We’ve had an OutBack 2800 watt, Vented Model VFX2812M. True sign wave, 5 year warranty and made in the US. It’s field repairable by swapping out circuit boards. Our has been in service for 10 plus years and is still manufactured & supported.
Outback Power Inc. - Mobile Inverter/Chargers Vented VFX3232M
OutBack also makes a highly regarded MPPT charge controller for solar for easier integration.
Outback Power Inc. - Charge Controllers FLEXmax 60/80
No relationship, just a happy customer.