System:
Two Quattros 10K-120V- setup in SplitPhase, ACin1 has a generator, ACin2 has the grid
Four MPPT SmartSolar 150/100 controllers with a total of 14 365W panels per string.
Large 1400Ah Lithium Battery managed by Batterie's internal BMS that communicates with Venus via CAN-BUS. The BMS is a REC-BMS.
Venus is configure:
ESS:
Mode:Optimized without BatteryLife
Grid metering: Inverter/Charger
Multiphase regulation: Total of all phases
Limit inverter per:OFF
Grid setpoint: 0W
Grid Feed-in:
AC-coupled PV:off
DC-coupled PV : ON
Limit system feed-in : ON
Max feed-in: 15000W
Scheduled charging: Disable
DVCC: ON; SVS:ON; STS:ON; SCS:ON;Temp:REC-BMS
Problems:
1- System will curtail the PV been generated to match the sum of the AC-load plus the BMS requires to charge the battery. When it should produce as much PV as it can and sell to Grid all that is not needed by the BMS to charge the battery.
2-Once the BMS has reached 100% SOC it sends parameter to Venus to charge at 1A, the system does not pay attention to it and send at least 20 to 50A, but now starts to allow the PV to produce the maximum PV and sells to the grid. Any variations in the AC-load make the battery charging amps to spike to up to 100A, at which point the DC Volt also rise to 65VDC. The batteries BMS send a voltage high ALARM and it it happens several times, the BMS goes into protection mode and disconnects the Battery. this also triggers an alarm38 in the Smart Controllers disabling them, and requiring a full disconnect.
