March 17, 20215 yr Noticing more if these posts and users not aware of balancing the batteries first. Maybe this can be pinned somewhere. This is what I did when adding a new US3000C battery to my existing US3000B battery bank. Pylontech should include this in their manual. Step 1 charge existing battery bank to 100% SOC. Step 2 disconnect existing battery bank from inverter. Step 3 connect new single US3000C battery to inverter and charge it to 100% SOC. It comes shipped at 50% SOC. If more than one new battery is added, first balance these together and then connect it to inverter and charge it to 100% SOC. Step 4 disconnect new battery from inverter after 100% SOC is reached. Step 5 connect new battery to existimg battery bank and wait for them to balance each other. Not connected to the inverter yet. All led lights should go off and battery should go into standby when this is achieved. Mine took less than 20 minutes as they all were at 100% SOC. Step 6 connect the full battery bank to the inverter making sure that that the new battery is the master.
March 17, 20215 yr I would also add if using the CANBus for communication (e.g. for Victron inverters) - the cable has changed from a TypeB to a TypeA.https://www.victronenergy.com/live/battery_compatibility:can-bus_bms-cable
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