Good morning everybody!
I've upgraded our system from 3 x Multiplus II 48/5000/70 (3 phase) to 6 x Multiplus II 48/5000/70 (3 phase with 2 parallel).
The rest of the system is unchanged which means, there are still 16 kWp solar panels with 3 MPPT 450 and 20 kWh Pylontech batteries.
With this system upgrade I also had to upgrade the firmware of the older Multiplus to have matching versions (from 496 to 506). The configuration of the Multiplus II devices is the same as before.
What I've seen now in the VRM portal, after the upgrade the system is consuming more external grid power than before.
E.g. this is one day before the upgrade, 0.3 kWh from the grid the whole day.
And this is one day after the upgrade, 3.2 kWh from the grid, 10 times more!
What could be the reason for this?
- Is it a new measurement algorithm for "from grid"/ "to grid" because of the firmware upgrade?
- Is parallel mode much more difficult to control?
- Any ideas?