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Old 07-05-2022, 12:45 PM   #1
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RV Power Survey (Power of Various Devices)

I measured power at the wall feeding the RV when running various devices to see the power various devices use. The results are in two .pdf attachments. The first shows the power of various devices (lights, TV, etc), the second shows detail about a 10.4V EverChill 12V refrigerator, including on time, off time, 4 defrost cycles (one is missing from the chart), and even what appears to be a boost function when I was unloading with the door open (power went to 273W momentarily).

Might be useful for someone geeky who wants to know how long they can leave things on before using up their batteries, or plan solar. Mine is a Puma toy hauler.

I've never posted attachments, so here are links in case they don't show up automagically:

https://www.irv2.com/forums/attachme...1&d=1657046598


https://www.irv2.com/forums/attachme...1&d=1657046598
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File Type: pdf Measured Power of Various Devices.pdf (36.8 KB, 20 views)
File Type: pdf Measured Power of Various Devices 3.pdf (87.8 KB, 15 views)
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Old 07-05-2022, 06:54 PM   #2
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It is good that you measured actual current draws for each of your appliances. The numerous online charts don't seem to include how the figures are obtained and climatic conditions at the time; so I assume they simply read appliance data-plates. Also most do not include starting amp-draw, only running amps/watts.
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Old 07-06-2022, 09:58 AM   #3
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When people ask me how much solar they should have, I always tell them to figure out how much power they use (or would use if they could.)

So your data is a useful tool!
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Old 07-12-2022, 05:17 AM   #4
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What did you use to measure the power. I tried a Kill A Watt meter but the microwave fried it.
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Old 07-25-2022, 05:49 PM   #5
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Quote:
Originally Posted by cruizerEd View Post
What did you use to measure the power. I tried a Kill A Watt meter but the microwave fried it.
I used this one: https://a.co/d/3YskwXf

It blinks above 1500W but survived some measurements to 1800W. $17.99 Still works!

They also make one rated for 2000W, https://a.co/d/2tVDGK4 , I haven't tried that. But so far, I'm impressed with the lower power one I bought. If I knew I was going to test an AC unit, I would have bought the 2000W one.
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Old 07-26-2022, 05:55 AM   #6
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Thank you for the link. I'll put it on my wish list.
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Old 08-02-2022, 02:33 PM   #7
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Quote:
Originally Posted by Bobby F View Post
When people ask me how much solar they should have, I always tell them to figure out how much power they use (or would use if they could.)

So your data is a useful tool!

I don't know all of my numbers , but I know my microwave draws over 1600 watts, as does my 15k btu heat pump. My large residential refrigerator draws about 130 watts when running. My 13.5btu AC is similar to the OP.

So those numbers are interesting, but your actual power will vary.

Instead first installing a shunt based battery monitor, and spending some time boondocking will give you a much better picture of what your actual power usage is.
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Old 08-02-2022, 11:41 PM   #8
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These are my loads. I've tweaked this table over the years when it didn't match my actual usage. It's from a spreadsheet that determines needed solar and battery capacity given camping location, camping time of the year, and RV loads.

This is the summer half of the table. The loads in it are not the total load.
12V fridge and A/C use are treated separately in the spreadsheet (run time is a function of ambient temperature and thermostat setting). There's also a winter table. The winter table does not include the space heater because it's treated separately (run time is a function of ambient temperature and thermostat setting). Etc.

Note that the "day" loads are those that will be covered directly by solar. The "night" loads are those that will draw from the battery.

The spreadsheet is available here ....... https://diysolarforum.com/resources/...ther-data.154/

Click image for larger version

Name:	RV Loads 2.JPG
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