Our parallel Multipluses are not charging our batteries from the generator correctly. Our SOC is 76% and yesterday, when the generator started, it went straight into absorption (according to the VE Bus summary) and after an hour it went into float drawing minimally from our generator. The voltage during the absorption was only about 55v instead of the usual 58v. Today it didn’t even do absorption but went straight to float at just under 54v with the current dropping gradually from 30a to 11a over a 4 hour period.
Last year early in the ‘generator season’ (winter) our multipluses gave an error/alarm - the temperature sensor had failed. We replaced it this summer, but battery temperature widget shows no data has not shown any data since then.
The VRM VE Bus summary widget says that battery temperature is 50C, which is NOT the case! MPPT’s say the battery temperature is 7 C and that seems likely.
The Multipluses temperature compensation is set to -64.8 mV / deg C. Could temperature compensation be messing up the Multipluses and preventing them from proper bulk or absorb charging?
This is the third year with our Victron Off Grid System that runs our home. We have a lot of solar, but it’s winter now and need to use the generator to charge batteries.
Multiplus firmware v. 506 recent upgrade
Batteries are Flooded Lead Acid