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Old 08-09-2017, 06:41 AM   #1
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Running AC off grid ??

What kind of AC and how big is my battery bank/solar panels to run AC for at least 3 hours?
Thank you so much.
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Old 08-09-2017, 07:36 AM   #2
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Trying to finalize my power needs for my family's upcoming build and I, too, am heavily interested in this topic. Spent all day yesterday trying to learn what I don't know. Only ended up more dazed and confused... xD

So yeah, if anyone has some great resources, please do share!
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Old 08-09-2017, 07:39 AM   #3
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How much AC is needed?

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Old 08-09-2017, 07:42 AM   #4
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Minimum AC wattage consumption available. Is it the mini split?
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Old 08-09-2017, 07:44 AM   #5
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Square feet to be cooled?

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Air conditioning but calculator
http://www.calculator.net/btu-calculator.html
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Old 08-09-2017, 08:05 AM   #6
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Originally Posted by Tootalltechie View Post
Square feet to be cooled?

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Air conditioning but calculator
BTU Calculator
For me, it's about 200sqft, if that. We need the setup to run the AC for 3-5 hours midday two or three times a week, but still last about 7 hours overnight throughout the week. I'm looking at about 2000w of solar on the roof and I live in Florida, so plenty of sun... xD

Not sure if this is enough information to work with, so sorry if that's the case!
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Old 08-09-2017, 08:08 AM   #7
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Originally Posted by willvalenton View Post
Minimum AC wattage consumption available. Is it the mini split?
Hmm... I don't think so. I'm looking up some of the lower end mini splits now and I think that's higher than a window unit we're looking at. I'll get the information and let you know!
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Old 08-09-2017, 08:16 AM   #8
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Originally Posted by willvalenton View Post
Minimum AC wattage consumption available. Is it the mini split?
Here ya go. Pretty close between the two, actually.

https://www.amazon.com/Pioneer-Air-C...plit%2Bac&th=1

That unit pulls about 782w (292 to 1087 min/max).

The window unit I was looking at is this:

https://www.amazon.com/Frigidaire-FG...ir+conditioner

This unit pulls about 665w.
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Old 08-09-2017, 08:57 AM   #9
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Join Date: Jul 2016
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Chassis: CHEVROLET C60 just under 19700 lbs body#B10353
Engine: 350 ci on propane
Rated Cap: 48
Quote:
Originally Posted by Tropf View Post
For me, it's about 200sqft, if that. We need the setup to run the AC for 3-5 hours midday two or three times a week, but still last about 7 hours overnight throughout the week. I'm looking at about 2000w of solar on the roof and I live in Florida, so plenty of sun... xD

Not sure if this is enough information to work with, so sorry if that's the case!
That would be my guess too.
2000 watt divided by 12 volt equals about 170 amp hour. 170 x 3 hrs = 510 amp hour of run time. You don't want your battery bank to run down to 50% so multiply the 510 by 3 you get a battery bank of 1500+ amp hour.

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EDIT
I think that it would give you a run time of about 4 hrs. If you were using a 1800 watt AC unit at full blast.
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Old 08-09-2017, 09:03 AM   #10
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Originally Posted by Tootalltechie View Post
That would be my guess too.
2000 watt divided by 12 volt equals about 170 amp hour. 170 x 3 hrs = 510 amp hour of run time. You don't want your battery bank to run down to 50% so multiply the 510 by 3 you get a battery bank of 1500+ amp hour.

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Hah. I knew I was leaving something important out. I'm debating a 24v or 48v system because there's two of us, we own an educational video game company so technology is always prevalent, and we're going to have our two shepherds with us.

The other piece of information I left out is I'm looking at using lithium phosphate batteries. I assume I can still follow your formula, just swap voltage based on the system I decide on and account for the additional utilization of the lithium?

EDIT: I put this information in another post, but it's being reviewed by mods I guess... I intend on using a frigidaire window unit that uses around 665w when cooling.
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