Multiplus II + 4* US3000C - Low Battery Voltage

Hi Community,

for 3 month i run 3* Victron Multiplus II + 3*US3000C. Firmware Version of all the Multiplus II is 502; Cerbo GX is v2.92 and Pylontech 1.7 (was already running 1.8).

The System run without any issues for the last 8-12 weeks, but since Monday evening I get “low battery voltage reported” and this in all flavors: At 52.00 Volt, at 51.50 Volt and at 49.00. Sure, the whole bandwidth is included.

I did a lot of research, thought one out of fours Pylontech (or even more) are defective, so connected all of them individual, but the issue remains.

I did a complete reset and fresh install of all Multiplus II, same behavior. As soon the MP2 come up proper, Low Voltage gets reported on Multiplus II Phase I (so the first one out of three).

I connected a Power Supply and started at 52.00 V. As soon all Multiplus II are up and running, the Voltage drops from 52.00 V to 45.00 V. Goes up again and down, until a Relays? Disconnect the input for a while.

Anyone knows or had a similar problem before?

Thanks and best,


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