question

Chris avatar image

MPPT internal temperature and throttling information

I have 4 SmartSolar 100/30's hooked individually to 4 LG Neon 360w panels and communicating with a BMV-712 with temperature sensor. MPPT manual says full rated output up to 40c. Two questions:

Is it possible to read the internal temperature of the controllers?

What does the compensation curve look like at 40c, 45c, 50c, etc? Meaning how much power is cut?

MPPT Controllerstemperature
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1 Answer
mvader (Victron Energy) avatar image
mvader (Victron Energy) answered ·

Hi Cosmos,


Its a linear derating from full power at 40 degr C to zero at 70 degr C


There is no way to see the internal temperature.

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@mvader (Victron Energy Staff)

Hi, could I get clarity on where we expect to see this high temperature? At the Batteries (Via BMV temp sensor) , Internal to the MPPT's or at the panels? I am correct then that no temperature compensation will be made unless batteries reach 40C ?

Hi @Enya, above is about the solar charger internal temperature. Not visible anywhere; and not related to temperature compensation for battery charging voltages.

If there is a linear power derating as temps increase above 40, would it also be possible (in theory based on the capabilities of the hardware, or in practice) to derate current as temperature fall towards freezing?

This would be a useful option for LiFePO4 batteries.