Libre Solar Community Forum

Change max charging current

Hi Martin, nice project. On the MPPT-2420-HC if I wanted to lower the max charging current from 20 to 15 amps would I simply change resistor R6 value from 2M to 2.67M? Or would I also need to change the inductor?
Also is the things set protocol implemented in the firmware?


No need to change any hardware, you can limit the max. current via software (ThingSet protocol, configuration parameter BatChgMax_A). And yes, the ThingSet protocol is fully implemented in the firmware. You can find all the exposed parameters in the data_nodes.cpp.