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Running my 400 w heater easy,but 800w microwave just spins and doesn’t heat. No overload lights

Hi, The information in this link explains the problems of running a microwave oven from an inverter. It is mainly due to the applied DC voltage value and the fact that your inverter does not supply a pure sine wave AC output https://amplepower.com/pwrnews/micro2/in… Here is also a link from which the relevant specification for your inverter was taken PV3000HF/ Output Waveform: Modified Sine Wave https://www.tripplite.com/shared/techdoc