At your risk. All safety measures should be followed. Any voltage or current can be very dangerous.
Cause of malfunction of the sine wave inverter must had been the following:
Old battery developed an increased output impedance.
Once inverter was switched on under load the battery voltage dropped.
The digital protection electronics were asleep.
2 oitput mosfets were cooked.
IRF740 mosfets were very carefully replaced within a few days and inverter is back to work.
When one acts as being rich will always be rich.
After all we are always rich as the sun rises for each one of us.
The inverter too gets its energy from the sun by solar panels.
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