http://www.bestconverter.com/1000-Watt-Pure-Sine-Inverter-Hard-Wire-w-Transfer-Switch-WF-5110R_p_177.html#.Xg4Y6EnsZpwWe all have a hate-on for WFCO converters, and here your WFCO inverter died. Anyway, that is expensive (and a little weird)
Check this out for doing the job at a much lower price and get a transfer switch as suggested.
https://powermaxconverters.com/product-category/inverters-dc-ac/A couple of us here have the 2000w one of those PMX jobs and they are working well. They also make a transfer switch for 30 or 50.
https://powermaxconverters.com/product/pmts/