Check the listing for details. ACOPOWER Midas 40A MPPT Negative Ground Solar Panel Charge Controller LCD Displa. Condition: New. Listed at 135.83 USD. 40A Midas MPPT Charge Controller The Midas 40A is ACOPOWER's first MPPT charge controller. It is a negative ground controller. This ensure compatibility with any negative ground system, which is the standard and most conventional way of grounding. It is 40 amps 12V/ 24v auto continuous charging capacity, enables use of up to 12V/520watts, 24V/1040watts. SpecificationsNominal System Voltage: 12/24VDC AutoBattery Input Voltage Range: 8V～32VBattery Type: 1. Lead-acid battery including Sealed (default), Gel, Flooded and User; 2. Lithium Battery including LiFePO4, Li and User;Rated Charge Current: 40ARated charge Power: 520W/12V 1040W/24VMax. PV Open Circuit Voltage: 100V (1) 92V (2)MPPT Voltage Range: (Battery Voltage+2V) ~72VRS485 Interface: 5VDC/200mA(RJ45)