# question

## 12v/220ah batteries

Hello all

How long would a 12v/220ah battery last (assuming its fully charged) if it was powering equipment that was using 6kw (26amps). Is it as simple as dividing 220 by 26 amps?(220÷26 =8.46 hrs) or am i completely wrong

Cheers

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Your calculations are not quite right.
You said the equipment is 6KW, which would be 26A at 230V, that part would make sense.

6KW on the 12V battery will be 6000W / 12V = 500A. If that 220Ah battery would supply 500A, it will not do it for very long at all.
It's not as simple as 220 / 500 = 26 minutes. You would probably get 110Ah out of it at that rate so 13 minutes. That is down to 0% SOC, which you don't want to do, so divide by 2 for 50% SOC and you have 6.5 minutes, back of the envelope calculations.

Consult your battery's documentation to find out if it can supply 6KW and it should tell you the capacity at that rate.

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