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Runnning Air Condition Units On Batteries


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Hi, 

Very new to the solar scene. So go gently please.😀

If I have 3 of the attached air condition units running simultaneously for a 9 hour period. 

At 1090W per unit, per hour, does that mean for a 9 hour period I will require 29 430W (1090W x 3unit= 3 270W x 9 hours = 29 430W) or call it 29,43kW battery storage to run these units for 9 hours straight? I do understand there is conversion loss etc that one needs to consider as well etc. but don't need the technical detail just yet.

The question is here, do I have the basic sum correct or is there a thing or two some one can teach me that I don't know about running air condition units on batteries?

Thanks

 

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On 2021/01/08 at 11:52 PM, Inquisitive Solar said:

At 1090W per unit, per hour,

No, these air conditioners will be using 1090 W any time that they are running. It's not like you'll need 2180 W after 2 hours.

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does that mean for a 9 hour period I will require 29 430W (1090W x 3unit= 3 270W x 9 hours = 29 430W) 

Nearly correct; you need 3 270W x 9 hours = 29 430Wh.

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or call it 29,43kW battery storage to run these units for 9 hours straight?

You need 29,43 kWh of energy to run them. Since inverters typically have a 7-10% loss, you'll need 7-10% more than that energy from your battery.

You'll need more than a 30 kWh battery to run them flat out without any solar power, because you can't regularly use all of a battery's rated capacity. You can use about 80% of an LFP battery's rated capacity, or ~50% of a lead-acid battery's rated capacity, when new. But as Richard has pointed out, if it's raining or cloudy, you likely don't need as much air conditioning (they will cycle off more), so you'll likely be able to get away with a considerably smaller battery. That's a good thing, because 30 kWh of battery is non-trivial.

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