Help with the math please…

[BattleAxe]

Let’s say I want to run a 10,000 BTU window unit in an off grid well insulated shipping container for 2- 3 hours per day for the sole purpose of controlling humidity in the summer months. The AC unit has a start up demand of 3,000 watts and a 1,000 watts continuous. Will (1) 48v 100ah battery handle this? My next question is how many PV panels will I need to maintain the battery? I’m figuring on getting a growatt 5Kw inverter.

I’ll have a generator to run when I’m there, I’m just wanting to figure out how to climate control this camp when I’m away.

 

[rmaddy]

1000W for 3 hours is 3000Wh. But through an inverter it would be about 3500Wh.
A 48V (51.2V) 100Ah LiFePO₄ battery is 5120Wh.

So the one battery can power the A/C for 3 hours (it can actually run it for about 4 hours).

To replenish the 3500Wh used by the A/C, assume 5 hours of solar. 3500Wh / 5h = 700W of solar production needed. A 1000W of panels should be able to put out 700W.

The above all assumes a clear sunny day every day. If you need to deal with a few cloudy days then you might need two or even three batteries and more solar.

 

[BattleAxe]

1000W for 3 hours is 3000Wh. But through an inverter it would be about 3500Wh.
A 48V (51.2V) 100Ah LiFePO₄ battery is 5120Wh.

So the one battery can power the A/C for 3 hours (it can actually run it for about 4 hours).

To replenish the 3500Wh used by the A/C, assume 5 hours of solar. 3500Wh / 5h = 700W of solar production needed. A 1000W of panels should be able to put out 700W.

The above all assumes a clear sunny day every day. If you need to deal with a few cloudy days then you might need two or even three batteries and more solar.

Thanks so much!