Post by prizfindr on Apr 24, 2019 15:45:41 GMT
Yesterday I connected a brand new Renogy LFP 170ah battery to a new PD4045-L converter, via a Victron BMV-712. I have confirmed the BMV-712 is wired correctly to the battery, and settings are correct.
Battery tested at 13.3v using a multimeter at the terminals. I connected to shore power and after about 5 hours the voltage had raised to 14.57, and seemed to continue rising (although amps had decreased to about .25 amps, which is what I expect to see for parasitic draw on my TT). These last measurements were taken using the BMV-712 monitor, but the days experience told me that the Victron was reading about .11 lower than a direct measurement at the battery. I became concerned with the increasing voltage, so I disconnected the shore power.
This morning (6.5-hours after disconnecting the battery), the voltage at the battery reads 13.78, and appears to continue slowly discharging. Ambient temps last night got down to 40F, but continue to rise this morning (now 45F). Battery is still disconnected from shore power, so there should not be any appreciable load.
First question: What should I expect to see as the "resting" voltage of the Renology 170ah Lithium battery given an ambient temperature of 50F? Second: If the battery is not connected to any load and the voltage continues to drop, does this indicate a bad cell or BMS?
Thanks
Battery tested at 13.3v using a multimeter at the terminals. I connected to shore power and after about 5 hours the voltage had raised to 14.57, and seemed to continue rising (although amps had decreased to about .25 amps, which is what I expect to see for parasitic draw on my TT). These last measurements were taken using the BMV-712 monitor, but the days experience told me that the Victron was reading about .11 lower than a direct measurement at the battery. I became concerned with the increasing voltage, so I disconnected the shore power.
This morning (6.5-hours after disconnecting the battery), the voltage at the battery reads 13.78, and appears to continue slowly discharging. Ambient temps last night got down to 40F, but continue to rise this morning (now 45F). Battery is still disconnected from shore power, so there should not be any appreciable load.
First question: What should I expect to see as the "resting" voltage of the Renology 170ah Lithium battery given an ambient temperature of 50F? Second: If the battery is not connected to any load and the voltage continues to drop, does this indicate a bad cell or BMS?
Thanks
