Can the MidNite Solar CLASSIC 150-SL Charge Controller be used on a 32V system? Posted by Frank Molina, Stellavolta on Oct 15th 2019 Yes, the MidNite Solar CLASSIC 150-SL Charge Controller's battery voltage parameters are fully user adjustable. To adjust these voltages, follow these steps: Press Main Menu to enter the Main Menu CLASSIC 150-SL MidNite Solar Charge Controller 32 volt battery bank adjustable voltages solar controller