I have an Multiplus II 48/3000 GX as the core of my ESS. All the PV is DC coupled with SmartSolar. The Multiplus is connected grid parallel. The EM24 is used for energy metering. Due to german laws, I have limited the inverter power to a maximum of 600W.
Recently I added a possibility to connect devices to the AC Out of the MP2. When I have a full battery I disconnect the MP2 from the grid and run it in inverter mode to supply loads with more than 600W like the dishwasher.
The thing I can't get my head arround is the behavior of the MP2 in the case I leave the grid connected and run a critical load at the output with e.g. ~2000W. Then the MP2 runs with a power of something between 1000W and 2000W and i still use 300W to 900W from the grid, althought the MP2 is not running at full power. It is not a transiant behavior. I would have expected the MP2 either to
- stay at a limited power of 600W since it is still grid connected or
- to fully supply the cirtical loads and limit the AC IN power to maximum of 600W. (In this case run at full power with 2400W)
Has someone experience with this scenario and can explane this behavior to me?