by cmonkey » Mon Nov 28, 2016 6:20 pm

Damn! I thought I had found an easy to fix energy sink. It's only 1.5 Watts, not 1.5 amps. I have never seen a device label with watts.

The fish have their bubbles back. :?

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cmonkey
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Re: Energy usage log

Post by cmonkey » Fri Dec 02, 2016 11:05 am

I have the Kill-A-Watt and spent a fun hour or two logging some stuff. Some surprises!

Fridge - Compressor runs at 130-150 watts. The lights run at 50 watt each so max is 250 watts for the whole unit. This was the biggest surprise! Over 12 hours it used .56 KWH. I'm going to let it log for 10 days and multiply by 3 to get my monthly usage. Why is this thing rated for 7.5 amps? I have it on 5 of 10 setting, so maybe I'll turn it up and see.

Aquarium - 10 watts total, including lights.

Automatic chicken door - .5 watts open, 1.1 watts closed

Christmas lights - 30 watts per string. We have 5.

Nightlight (incandescent) - 7 watts

Home theater system (27 inch tv, old dvd player and a 15 year old surround system) - 90 watts for everything

Vintage video game center - 35 watts for the old CRT tv and 8 watts for the SNES

Coffee maker - 900 watts for ~4-5 minutes. Based on this I will use 1 KWH every 17 pots of coffee. Usually only make a max of 2 per day so looking at ~4 KWH monthly.

Toaster - 750 watts per side. We almost never use it though.

Kitchenaid mixer - 160 watts on high, 30 watts on low

Electric can open (don't ask me why we have this) - 60 watts. Again, we never use this much.




Clearly I am not finding any energy sinks so I'll keep looking. My next targets are the microwave and computer. I suspect using our stove accounts for at least half of usage.

jacob
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Re: Energy usage log

Post by jacob » Fri Dec 02, 2016 11:17 am

@cmonkey - I'm guessing it's the starting current/spike of the compressor. You can make toast on a frying pan (no oil) if you want to get rid of the toaster.

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jennypenny
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Re: Energy usage log

Post by jennypenny » Fri Dec 02, 2016 11:27 am

cmonkey wrote:I have the Kill-A-Watt and spent a fun hour or two logging some stuff. Some surprises!
It's fun to play with, isn't it? My next target is the Christmas tree. If it's too much, I'm going to try putting solar lights on the tree since we set it up in the sunroom. They should get enough of a charge to light up the tree for a few hours at night. I keep solar lanterns in that room to use around the house at night, and they last until bedtime.

For toast alternatives, see avatar. :D

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cmonkey
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Re: Energy usage log

Post by cmonkey » Fri Dec 02, 2016 11:40 am

@jacob, good idea. The burner uses at least 1200 watts which is more than the toaster, but we'd have counter space. It'll have to go through committee approval first. ;)

@JP, yes is it super fun! DW is more relieved than annoyed by this round of eccentricity actually because now I'm not complaining about the Christmas lights and the fridge anymore.

I have also had my eye on this as well, so I can monitor the large circuits. :D A good example.

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jennypenny
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Re: Energy usage log

Post by jennypenny » Fri Dec 02, 2016 11:53 am

Ha, that last one looks like Scott2's budget diagram from the other thread.

I've also been looking at switching to a 'green' electric supplier who advertises that they rely solely on wind power. I haven't done much research yet, but assuming it's what they advertise, I might be more comfortable with that if we don't install solar this year.

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cmonkey
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Re: Energy usage log

Post by cmonkey » Fri Dec 02, 2016 12:00 pm

Actually that last one wasn't the one I was looking for. This one has the most detailed electric usage I've found.

There are ways to monitor any circuit, although this site is more directed toward folks with geo systems, which is how I found it in the first place. I'd like to have one on each circuit, or at least anything over 20 amps.

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cmonkey
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Re: Energy usage log

Post by cmonkey » Mon Dec 05, 2016 12:23 pm

jennypenny wrote:My PC (on an average of 16 hours/day) is over $60/month. :shock:

I have been testing our desktop and it is running at about 110 watts sitting idle (30 watts for LCD screen and 80 watts for the tower). Under full load it goes to about 200 watts. Our power supply is 600 watts capable, so that tells me that the internals are undersized. When it goes to sleep (10-20 minutes of idle) it consumes 10 watts. Daily kWh are looking to be similar to the fridge, so perhaps $3-$5/month to run.

To get this high of power usage, do you have an Alienware/gaming rig?? Are you processing SETI?


Also, after 3 days of monitoring the fridge, usage was the same. About 1.33 kWh/day so I am paying $3-$4 per month to run my full sized fridge. No justification to get a mini at this point. DW is pleased.


I am fairly sure the 80/20 rule can account for our bill at this point as its two big things taking up most of our bill (stove & water heater). Our water heater is 5500 watt and runs for 1-2 hours daily, which accounts for most of our non-HVAC usage. I am going to turn down the thermostat from 140F.

I can tackle the water heater by hooking up the desuperheater on our geo system. When it runs in the winter and summer, it is supposed to reduce our hot water bill by over 85%. I bought a small tank for it right after we got the geo system, but I never installed it so that's on the radar to do soon.

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Chris
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Re: Energy usage log

Post by Chris » Mon Dec 05, 2016 6:34 pm

cmonkey wrote: I have been testing our desktop and it is running at about 110 watts sitting idle (30 watts for LCD screen and 80 watts for the tower). Under full load it goes to about 200 watts. Our power supply is 600 watts capable, so that tells me that the internals are undersized. When it goes to sleep (10-20 minutes of idle) it consumes 10 watts.
When I did my Kill-a-watt rampage some years ago, I researched a lot about PC power usage.

The power supply converts AC to DC, so there is a lot of loss there. Upgrading to an 80-plus power supply brought a significant improvement over the stock power supply I had been using. I also learned that peak efficiency is reached at certain load factors; the low-end tends to be where they are least efficient. So I actually ended up getting a smaller PSU, since I expected my future upgrades to be more miserly power consumers (and they were).

My current rig runs at 40 watts idle, 1 watt sleeping. Your idle seems high, though I don't know what your hardware is. Modern CPUs -- even fast ones -- should govern their frequency down when not working (which is most of the time). I would check your OS setting for that. Also, be sure that your CPU can really idle... you might have processing keeping the CPU running at a higher speed. Intel offers PowerTop for Linux that provides lots of useful info about identifying processes causing power consumption. I'm sure there is something similar for Windows.

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cmonkey
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Re: Energy usage log

Post by cmonkey » Fri Jan 06, 2017 5:46 pm

We got our December bill and it is a little better than last year when you look under the covers. In 2015 the average temp was 36, this year it was 25. We had some cold weather in the first half of the month.

We used about the same kWh, 1280. Well over half of that is the geo system. It uses 23 kWh/day in 20-30F degree temps, and up to 35kWh/day in 0-20F. The aux hasn't kicked on yet down to about -5. Last year it would have. So our insulating is starting pay for itself.

Prices are also half a cent cheaper this year so our bill was $8 less.


It also dawned on me how I can solve 3 cooking problems with 1 solution - our slower cooker.

1. I find cooking in the evening to be an inconvenience. I'm hungry so I just want something ready made.
2. The stove uses a lot of energy. Just 2 burners for 30 minutes would be 1.5 kWh.
3. Less DISHES!

Our slower cooker uses 260 watts on high and 162 watts on low. So we are gonna start using it several times per week.

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