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Free Tammi asked

LiFePO4 float/absorption under 0 Celsius

Hi I wanted to ask if it normal for the MPPT to display 14.2v absorption / 13.5v float at temperatures under 0Celsius? We have a LiFePO4 battery with an internal BMS so we're assuming that the BMS has done a lockout preventing charge and that the solar panels are simply using the connections to the battery as a bridge and only using solar energy as the main voltage?

Also, any advice on trying to keep the battery warm above 5Celsius? How long would it usually take for the battery to accept charge again?


screenshot-20221209-145307.jpgscreenshot-20221209-145321.jpgscreenshot-20221209-145314.jpg

MPPT ControllersLithium Batterycharger
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klim8skeptic avatar image klim8skeptic ♦ commented ·
Array Voc of 152.19v = warranty void.
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snoobler answered ·

Not all LFP batteries have low temp charging protection. Have you confirmed that yours does?

Your performance data is pretty inconsistent.

and of course, @klim8skeptic 's point... > 150Voc on a 150Voc controller may destroy it.


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