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Problem with laying panels flat is they only produce about 50% of rated power. Actually more like 40% in the winter and maybe 60% in the summer.
Then the PWM charge controllers only let 2/3 of what the panel produce through to the battery. So in the winter you can be getting as little as 24% of a panels rated power.
Using a PWM charger on a vehicle based system is a waste of time and money.
But if you use a MPPT controller you get around 98% of what the panel produces.
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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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