The system is cutting out battery capacity at 70% when voltage is still reading a good 52V, so I assume it’s the BMS protecting the batteries as 1 or more cells must be unbalanced.
My questions are.
1. What voltage does the internal BMS of the battery start it’s top balancing?
2. What is the nominal balancing current of the internal battery?
3. Does the external VE.Bus BMS do any balancing between the 4 x 12V batteries in series, if so what is the top balancing voltage and balancing currents?
4. Is the only way of reading cell voltages is via a VE.Bus Smart dongle and would I have to update multiplus firmware?
System
Multiplus 48/5000/70-100 Firmware 407
Colour control GX V2.71
Solar Charger MPPT 150/85 v1.19
VE.Bus BMS
8 x Smart Lithium 60Ah connected 4S2P
Also have MK3 programmer