How to connect Multiplus GX & EPEVER 48V 100Ah Lithium Battery

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1

Hi,

I try to connect my Multiplus-II GX (48/3000) with a Rack-mounted EPEVER 48V 100Ah Lithium Battery (LFP4.8KWH48V-P20R3) via CAN-Bus without success so far. I know that these two companies are competitors and intercompatibility is not their main focus. But maybe someone has tried something similar or maybe there is a way to get the communication running between the battery BMS and the Multi by using some standardized CAN-Bus procedure or protocol? I just tried the cable delivered with the Battery and not tried Victron Energy VE.Can zu CAN-Bus BMS Typ A or Typ B cable so far - I didn’t know which one to choose.

Thanks for any help about this issue.

2

Hi did you read this:

There is some info on “unsupported” batteries in there

3

I’d try the type A or B pylontech / Victron CAN leads to see if they work. Will most likely come up as a pylontech battery, with 500kb/s CAN data rate.

4

I’ve tried both cables (Type A and B) and tested both with 500kb/s CAN and 250 kb/s CAN but my Multi GX didn’t get any connection or data. Did I do somethin wrong? or is there any special setting?

5

Are you sure the pinout of your cable on the battery side is right?

6

Hi Marc,

thanks for the hint. the Battery-Manual is stating the pinout given below - it is different to type-A and type-B cable - so I Have to configure a cable by my own?

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7

The type A cable would probably work, but its better to fabricate your own, that also connects both GNDs

8

GND is different to what the EPEVER Battery needs - so no Victron Cable will work here - or did I have some misunderstanding here?

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9

The GND is not strictly necessary for Can to work, theres lots of Can devices that only use the high and low signals. But i see further up that you already tried both types, so then you need a custom cable

10

Yes that explaines why its not working, you will have to make your own custom cable, sometimes GND is not connected because it can create data issues (gnd loop for instance)

11

How likely is it that the problem is caused somewhere else - strange CAN data rate or something like this?

12

No i dont think so, pinout is different on your battery than the standard victron cables, so if the battery communicates like pylontech it would probably work with your own cable

13

There should not be any strange datarates, BMS-Can is pretty much all the same nowadays, but check the battery manual.
Can High and Low cold be crossed, but that would be strange on premade devices.
Its worth checking the bus termination, so either end needs a 120Ohm resistor. With both battery and GX powered off, you should measure 60Ohm between Can High and Low. If its 120Ohm, then one termination resistor is missing

14

Today I crimped a special cable but still got no connection. The Multiplus GX should directly show the Battery within the menu if there is a connection or did I need to activate a certain option first?

15

It should, yes.

Have you checked the things above?

16

Does the battery have any dipswitches you have to set?

it is still possible that your battery is incompatible with victron…

17

Did you set this:

https://www.epever.com/download/bms-link-communication-protocols-fixed-id/?ind=1744624546535&filename=BMS%20Communication%20Protocols%20&%20Fixed%20ID-EN-V1.4.pdf&wpdmdl=22913&refresh=68a6a84b13bcb1755752523

18

These are all battery manufacturers. Sounds like a compatibility list for Epever inverters, so the wrong way round

19

Hmm yes i believe you are right :grimacing:

Also i cant find anyone who has this battery working on victron

20

Hi Marc. how did you find the Software-fix? This is not shown at the product page. I will try to connect the battery via PC and check if I can make a firmware update.
This batterry has dip-switches but I guess these are not linked to the CAN-communication or what do you think?

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