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I would say anything over 12 volts is good when cycling it. Depending on load that means you likely have not gotten into the bottom half of its capacity.
You want to make sure that battery gets a good charge when the car is home. The deeper you cycle the battery the quicker it will die.
As long as your solar panel can build over 18 OCV in normal day light it should be good for charging. I believe about 17 volts is the cut off for effective charging.
The solar panel I would like to build for my truck has a target voltage in the 18.5 to 19 ocv range. If it turns out to build between 19 or 20 ocv I wont be sad.
The under load target is 14.5v @ 5 amps.
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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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