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EG4 to Victron Cerbo over RS485?

paticus said:
I have a V2 EG4 12v 400ah battery. The manual and front panel show RS485 ports on the front. Can I connect that to the Cerbo GX to get Battery monitor information into my VRM?

Battery: https://eg4electronics.com/categori...wer4-12v-400ah-lithium-iron-phosphate-battery

All of the tutorials online are using their 24v and 48v version that have a CAN BUS port.
Click to expand...
You will first need to find out what BMS the battery uses, and whether it will do comms on the RS485 port. Then, the following driver needs to be added to the Cerbo, if the BMS is supported (see the list therein):

github.com

GitHub - Louisvdw/dbus-serialbattery: Battery Monitor driver for serial battery in VenusOS GX systems

Battery Monitor driver for serial battery in VenusOS GX systems - Louisvdw/dbus-serialbattery
github.com github.com

Requires some Linux skill, but someone here may be able to help.

Also requires a proper cable. I think SS may have one. You will need to ask about that too. Once you know what brand, we'll have a better idea if it will work.
 
Last edited:
paticus said:
Thanks I’ll dive into this @cdsolar
Click to expand...
I think you are in luck. Looks like dbus-serialbattery explicitly supports your older EG4 Lifepower:

github.com

Add EG4 Lifepower driver by dchiquito · Pull Request #212 · Louisvdw/dbus-serialbattery

Fixes #137 Marking as draft pending more complete testing. I've tested this locally on my laptop with a EG4-LiFePower4 | 24V 200AH, but not on an actual Venus OS installation or any other EG4 batt...
github.com github.com

As this driver is 1.5 years old, there is a reasonable chance it will work with your older battery, but no guarantees.

Here is discussion about it in this forum:
diysolarforum.com

Decoding EG4 Lifepower4 BMS data

Has anyone looked at the serial stream to decode the data before so I can write a very simple serial to TCP program to query the battery data? I'm using a RS485 + RS232 to Ethernet/Wifi adapter and installed a virtual com port in windows while logging the communication between the BMS...
diysolarforum.com diysolarforum.com

Now you just need the right cable, or build one. Ask Signature Solar.

It appears to be a Narada BMS.
 
Here is a cable that may work. You'd also need an adapter to take the usb-c of this cable to the Cerbo.

Again, no guarantees, but I have said cable to monitor my EG4 LLv2 48v battery. If they didn't change the pinouts, then this will probably work.


signaturesolar.com

EG4 USB Read/Write Cable

Signature Solar provides solar panels, off-grid solar systems, grid-tie, and hybrid systems. Quality solar inverters, bifacial solar panels, complete solar kits, solar batteries. Featuring brands such as EG4 Electronics with their solar battery, LifePower4 and EG4 LLifePower4 and EG4 LL
signaturesolar.com signaturesolar.com


 
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