On the Multi RS Solar 48/6000/100 + Cerbo GX + 2 Pylontech 5000 Batteries I have 4 panels in series with each VOC= 45,59V / 500 Watts on each entry of the Multisolar. Outside temperature is about 20 degrees Celsius.
How is it possible to get this error: #29 Over Charge Protection ? Sometimes the Cerbo is just beeping and sometimes it disconnects the AC Out of the Multisolar for about 1 minute.
Error 29 - Over-Charge protection
Summary
This error will auto-reset once the battery voltage drops below the float voltage. To protect the battery from over-charging the battery is disconnected.
Possible causes:
over-sized PV array configuration, if there are too many panels in series the battery voltage cannot be reduced any further. Consider wiring more PV panels in parallel to reduce the voltage.
configuration issue, check if the battery settings match with the installation (especially absorption and float voltage settings).
another charger in the system raises the battery voltage above the expected level.
Obviously with 4 in series your float x 8 is not exceeded.
So the next is to see is the battery actually being overcharged? Voltage at mulri rs terminals vs battery terminal voltage comparison with what the bms is requesting on the cerbo etc?
As per Victron instructions I set the Multi RS to remote controlled by the Cerbo/BMS. The voltage should be the same, but I will get a multimeter and measure… if not the same, I cannot change it ?
No but it will be an indicator of something else being wrong or needs attention.
So you need to verify…
does the inverter measure correctly (both with a meter and with the appp?
Does the battery measure correctly?
How has the system been programmed?