Keep in mind that old microwaves are only 60 to 75% efficient. Add on top of that inverters inverters are 80 - 90% (very good ones can be 95% efficient) and the efficiency tails down typically as the load approaches maximum. Worst case scenario is that depending on your hardware, it could draw almost double the microwave's rated cooking power from the battery. 700w x 2 = 1400w. 1400w / 12 = 117 amps. Old ones have big transformers and a hefty inrush current at startup, too.
I would plan on a 2000w inverter and definitely a better BMS if you want to use a microwave. Headroom is always a good thing.
I would plan on a 2000w inverter and definitely a better BMS if you want to use a microwave. Headroom is always a good thing.
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