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I think you might need some solar panels and an MPPT type charge controller.
My genasun isn't even rated to be used with a single 10 watt panel but its working. On cool days it holds the battery at about 12.7 volts. The optima battery liked to sit at about 12.2v even when the alternator was hooked up before I started adding solar panels.
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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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