24 volt to 12 volt converter
Looking to run 600 watts of solar to my 40 amp MTTP controller at 36 volts. I have 4-6 volt batteries. So I need to get my 24 volt battery bank down to 12 volts to my Magnum 2012 inverter charger. ...
Forum Discussion
Your MPPT controller already has a buck converter in it that takes the "24v" solar array as input and puts out "12v" on a "12v" battery bank. (as above make the 4-6s into a "12v" ) Connect the controller to the batteries FIRST so the controller can see it is on 12v, then connect the input wires from the array.
BTW the MPPT controller will pick an input voltage from the array depending on what the array can do at the time with the sunshine available and the state of the batteries on being charged. In "bulk" the controller will pick somewhere near the panels' rated Vmp. After that during absorption and float it will pick a higher voltage. That 36v mentioned is perhaps the Voc of the panels.
The voltage on the wires from array to controller will be at "24v" so they can be thinner than the wires from the controller to the battery bank which should be shorter and fatter to carry the "12v". Place the controller as close to the battery bank as you can.
BTW the MPPT controller will pick an input voltage from the array depending on what the array can do at the time with the sunshine available and the state of the batteries on being charged. In "bulk" the controller will pick somewhere near the panels' rated Vmp. After that during absorption and float it will pick a higher voltage. That 36v mentioned is perhaps the Voc of the panels.
The voltage on the wires from array to controller will be at "24v" so they can be thinner than the wires from the controller to the battery bank which should be shorter and fatter to carry the "12v". Place the controller as close to the battery bank as you can.
