In June 2023 we installed a new 48V 3000MPII, Cerbo GX and Pylontech US3000C battery. Between June 2023 and March 2024 we had regular loadshedding (no power for 2 hours, two to three times per day). During loadshedding we could run our 2kW kettle without issues (the load without the kettle is roughly 400W). Since March 2024 there’s been no loadshedding and the battery has been kept charged by the MPII. I’ve read elsewhere that keeping a battery charged indefinitely negatively affects the battery. This claim seems to be substantiated by the fact that if I now switch to inverter, the battery immediately drops from 52.2V to 49.3V. If I run the kettle I get a “Low Battery” warning, with the battery dropping to below 48V. I’ve now decided to “exercise” the battery by switching to inverter for an hour every two weeks, hoping this will restore the battery. Is that a good or bad idea?
How many Pylontech units are you using and how are they wired? A photo would always be helpful …
One Pylontech US3000C. Our low load allowed us to drop no lower then to 75% battery capacity after 3 hours of loadshedding.
It is possible to use a Lifepos battery directly on a Multi Plus … but this is not recommended because there is NO CHARGE MANAGEMENT.
The DVCC control, which is provided by a GX and takes over cell monitoring, is not available when using a Multi directly.
This is definitely feasible, but you absolutely have to get a ‘single cell’ status. The warranty from Pylontech is very limited here … they can probably view the battery log in an emergency … but whether this is true is unknown.
Just get a GX unit … ColorControl/Venus/Cerbo or Ekrano … or a Raspberry solution to gain better control over your system.
The system currently includes a Cerbo GX. Lowest cell voltage 3.359V, highest cell voltage 3.365V. Cell temp: 24°C.
Super … GX … check 
Then please show your settings from the VE Configure setting. A voltage is probably set too high here.
Is the system registered in VRM?
Make sure you get an additional US300C … the recommended discharge current is 37A …
37A x 48V = 1700W
your coffee machine is already above that …
When the Pylontech is connected to a Victron MPII via the Cerbo GX, all battery related settings are taken care of by the Pylontech BMS, connected to the Cerbo GX via a dedicated “ASS030710050 VE.Can to CANbus BMS type A Cable”, which in turn is connected to the MPII via an RJ45 cable.
Of course you can discharge your single Pylontech with over 37A … but not for long … see data sheet.
That’s why an additional Pylontech is highly recommended …
And you can’t train your battery … just make sure that the cells get above 3.4 V for a while so that you get a reasonable balancing.
The charging voltage should be below the specified 52.5 V per DVCC … never higher. That is already very close to 3.55 V for a cell high voltage alarm … It’s better to stay at 52V and raise it manually to 52.5V from time to time …
I manually switched to inverter yesterday for one hour. Battery voltage is now 52.44V and the highest/lowest cell voltage is 3.484/3.504V. Apparently the Pylontech BMS settings were agreed on between Victron and Pylontech, they cannot be changed in VE Config. My concern is the sudden drop from 52.xV to 48.xV when switching to inverter and running a kettle, leading to a “low battery” warning on the MPII, something which never happened when the battery was discharged to ±75% almost daily. As soon as the kettle is switched off the battery voltage will increase slightly to 49.xV, remaining there for the rest of the hour.
Why don’t you post your VE Configure Config here … one voltage will be set too high …
How do you use the mains/Grid connection … do you always stay connected to it or are there high and/or low tariffs where you have to go OFFgrid? No PV etc ?
Just charge / discharge via Multi …
I can’t even access the system via VE Configure, all settings are greyed out and taken care of by the Pylontech BMS. The system is permanently connected to the mains, only providing backup power to lights, fridge and plugs during power cuts. No PV.