Actually you'll be doing well to get better then 90% efficiency (esp. at
full output!)  - so for  1kW out, the input power  is 1.111kW or 88.8A at
12.5V
RP


83 1/3 to be precise.  Of course, typical battery voltage is more on the
order of 12.5V so you're looking at 80A.

If the 12V becomes a limitation, I can string the batteries together and
get any voltage I want with proportionate decrease in current.

Do you have any help with the circuit?

Thanks,

Gary

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