Hello, I have 3x 130Ah Agm Victron deep cycle batteries connected in parallel (12V) that are being charged by Victron Phoenix Smart IP43 Charger. I also have Victron Smartshunt with corresponding temperature sensor connected with VE.Smart networking to IP43 charger and all devices are connecte to Ekrano GX with VE direct cables. I have the expert mode enabled on the IP43 settings, absorbtion voltage is set to 14.40V and temperature compensation is set to -24.00mV/C as recommended by Victron for this type of batteries. Today battery temperature was 17 celsius and absorbtion voltage was around 14.60V (which coincides with temp compensation settings). My concern is the following; will the charging voltage be increasing in parallel to the temperature decrease without any top limit? If yes then at 5 celcius temperature, absorbtion voltage would be around 14.90V. Would that be harmful or ok for the batteries on a long term? Thanks
Hi @Elh
Pb batteries are very sluggish when cold, and need that extra V to charge at a similar rate to when specced at 25degC. But there’s limits that will be adhered to when applying the correction. The manual for your particular unit should state those, perhaps 6 to 50 degrees. If actually outside that then maybe you could consider deferring charging?
But normally it won’t hurt at all, providing the Temp is being passed across and applied correctly.