MPPT internal temperature and throttling information

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Chris asked Nov 29, '18

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 Controllers temperature

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Answer 1 · 2018-12-08T00:43:48Z

mvader (Victron Energy) answered · Dec 08, 2018 at 12:43 AM

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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enya commented · Feb 08, 2020 at 10:16 PM

@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 ?

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mvader (Victron Energy) ♦♦ enya commented · Feb 10, 2020 at 08:25 AM

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

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dzl commented · Apr 24, 2020 at 08:21 PM

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.

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jjbond commented · May 30, 2023 at 06:09 AM

I beg to differ....... I use the SmartSolar Control Display on the front of my MPPT's to see the internal temperature.

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kevgermany ♦♦ jjbond commented · May 30, 2023 at 12:01 PM

Yes, but this thread is 3 years old and you have a newer MPPT.

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jjbond kevgermany ♦♦ commented · Nov 30, 2023 at 01:53 AM

oh ok, sorry...

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krzysztof-chodak commented · Nov 12, 2023 at 10:42 AM

Could VictronConnect at least show that MPPT is being limited? I see it is present in the protocol. I was scratching my head why I am being limited to half of my PV panels power to find out that the MPPT was being quite hot. I will work on the ventilation but I would like to know when there is internal limiting triggered again.

Why there is about 1mm space between backplate of 75/15 MPPT and mounting surface? Is it on purpose? For sure it limits heat dissipation greatly.

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