Hi all,
Looking for help with a plant setup issue that started about a month ago.
System Setup
- Single phase
- 2 × GIV-AC3.0 (plant setup)
- Each inverter has its own 9.52 kWh battery
- Firmware: D0.535-A0.535
- BMS version: 3022
- Mode: Eco
- Minimum SOC: 4%
- No visible fault codes
- Inverter LEDs green blinking
- WiFi dongles connected
The problem is both batteries charge correctly during the night charge window and I assume during periods of solar.
However:
- Inverter 1 + its battery behaves normally and discharges to support household load.
- Inverter 2 battery charges to 100% but remains in WAITING.
- It will not discharge automatically, even when the master battery drops to 4% or when household load is above the inverter #1 max (3kwh)
- The only way to get it to discharge is by manually forcing discharge.
- After that, it recharges overnight back to 100% and returns to WAITING the next day.
So effectively only one inverter and battery are serving the house.
When the “problem” battery is in WAITING:
- SOC = 100%
- VBat ≈ 55V
- TBat ≈ 13 to 24°C
- PBat = 0
- Pinv = 0
- Load = 0
At the same time, the other inverter is discharging to support household demand.
This suggests the second inverter is not load following or not participating in discharge logic, rather than a battery fault. The battery appears healthy and responds to manual commands.
Is this likely:
- A plant configuration issue?
- A CT clamp / load reference issue?
- An inverter role assignment problem?
- A firmware regression in D0.535-A0.535 affecting plant coordination?
Has anyone seen similar behaviour where one inverter in a plant setup charges normally but never discharges, even when the other inverter hits minimum SOC?
It all worked perfectly (as perfectly as these inverters/batteries ever do) until about a month ago when I experienced dongle issues, and had to reset them. Coincidence?
Thanks