Does zero-export clipping of excess solar cause the same PV calibration inaccuracy issue as export curtailment?

[llbbdd]

"switch.predbat_metric_pv_calibration_enable" section in the docs says:

"Predbat relies upon your solar generation being accurate so if your export generation can be curtailed by your solar inverter or your electricity supplier in periods when there is excess electricity in the grid, then you must turn PV calibration Off as otherwise Predbat will model the chopped solar generation as a PV calibration factor and will significantly reduce your forecast PV generation, leading to a very inaccurate plan."

I have a zero-export system, and if my battery is at 100% and the home usage is less than the solar can provide at that moment, any excess solar that would otherwise be available is clipped. Does that lead to the same plan inaccuracy problem mentioned above? This isn't an issue for 6/7 months over the winter, but the summer months would under-report by quite a large margin.

[gcoan]

Yes, Predbat's PV calibration (turned on by default) calibrates your solar forecast based on a historic comparison of forecast to actual generation.

So if your inverter clips generation when it can't be self-consumed or charged into the battery and would otherwise be exported, then Predbat will read that clipped generation as indicating that your panels are shaded, not able to generate the forecast amount, etc, and will downwards adjust your solar forecast accordingly.

As the docs say, turn the switch on to prevent this happening, or turn off PV calibration. Either is needed for your setup.