[ComputerGuru]

Again, I think you are making the same mistake in your first sentence. 1000W does not mean 1kwh or one unit of electricity. It is a measure of instantaneous (or maximum instantaneous, there’s no way your pc regularly runs at 1KW unless you’re mining) power consumption, the “now” voltage times the “now” amperage (times the power factor… maybe).

For storage, none of that matters. What you need to look at is the cheapest total capacity in kWh after accounting for conversion losses at your median discharge rate. Let’s say your median consumption is 450W, then you see the efficiency of your inverter with 12V vs 48V input to produce a sustained 220V at 450W. Maybe it’s the same efficiency for both 12 and 48v or maybe one is 85% and the other is 80% so you need to multiply the capacity by that amount to get capacity after inverter conversion losses to account for the only difference between the two setups.