VEVOR 40 Amp Solar Charger Controller, MPPT Charge Controller 12/24/36/48V, Solar Controller High Efficiency≥99.5% Solar Panel Controller w/ LCD Screen for Gel Sealed Flooded Lithium Battery Charging
This is generally if the 12V system generally has an open circuit voltage of not less than 21V; if the 24V system generally has an open circuit voltage of not less than 42V and above.
