How long could I run a 115 Vac window unit on a 12v 200Ah battery (using a 700W inverter from a 400W solar panel and assuming 100% efficiency)? Thanks!
i will give you most basic calculation
assuming your battery in good condition and new with trusted specification.
12*200=2400W/h this can steady until 1hours rate = 2400W total output
assuming your converter connected with load is 100% back to back without loss power which is highly unlikely.. 2400/700 = ~3.43Hours
the calculation with solar panel is different because you doesn't gives how much sunlight and how long it will directed to sun..