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You might be on to something.
I have read that 10.8 is where you need to stop using the battery. I would up that to 11 volts even.
Is there any posibility you can put more solar power on your car?
Another good thing to know is the lower your system voltage goes the more amps out of your solar panel.
The panels I plan to build for my truck for example, the 6x6 cells I have should make a panel good for between 4 or 5 amps at 14.5 volts, but when the system voltage dropps off to 12 volts and less the amps from the panel should rise into the 5 to 6 amp range.
This is why I am wiring up those salvaged 0.4 amp float charging panels for 22.5 ocv, that way I get the whole 0.4 amps any time the sun is on them. I have tested them and they are good for holding battery voltage on 2 large truck batteries just over 13v.
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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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