Generator "Acc. runtime" not correct

Q&A and troubleshooting
, , , , ,
1

Hi everyone,

I’m running an off-grid system for our house with the following setup:

  • MultiPlus II 48/5000/70-50 (firmware v556)

  • 3x Pylontech US5000

  • MPPT 250/100 | 12 panels

  • Cerbo GX (latest firmware)

  • Generator: Genergy Creta-SOL

Everything works fine — solar charging, inverter performance, and automatic generator control. I use a digital input on the Cerbo GX to start and stop the generator automatically. It also triggers when battery SOC drops below a set percentage (e.g. 25%) and stops charging once it reaches the configured level

However, I’ve noticed one strange issue:

The generator “Acc. Runtime” always stays at 2 seconds.

The generator itself runs perfectly. I can:

  • See runtime hours directly on the generator screen.

  • See in VRM when the generator is running, how much power it’s producing, etc.

But the accumulated runtime on the Cerbo GX never updates — it’s stuck at “2s” no matter how long the generator runs.

Has anyone encountered this before? Could this be related to how the digital input is configured (manual vs auto mode), or do I need to map the runtime via a Modbus or relay input instead?

Any insight would be greatly appreciated.

Thanks in advance!

Niels