question

Daniel Hillenbrand avatar image
Daniel Hillenbrand asked

ESS regulation becomes slow and less accurate when using /Ac/PowerLimit

Hello.

I've attached my Solis single-phase inverter on AC-Out (RS485, Modbus RTU) via USB converter to my ESS (CG EM540, Cerbo GX, MP II 48/5000, MPPT RS 450, SmartSolar 150) and injecting it's data via my own driver (https://github.com/codeworkx/dbus-serialinverter) to dbus (pvinverter:20, ProductID 0xA144).

When not using /Ac/PowerLimit (https://github.com/codeworkx/dbus-serialinverter/blob/master/etc/dbus-serialinverter/dbushelper.py#L137) parameter everything is working as expected. But as soon as i start using /Ac/PowerLimit the zero-feed-in regulation of the ESS assistant feels slower and the whole system never reaches zero-consumption state. The regulation is not as accurate as without using PowerLimit.

This also happens when using dummy data.

Am i doing something wrong?


ESS
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1 Answer
Maurice Schmicking avatar image
Maurice Schmicking answered ·

Hello,

I spent the whole day trying to get "my own" driver running with a power limit and can confirm this.


Besides the fact that Victron does not write anything on this path, (see the image)


1686855704281.png
ESS regulation doesn't work as expected see:

1686856006805.png

What's the point of this path when it's not useable? I was searching the Internet for this topic but did not find any useful information. At least I share my experience with that.


1686855704281.png (47.0 KiB)
1686856006805.png (84.8 KiB)
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