[Richard]

Hmmmm,

If there are other loads on the inverter when you turn on the micro, it can drop the voltage below the voltage cutoff point. That cutoff point is adjustable. If you can scroll through the menu until you find the LBCO, and then monitor the voltage on the Magnum screen while starting the microwave.

This is a bit of a tricky problem in that the inverter cuts out for second, then resets automatically when the voltage comes back up, and to my knowledge leaves no record of an error.

I know for a fact, even with my massive Lithium bank, that I cannot run the microwave AND the water pump at the same time without causing this fault to occur. Rhonda has learned not to turn on the faucet if the oven is running if we are on battery power.