Max feedin power

[grzywek]

@Skipper

Or will the multiplus handle the max and you can set it as high as possible (-5000W) and the Multiplus will manage the maximums safely without risking overload?

Yes, exactly. You can enter any values, but Multiplus will handle them within its technical capabilities and in the context of the other settings (e.g. they may be mutually exclusive, different options may have different priorities, etc.).