Title: SmartSolar MPPT output remains limited until AC load changes
System:
- Cerbo GX MK1
- Venus OS v3.75 (same behavior on v3.73)
- SmartSolar MPPT 250/100 connected via VE.Can
- 3x MultiPlus-II
- Fronius Symo
- Pylontech batteries
- ESS enabled
- DVCC enabled
Issue:
I have found a repeatable issue.
When the battery is around 99-100% SOC and a large continuous AC load (heat pump approximately 3 kW) is running, the SmartSolar MPPT sometimes remains at a much lower output than the available PV power.
The Fronius inverter continues producing normally.
If I switch the heat pump OFF for only a few seconds, the MPPT immediately starts increasing its output to the expected value.
When I switch the heat pump ON again, the MPPT continues operating normally at full power.
This behavior is repeatable.
Previously I thought restarting the Cerbo solved the issue, but after further testing I found that simply changing the AC load is enough to trigger an immediate recalculation and the MPPT ramps up correctly.
It looks like ESS/DVCC or the external MPPT control does not always recalculate the available PV power correctly until the AC load changes.
Has anyone else observed similar behavior?