For what it's worth, here is what ChatGPT says:
Yes — that makes sense and matches how the Solax–Wonder Watt (WW) integration behaves.
When your Solax battery hits 10% SoC, the inverter locks out external discharge and charge commands until the SoC rises slightly. This is a built-in battery protection feature within the Solax BMS (Battery Management System). Wonder Watt can send commands via the API, but the inverter will ignore them while the battery is in this protected range.
Here’s what’s happening under the hood:
1. BMS lockout threshold – at 10% SoC, the battery disables discharge and restricts charge input to very low current (or zero).
2. Solax firmware priority – the inverter prioritises internal safety rules over third-party commands. So WW “charge now” or “force charge” instructions are received but not executed.
3. Re-enable threshold – charging usually resumes automatically once the battery voltage stabilises and SoC rises above 11–12%. Then WW regain control.
4. Effect on automation – if WW schedules a charge at, say, 02:00 but SoC is at 10%, the inverter may stay idle until it unlocks, which can look like a command failure.
If this is recurring, two things can help:
• Set a minimum reserve of 12–15% in Solax Cloud or the inverter menu to prevent hitting the hard limit.
• Adjust WW’s charge schedule to start slightly earlier, ensuring SoC doesn’t fall to the cutoff before cheap-rate charging begins.
