Recently installed 3x320 LiTime batteries, the BMV-712 and CerboGX in a marine application. The time remaining value in the BMV has always been in the range of 10d0h to 9d23h even when SOC is 100%. Presently the house bank is showing -1.1A continuous, so at 100% SOC with a discharge floor of 20%, the time remaining should be around 32 days. At 100% SOC time remaining is 10d0h. Peukert is 1.05, time to go averaging period is 3m.
When I increased the load substantially (~150A) the time remaining corrected, but at low load it is significantly off. I know that time remaining is just math, but I don’t understand why the math appears to be wrong.
I can’t tell you if that has technical reasons (size of the registers holding that value?) or just is a design decision, but you won’t see anything larger than 10d anytime.
Even though that answers OP’s question, I noticed OP has peukert set to 105% on a lithium battery. I know that’s in the BMV manual but I never really understood why, the BMV has 24bit ADCs, top notch coulomb counting, and lithiums cells are practically 100% coulomb efficient (elections/lithium ions/consumedAh). The only measurable ‘consumedAh’ losses I ever noticed were caused by a BMS sitting in between battery and BMV and then still mostly related to balancing losses. Wouldn’t you agree it be better to set both efficiency as well as peukert to 100% instead?