Chargeverters

General Troubleshooting

Last Post by EG4 Eric 1 week ago

8 Posts

2 Users

0 Reactions

89 Views

RSS

Posts: 4

Powelljn50

Topic starter

February 7, 2026 4:58 pm

(@powelljn50)

Active Member

Joined: 9 months ago

I have EG4 off grid system consisting of 1 Flexboss21, 2ea 280 AH wall packs, 2 chargeverters, solar and a 13 kw kubota generator. Both chargeverters and batteries are connected to a 400 amp busbar. 1st chargeverter is communicating through RS 485 with Master battery and charging according to SOC and starting generator at 20% SOC through NO consctacts. Second chargeverter will not communicate with slave battery. What the best way to set up the second chargeverter to coordinate charging. Any help would be greatly appreciated

Jim

7 Replies

Posts: 1035

EG4 Eric

Admin

February 12, 2026 10:54 pm

(@eg4eric)

EG4 Online Support

Joined: 1 year ago

Are you communicating both batteries with the inverter?

Usually, the batteries can either communicate with the inverter or the chargeverter. you will need to either need to the chargeverter to charge by voltage or set the inverter to operate based on voltage.

4 Replies

Powelljn50

(@powelljn50)

Joined: 9 months ago

Active Member

Posts: 4

February 16, 2026 7:39 pm

Reply to

EG4 Eric

@eg4eric

I have batteries paralleled and communicating. The RG485 is connected to the 1st chargeverter annd master battery. It is set to start generator through N/O contacts to charge at 15% SOC. The other chargeverter RS485 is connected to the second battery with charge on/off set to voltages. The CAN port is connected to the Master battery and Flex21 Both batteries and chargeverters are connected to a 600 amp buss. Is there any way to get the second chargeverter to charge by SOC to copy Master battery ? Should I connect the chargeverters in a different configuration?
Thanks

EG4 Eric

Admin

(@eg4eric)

Joined: 1 year ago

EG4 Online Support

Posts: 1035

February 18, 2026 5:44 pm

Reply to

Powelljn50

@powelljn50

If the batteries are communicating with the inverter, you would need to set the Chargeverter to charge the batteries by voltage. Since the batteries cannot communicate with both inverter and Chargeverter at the same time. Having everything connected to bus bars is correct.

Powelljn50

(@powelljn50)

Joined: 9 months ago

Active Member

Posts: 4

February 21, 2026 4:23 pm

Reply to

EG4 Eric

@eg4eric

Thanks Eric,

I have the master battery communicating with the chargeverter through the RG485 port and the Can port on master battery to the Flex21. The second battery and chargeverter are connected through the RG485 port, set to voltage and linked to the master battery through the battery com ports. What would be the correct voltages to set for start and end charge if looking to start at 15% SOC and end at 100% SOC? Thanks much

EG4 Eric

Admin

(@eg4eric)

Joined: 1 year ago

EG4 Online Support

Posts: 1035

February 23, 2026 9:57 pm

Reply to

Powelljn50

@powelljn50
Because your batteries are communicating with the inverter already, there is no need for the communication cable between batteries and chargeverter.

For 15% the battery voltage would need to be set around to around 49V-50V and 100% would be at 56.2V

Posts: 4

Powelljn50

Topic starter

February 16, 2026 7:52 pm

(@powelljn50)

Active Member

Joined: 9 months ago

For consideration: Flex-boss 21 would be better served if it had a way to start a generator or manage multiple chargeverters in an off grid scenario, without buying a GridBoss.

1 Reply

EG4 Eric

Admin

(@eg4eric)

Joined: 1 year ago

EG4 Online Support

Posts: 1035

February 18, 2026 5:51 pm

Reply to

Powelljn50

@powelljn50

Thank you for the feedback. I’ll be sure to share this with our team. The FlexBoss is designed to be installed alongside the GridBoss, though it can operate as a standalone unit. When used on its own, you cannot connect the generator to the inverter. Other than that, it will work as an inverter like the rest of them.

Chargeverters

Stay Connected

Quick Links