Gary RV_Wizard
Site Team
1000 CCA doesn't translate at all in amp-hours, which is what you need to know to estimate inverter run time. A battery can have a high CCA and still not produce many amp-hours for long term use. Amp-hours are measured over a 20 hour time period, while CCA is calculated as a max amp rate for 30 seconds at zero degrees. I'll hazard a wild guess and say somewhere between 70 and 90 AH, but that's sheer guesswork.
The inverter uses DC power in proportion to the 120vac power demand. Basically, Watts-in x Efficiency = Watts-out. Watts are volts x amps and Efficiency for this sort of inverter is probably in the 80-90% range. To produce 400 watts @ 120v takes about 37 amps @ 12v and 90% efficiency.
The inverter uses DC power in proportion to the 120vac power demand. Basically, Watts-in x Efficiency = Watts-out. Watts are volts x amps and Efficiency for this sort of inverter is probably in the 80-90% range. To produce 400 watts @ 120v takes about 37 amps @ 12v and 90% efficiency.
A plain inverter (no charger and no internal transfer switch) is not an expensive or complex device, and the price reflects that. Nothing at all to fear with a big inverter in that price range, as long as Modified Sine output is OK.I don't think I'd put a 4000 watt, $138 inverter anywhere near anything I care about.