Max charge current setting on MPPT

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Isaac Shannos asked Jun 26, '21

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.

DVCC mppt charging Smart Battery Sense

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Answer 1 · 2021-06-26T01:59:18Z

Mike Dorsett answered · Jun 26, 2021 at 01:59 AM

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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