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Topic starter
May 6, 2025 6:51 pm
We are having communication issues between our customer’s LG-EM048126P3S7 battery BMS and the EG4-6000XP. Our customer has (2) EG4-6000XP's in parallel (paralleling cable used), each with (2) LG-EM048126P3S7 batteries in parallel. Please note that the batteries are not shared between the inverters.
At a high level, the lithium ion LG batteries are not currently supported with their own charging profile in the EG4 inverters. The batteries accept full charge current when using the EG4 lead-acid charging profile, but the lack of a CAN 2.0B protocol handshake and heartbeat from the EG4 inverter RJ48 battery terminal causes the LG BMS to disconnect at 11 minutes. Could you review the following details on the charging requirements for the LG batteries and let me know if there is an existing lithium ion charging profile in the EG4-6000XP that could be used and, if the custom RJ45 cable required by the LG BMS will work with the EG4?
LG-EM048126P3S7 Battery Charging Requirements:
Nominal Capacity: 126Ahrs
Nominal Energy: 6.5kWh
Nominal Voltage: 51.8V
Operating Voltage: 42 to 58.8V
Floating Voltage: 57.4V
Maximum Charge / Discharge Current: 63A
Maximum Charge / Discharge Power: 3.3kW
Continuous Charge / Discharge Power: 3.0kW
Round-trip Efficiency: 95%
Ingress Protection Rating: IP20
Cooling: Natural Convection
BMS Communication Protocol: CAN 2.0B
LG BMS RJ45 Cable Requirements:
CAN_L: Pin 2
CAN_H: Pin 7
GND: Pin 5
Must have 120ohm resistor between CAN_L and CAN_H
EG4-6000XP RJ45 Pin configuration:
CAN_L: Pin 5
CAN_H: Pin 4
Result: We will be making a custom cable that crosses Pin 2 on the LG BMS side with Pin 5 on the EG4, and Pin 7 on the LG BMS side with Pin 4 on the EG4. Additionally, there will be a 120ohm resistor installed between the CAN H and CAN L.
Questions:
- Can we either use an existing Lithium Ion battery profile in the EG4, or can we define one that will work for the LG batteries (both power and CAN 2.0B protocol communications)?
- Will the custom cable described above work with the EG4 Battery comm?
Topic starter
May 12, 2025 4:33 pm
@EG4 team, I have had this question submitted to you directly since April 21st, and the above a week ago. NO RESPONSE!!! This is frustrating. If you need more details, let me know. Right now I am not at all happy with your customer service!
May 12, 2025 9:33 pm
@fsisson
Apologies for the delayed response. I hadn’t seen your other posts. Please know that we do our best to respond to every post as quickly as possible.
Here is a list of batteries that are compatible with the 6000XP for closed loop communication. If your BMS can be configured to use one of these supported protocols, there may be a chance to establish communication between the inverter and the batteries. Otherwise, the inverter would need to be set to Lead Acid mode to manage charging and discharging based on voltage.
