I think we need input from someone else that controls blinds or similar based on output from the Inverter. As I understand this is what you want to do?
MPP A/B is either DC voltage or DC watts and could be for only a subset of your solar panels depending on how your installation looks like. Could even be panels in different directions (MPP A - east, MPP B - west).
Grid power (Netvermogen), is the total AC power generated from all MPP inputs.
