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That is a symptom of the compressor being shorted out and testing can determine that. It can also be caused IF you are pulling more amps on the cord where you are plugged in than is available............like using an extension cord or adapter on the cord. IF you are on an inverter and batteries, then it can be the total load is too large OR the batteries just can deliver that much power at that time. Check the total loads you have hooked up. The water heater on A/C mode (if you have that) can do that. It can be a defective breaker, but you already tried that here. Hope that proves helpful here. Please get back to me if you need more as all follow ups are included in our fee.
With an ohm meter. That isn't always conclusive if the compressor is locked up. IF you see any reading between any of the terminals once disconnected and the case, then it is shorted out. That is the most common cause. I would make sure that nothing else is on that circuit. When a water heater element shorts out it does this. Eliminate any other possibilities. R.J.
This should be powered up by the batteries and converter now.............are you trying to bypass the converter? IF that was the issue, you would blow the breaker even if the fridge was off. But, yes.......you can. Just be sure the polarity is correct.