RE: 1.5 KW Gen set
Hugh,
There are lots of inverters for converting DC to AC in the marketplace, but I'm not sure whether you can even convert 28 volts to 110 volts which you would need to power items in your house. If you could even find some unit that would do that, I think the cost would scare you. If you have no need to power 28 volt items (such as military radios or charge 24 volt batteries) I would suggest selling it or using it as a partial trade to someone for one of the 110/220 3kw or 5kw units that would be way more useful and much easier to hook up for an emergency back up unit.
Personally, I have a sweet , low hour 3kw 400 hertz unit that I can use to power lights only. I have a 3kw 60 hertz unit that I finally found a voltage regulator for but don't have installed yet that I will use for alternate house power one of these days when I find the time to get it up and running.
BC