Starting batteries instead of deep cycle
So I’ve got a theory... Deep cycle batteries are designed to slowly discharge low current for a long time. Starting batteries are designed to put out high current for short periods. Generally, p...
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We easily power a 1100 watt (line input, not cooking power) microwave with our two Costco 6-volt GC2 batteries (110 amps DC). Briefly powered a 1250 watt coffeemaker with no issue, but generally we use a smaller k-cup coffeemaker that only draws 750 watts.
If I was having similar problems as the OP I'd be checking voltage at the battery and inverter terminals under maximum load. With the batteries fully charged, the voltage at the battery terminals shouldn't drop much below 11.8 volts or so with a 100-120 amp load (with two GC2 batteries). Ideally, I’d strive for no more than a 2% (.24v) voltage drop between the battery and inverter terminals with a maximum load. Any irregular voltage readings might be indicative of a bad battery, too small battery/inverter cables, or bad connection/ground.
If I was having similar problems as the OP I'd be checking voltage at the battery and inverter terminals under maximum load. With the batteries fully charged, the voltage at the battery terminals shouldn't drop much below 11.8 volts or so with a 100-120 amp load (with two GC2 batteries). Ideally, I’d strive for no more than a 2% (.24v) voltage drop between the battery and inverter terminals with a maximum load. Any irregular voltage readings might be indicative of a bad battery, too small battery/inverter cables, or bad connection/ground.
