2x AC300 Split Phase Performance

Product Discussion BLUETTI Apex & AC Series
1

I have 2 AC300s connected via communication cable and using a Split Phase output cable to get 240v to breaker panel. Both AC300s have 2 B300K batteries that give me over 10KWh and a max output of 6Kw to the house.

The issue is the output of each AC300 is grossly unbalanced. The master AC300 is outputting 3x as much as the slave. I recently did a backup power performance test, running all my household 110v circuits. The load on the master was about 2000w and the slave load was 500w. I then turned on the toaster oven and it tripped the 30A breaker connected to the split phase cable, which tells me I will never achieve the 6Kw potential of the system.

How can this be fixed? Is there a setting in the AC300 to balance the load?

2

Here are some important points to consider:

  1. Please check whether the input current of the two machines is consistent.
  2. Please reset the AC output voltage of both AC300 units to be the same.
  3. Please also ensure that the UPS mode of both AC300 units is set to the same configuration.
  4. Verify whether the AC output sockets on both AC300 units have separate loads connected. The load connected to the AC output socket can only be handled by the respective AC300 unit.
  5. When connecting to the distribution box or P030A, only the 240V socket/circuit breaker should be shared by both AC300 units, while other 120V sockets/circuit breakers should be powered by one AC300 unit. If the 120V loads on both ends are inconsistent, it can lead to an imbalance in the SOC/output power of the two AC300 units, so it’s normal for there to be differences in SOC/output power.
  6. When setting up a dual hot wire connection, only the 240V load can be shared by both AC300 units since one AC300 provides one hot wire (120V), and the two machines provide a combined 240V. Therefore, when powering 120V devices, please try to ensure that the loads on both AC300 units are matched.
3

Both units are connected to the Split Phase Output Cable that goes into a 30A dual pole (240v) breaker. All configuration settings are the same on each unit.