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Where does this say "under voltage" on the generator? And do you have a model number? That fault won't clear as long as the DC voltage on the batteries remains under 46 VDC and you have to turn off any loads on them first. IF the generator won't put out the correct AC voltage the inverter won't work properly. I am guessing that the issue right now is the generator AC output voltage. I am not familiar with a Baldor genset.
Attached is a link the manual for this in case you don't have one already..........http://pdf.wholesalesolar.com/inverter%20pdf%20folder/XantrexXWmanual.pdf?_ga=1.251533441.687491893.1445830217
Were you able to get this issue resolved or do we need to dig deeper for a solution?
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