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Old 03-06-2019, 07:10 PM   #1
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AC on solar power

Just trying to understand how this works. I'm planning on my build being all electric (if possible). How do I figure out how much solar power I will need. And is it possible to have RV roof mounted units on solar power?
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Old 03-06-2019, 07:35 PM   #2
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Possible as a technology demonstration, not practical.

Use a genset.

With a huge heavy storage bank, solar can be used to reduce its runtime.

A little.

http://www.skoolie.net/forums/f10/mi...tml#post297875
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Old 03-06-2019, 07:39 PM   #3
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No offense, but someone asks this question about once a week. The closest that Iíve actually seen anyone come to it is running a mini split unit in dehumidifier mode which is about half strength of normal air conditioning, maybe enough to cool one small room in real time off of solar.
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Old 03-06-2019, 07:56 PM   #4
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No offense taken at all. Thanks for teaching me!
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Old 03-06-2019, 08:52 PM   #5
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Some good info here. their interactive "wiring diagrams" make things easy to understand.


https://www.explorist.life/diy-campervan-solar/
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Old 03-06-2019, 09:58 PM   #6
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had actually just watched this guy before I logged in here

disregard the wind noise in the beginning
using a soft start method, several soft start modules online


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Old 03-07-2019, 05:48 AM   #7
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Note that location gives max insolation conditions.

If anyone bothers sitting through that, please post the hard data.

What unit?

How big his bank in Ah? What chemistry? How often does the bank get back to 100% Full?

How many watts of panels? Up front costs?

Size of space cooled, how many hours per day, how well insulated?

No one's saying it **can't** be done.

Just a question of practicality and cost, compared to running a small quiet genset.
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Old 03-07-2019, 01:26 PM   #8
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After watching the thing:

Air conditioner - Coleman Mach 1 Power Saver #48207C966 11,000 btu.

Soft start module - Micro-Air Easy Start #ASY-364-X30 (or X36 (blurry))

Battery - One 100AH lithium Ion L13 battery

Inverter - 2000W Go Power pure sine wave.

RV looks like a standard sticks and staples trailer.

He is in southern California in ideal conditions. His panels were putting out 13 to 17 amps while the AC was pulling about 11 running amps so the battery was just there to add a push to start the compressor then the panels would power the AC and some other small draws while throwing a few amps at the battery.

The lithium battery can be drawn down way further than lead-acid battery so he'd actually have a few hours capacity to run the AC at night.

Without the Easy start module the inverter was protesting when the AC started up but with it installed there were no warning sounds from the inverter.

So, doable technically without a huge battery bank. But that assumes good solar charging weather and no other large draws (and he still has to park in full sun). Whoda thunk it?
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Old 03-07-2019, 06:54 PM   #9
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So... Rooftop a/c off solar is possible. I do it. Just not for a long time. Mini-split also, for longer periods of time.

I have 1400 watts of panels and a 12 volt 840 ah AGM battery bank.

Climate Right 12,000 btu mini-split.

Dometic Brisk II 15,000 btu rooftop.

(Side note, we are just starting to move into the bus. Have done one 3~ hour road trip)

On a sunny day, I can run the mini split all day while the sun is up and keep 100% battery bank. Not sure about over night as the nights we slept in it have been plugged in. Left it on dehumidifier on accident the other night, 70%~ battery bank in the morning.

Rooftop we ran on our trip, plugged into the inverter, mostly on the high setting. Hit 55%~ battery discharge after about 2.5 hours. (Side note, I had too all of a wire and plug size connected to a/c and burned a couple of fuses. I have corrected that. Will see of that affects power usage tomorrow on our trip.)
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Old 03-07-2019, 06:55 PM   #10
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I'm in Central Florida
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