I have a number of new portable power systems, each with the same equipment:
- Victron Lithium Superpack 25.6V/50Ah
- BMV 712 Smart
- MPPT 100/20
- Solar PV, up to 3 x array of 400Wp each = total 1200Wp
The very large solar capacity is to cater for the very cloudiest days expected (no other charge sources available). This means that the vast majority of the time the system is going to have way more charge available than it needs. I am concerned about overcharging the Superpack and I have seen it recommended to not fully recharge Li-ion to maximise overall life.
1. From my lead-acid experience with the BMV, it likes to "synced" to 100% regularly to maintain accuracy. Not sure if this is the same with Li-ion? If so, then this conflicts with the recommendation to not regularly charge Li-ion to 100%
2. What would be your recommended settings for the MPPT in this case?
The default for the MPPT for Li-ion appears to be 28.4V, 2h absorption.