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Anyone know the correct cable to connect the EG4-LL V2 server rack batteries to the Cerbo GX? There is a CAN bus and RS485 port on the battery. Signature Solar has a video o them doing it. They say in the video you need a modified cable to do it, but don't give any information about the cable.
I got this working today. I was worried that it wasn't possible because I haven't found much helpful documentation out there, but now that it's working I'm happy with how it works.
I bought this cable from Signature Solar. https://signaturesolar.com/victron-communication-can-bus-cable-for-eg4-ll-batteries/. I'm not sure if this cable is special, but I tried a regular CAN-bus cable and a regular ethernet RJ-6 and couldn't get those to work.
Plug one end into the CAN port on the master battery (after setting the inverter protocol on the master battery), and plug the other end into the BMS-CAN port on the Cerbo. I could only get it to work in 1 direction, not sure if cable direction is a requirement (?). Also on the Cerbo, I kept a CAN-bus terminator plug in the other BMS-CAN port. Not sure if that's required but it's working and I haven't tried to remove the terminator.
Once it's working, the Cerbo sees it as a Battery Monitor device, and it appears to control charging voltage(s) properly according to the settings in the manual.
I tossed my smart-shunt into a big box of other Victron stuff I now longer need ;)
No more Shunt, EG4-LL is a "Device" (battery monitor)
Not even as a backup device to confirm the EG4 voltage, current and SOC? You could always leave it disconnected from the cerbo and access it via Bluetooth.
1 more toy to play with....;)
I’ve got 2 batteries right now and both show up in the Cerbo. In the Cerbo I can see that there are 2 battery modules online. I don’t think you can see individual cell voltages and SOC. The aggregate SOC seems correct. Overall it shows more of the BMS info than I expected. I bought the 6-slot rack so will probably just fill the rack with 4 more batteries now that I’ve seen it working.
Hey, Are your EG4-LL V2 sending "High voltage alarm" warnings to Victron @ 100% SOC? I got EG4-LL version one and it is working except getting warnings. Please see my post on DIYsolarforum. Thanks
https://diysolarforum.com/threads/please-help-eg4-ll-v1-with-updated-victron-firmware-generating-cell-over-voltage-at-100-soc.58723/
https://diysolarforum.com/threads/eg4-ll-v1-sending-high-voltage-alarm-warnings-to-victron-100-soc.55542/
The cable from Signature Solar (https://signaturesolar.com/victron-communication-can-bus-cable-for-eg4-ll-batteries) is $9.25 with pins 4 & 5 on the battery CAN port going to pins 7 & 8 on the Cerbo GX BMS-CAN port. One direction only. You could make one in a pinch with standard RJ45 ends. My problem is that I have 3 of my EG4-LL v2 48v batteries but it only shows the Amps and Watts for the Master battery. The voltage and percentage are correct because those are essentially synced between the 3 batteries. The cerbo detects that 3 batteries are connected and shows that in the setting so I believe the communication through the COM In/Out ports to the other two batteries is working correctly but it does not appear that it sums the watts and amps for all 3. My SmartShunt shows the totals just fine and I am using it as my default battery meter but I'd prefer to use the EG4 for better accuracy if it worked correctly. I pinged Signature Solar about it last week but have not heard anything back yet.
I bought the same cable and it seems to work. I've got (2) V1 12v/400ah and (1) V2 12v/400ah. I've got an interesting thing going on, my battery % is showing 194+%. Checked and re-checked everything. It's also only reporting that I have 600ah total. I've reached out to Signature Solar today and I'm hoping/waiting to hear back. I've seen on YT that Signature Solar/EG4 and Victron are working together so it's nice that this is working. Honestly thought it'd work a little better out of the box but it does take time to figure out the bugs.
Thanks everyone for providing information. I had three EG4-LL Version one connected to cerbo gx and using smart shunt and everything has been working. I recently updated the EG4-LL V1 firmware and it appears that the cerbo gx is talking to them (as mentioned above). Should I now remove the Victron smart shunt? And is the cerbo gx now ignoring the data provided by the smart shunt? Thanks in advance for your reply. Here are two photos of my setup but they photos aren't showing the communication cables going between the batteries and the cerbo gx.
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