[HELP] Zendure system soc

[Casantos75]

What do you need help with?

Entities, sensors, or controls

What are you trying to do?

I am trying to get system soc values and soc chart on dashboard.

What is happening instead?

System soc chart is not dispaying correctly in the dashboard and sensor.omnibattery_system_soc shows as "unknown", despite sensor.zendure_solarflow_1_battery_soc showing correct values and coherent history.

Your setup

Omnibattery version: 1.3.0
Home Assistant version: Home Assistant OS, Core 2026.9.1
Battery brand and exact model: Zendure Solarflow 2400 AC+
Battery firmware version: v2.0.2
Connection method or adapter:

What have you already tried?

I tied cheking the sensor mapping on sensor.py, but I was afraid to mess it up.

Relevant logs or screenshots

No response

Confirmations

• I searched the documentation and existing discussions first.
• I removed passwords, tokens, API keys, complete serial numbers, and other sensitive information.
• I understand that this is community support and a response is not guaranteed or immediate.

[ffunes]

Not a sensor mapping problem — nothing to fix in sensor.py.

System SOC is a capacity-weighted average, and the Zendure driver gets no nominal capacity from the device (the /properties/report payload has no kWh figure), so it uses the value you enter in the config. That field was optional and defaulted to 0, so if you clicked past it the aggregate had nothing to weight by and returned nothing at all — hence unknown, and the empty chart. The per-battery SOC works because it needs no capacity.

Fix it now: Settings → Devices & Services → Omnibattery → Configure → your battery → set Battery capacity (kWh) to your total pack capacity (e.g. 2× AB2000 = 3.84 kWh). sensor.omnibattery_system_soc starts publishing on the next poll.

Worth doing regardless of the chart: that capacity also feeds cycle counting, predictive charging and the pricing math, all of which quietly degrade at 0.

Fixed in the code for the next release (0fcd856): the capacity field is now required for Zendure, as it already was for Sessy, and the system SOC falls back to the plain mean of the per-battery SOCs when no capacity is known — so existing entries stored with 0 recover without a reconfigure.

Thanks for the report.

[Casantos75]

Thank you for the quick reply. All is clear now. Actually I had filled in the battery capacity in the config section right after posting here and I can see now that it is already working as expected.

Wonderful integration, really awesome. Thank you.

[Casantos75]

Just one more question related to system soc, I set a time slot for the off-peak hours, where the battery only charges, but the lowest maximum soc I can set is 80%. I needed a lower maximum soc, so that the battery only charges enough to support the house consumption in the early morning hours (50% or 60% would be enough), before the solar panels start producing. At 80% soc the battery has too much charge and will not be able to store all excess energy produced by the panels. Why can't we set a maximum soc below 80%?