I'm surprised you are only getting to 80% SOC. We reach 100% after two to four hours of full sun with the morningstar 10 PWM. With full sun We have 10 amps into the batteries with two 80 watt panels. Now it could be the difference in batteries since we don't use golf cart batts; but two 12 volt 95 aH. They should charge at 8 to 9 amps, while the golf cart really need about 20 amps @ 14.8 to 15.5 volts for a 225 aH battery.
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Axis 24.1 E 450 chassis, 6 spd tranny. GVWR 14500# GVCWR 22000 # GW(scales) 12400 #
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mods: 2- 100 watt solar panels, on roof, 300 watts portable
“They who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety.” Benjamin Franklin
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