Blowing inverters when run off generator - EASUN iSolar SMR II Inverter 5.5KW ( REVO-WM II 5.5KW )

[Skyrider]

EASUN iSolar SMR II Inverter 5.5KW ( SOROTEC / REVO-WM II 5.5KW )

I keep blowing up inverters when connecting them to a generator....

I am off-grid... when the inverters are running off batteries and solar panels they are fine, but after 3 or 4 days of rain the batteries are empty. So I connect the generator to the AC in on the inverter, it runs for 30 minutes or so charing up the batteries and some of then the inverter blows ( ICs in the inverters start blowing )... I have blown 3 inverters so far.... getting expensive.

Any knowledge on what might be happenign would be most welcome.

You need "clean power" that your generator can't offer to your inverter. Had to try my generator but I see that the quality of the current was not sinusoidal... Try to use a filter and if you can check the waveform with an oscilloscope..