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Isaac Shannos avatar image
Isaac Shannos asked

Max charge current setting on MPPT

Setting the max charge current on the MPPT,


Thinking of using a 100/50.


Will that be the max the MPPT will output at all given times?

My battery only has a max charge current of 30a. But my solar capacity would exceed 30a. If the battery is charging at 30a, and I have 50a of solar available what happens to the other 20a? Would be to used by the inverter if a load is turned on? Or would it not be available because of the max charge current set on the MPPT.


I assume DVCC would be helpful in this scenario but it is a small system I am trying to do it as minimal as possible.


Would Smart Battery Sense help identify what is going into the battery and what is surplus solar?


Or do I need a GX and have DVCC enabled.


Thanks in advance.

MPPT ControllersDVCCSmart Battery Sense
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1 Answer
Mike Dorsett avatar image
Mike Dorsett answered ·

If you just have the MPPT100/50, and set the output current to 30A, this will only produce 30A. The excess PV power will be curtailed - the MPPT won't take it from the Modules. If you also have an inverter or other DC loads, then you would need a smart shunt (or similar) GX and DVCC. It sounds like you need a bigger battery..? The smart battery sense won't help as it does not monitor the battery current - just voltage and temperature.

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