Cheap generators will only run for maybe 200 hours before you have problems with them.
The cheapest way to get a high voltage DC charger that I can think of is to use a 220v Varrac and set up an array of bridge rectifiers. One that has an input voltage of 220v and has an out put range of 0 to 300v. The decent sized varrac like I have can handle 5kw. But you would need a real generator that puts out 220v power, 110v power would work at greatly diminished capacity.
If you don't know what you are doing this can also be a quick way to die.
Turbine powered generaters suck fuel like you wouldn't believe, I work on those too.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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