Hello,
I built a 3 phase configuration in my camper with 3 Multiplus 24/3000 and 6 Lithium Batteries with internal BMS.
I did a test and did not supply any external power to discharge the batteries to their own minimum (so the internal BMS would shut down due to undervoltage). After power shutdown, I connected shorepower to recharge via one Multiplus (3phase out, 1phase in). This did not work due to the fact that the Multiplus Master did not start up properly because it was missing his slave untits. The units were not provided with any power since batteries were shut down by their internal BMS. So it seems I managed to run into a deadlock.
I solved the issue by using an external 24V charger to bring the batteries back to life so they finally provides some voltage for the Multiplus Set to boot up.
Anything I missed out here? Is there any way to get this configuration back to work without external charger?
I am also now working on a system upgrade to prevent complete battery drain by switching off the 24V / 12V section by a SOC controlled shut down (this should be doable with the Cerbo).
Best Regads