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Graphs of common devices energy use. YMMV.


Supporting Member
Jul 29, 2018
Thought these might come in handy to someone..

The first is my Genie Excelerator garage door opener. 5 watts continuous, 45w when the lights are on, jumping to 220w(aka 2 amps) when the door is being opened, and only 115w(1 amp) when its closing. Note that this is on a single-wide garage door, and the Excelerator opens at double the rate of typical openers and is screw-drive, which probably also has an effect. In any case, because these loads are very short-lived and small, a garage door opener can be completely ignored for charging purposes.

The second is my Electrolux front-load washer going through a typical cycle. Other than a couple very short spikes to 1100 watts(10 amps), the longest sustained load is ~400 watts(3.5 amps). The width of the widest spike is only 5 seconds. I'd call this a 4 amp load and ignore the spikes, if I were figuring out my panel loads.

The third is a standard ~20 year old Kenmore dishwasher. It's interesting to see the various phases of operation. There's a sub-second spike to well over the circuit's breaker rating(!), followed by three sections where the pump is running, each followed by a short section where the drain pump is running(and gradually decreasing at the end of its run as the draining completes!), and finally the heater settles in at ~550 watts. I'm not sure if the heater runs during the earlier pumping sections. The blue line is watt-hours consumed overall, and it ends at almost exactly 1000wh, or in my case, $0.25 per load.

I hope someone finds this useful.


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Supporting Member
Jul 29, 2018
Do that same exercise for your air conditioner...betting that takes the cake...
I'm sure it would be a frequent 10 amps or better, but about nine years ago we switched from four window units to a three ton Carrier Greenspeed air source heat pump that takes less energy to make the entire house cool or warm and I don't have to move super-awkward window AC's to the attic and back every summer.
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