That is a SOLAR charge controller. If you have any load at all on the batteries it will show a lower voltage. Check the voltage at the batteries with a volt meter while the engine is running. (Make sure to run the RPM up to about 1000 and then let it idle before you check it to make sure the alternator is putting on a charge. Plus, reading your % of charge from the inverter is a joke. the only accurate way to measure % of charge is through monitor that uses a shunt. (I know this wasn't part of your question)
Tim
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Full Time 2000 Dynasty Regent FD, 8.3, Banks Turbo, 5" Diameter Exhaust, 475 HP 1425 Torque, FASS system, towing 05 Pilot 1500 Watts solar 800ah lithium & E-Bike
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