Victron LiFePo4 90Ah and Low temps

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bones83 asked Feb 28, '21

Victron LiFePo4 90Ah and Low temps

Hi,

I have 4 LiFePo4 90Ah batteries that are about 6 years old. They are not the smart model, but do have BTV leads to connect to a VEBus BMS.

The system will be setup in a location where on occasion the batteries could experience temperatures of 0deg C.

I will be purchasing a smartshunt in order to measure consumption/soc etc.

If I purchase the temp sensor for the smartshunt, will this cut the charging current from both multiplus and victron mppt if the temperature drops below 0deg C?

I also have a Color Control GX that will be installed with the system and connected to the smartshunt and mppt via V.E direct. The CCGX will also be connected to the multiplus via V.E Bus.

Thanks

Lithium Battery SmartShunt temperature

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Answer 1 · 2021-02-28T20:06:14Z

seb71 answered · Feb 28, 2021 at 08:06 PM

If battery type is set as Lithium and the SmartShunt/BMV has the temperature sensor, both the SmartSolar and the Multiplus should stop charging if the temperature drops below 5 degrees Celsius (this value is adjustable in case of the SmarSolar charger).

But I can't confirm if it actually works (if it actually stops the charging), because my battery never gets so cold.

Multiplus:

SmartSolar:

multiplus-ii-lithium.png (75.7 KiB)

smartsolar-lithium.png (24.6 KiB)

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Answer 2 · 2021-02-28T20:12:15Z

bones83 answered · Feb 28, 2021 at 08:12 PM

Excellent! Thanks very much for the quick response =)

Obviousy I will be doing all I can with insulation to try to ensure the bank wont experience cold temps, but better safe than sorry!!!!

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Answer 3 · 2021-02-28T20:25:20Z

Matthias Lange - DE answered · Feb 28, 2021 at 08:25 PM

The BMS should stop the MPPT and MultiPlus from charging if the temperature inside of one battery gets below 5°C.

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