How to make the Best and Safe use of MPPT charge?


Firstly, MPPT charge starts only if the PV with a voltage difference higher than the battery. Usually this voltage difference should be higher than 3V at least.

Secondly, all MPPT device may have a limit on max input voltage. For example, Helios’s MPPT controller VENUS-M2440 with a max input of 100Voc, so this 100Voc (PV open circuit voltage, not rated voltage or working voltage) is the limit, and you can not plug in arrays over this limit. * usually 100Voc means 75V around of working voltage.

Thirdly, if the voltage difference between the battery and PV is too much, then we may have a not small power loss, so we need to control the array voltage by connection more parallel and less series on panels. For example, for controller VENUS-M2440 (12/24V), if you have 2 panels of 36V, then it’s better to make them connect in parallel (36V), but not in series (72V). However, it’s not really a big deal, the difference could be very small. If you find it’s not convenient to make the modules connected in parallel, then just do it by series.

Scan the QR code Close
qr code