Since I haven't done anything to the system other than go sailing today, would they most likely issue be corrosion?  I'm assuming to solve this. I would just need to go through the system loo...

When you have a large error its usually one of three issues. You made an adjustment to the shunt zero offset parameter A shunt wire was mistakenly touched to a battery cell voltage and it burned ...

My REC Active BMS is reflecting 240-250A of charging into my LiFePo battery system, however there presently no sources of charging active in my system (no shore power and my engine is off). My Vict...

@Kevin voltage sense not connected it will not work. This is not a fault in the firmware. As my understanding and chats with designer from WS500: It is by design, reason, to only use the CAN vol...

Is the baudrate set correctly? In the app, manual communication type: CANS? What value comes back? Should be: 2  

So it turns out the problem is that the Battery Sense wire (Red with Yellow Stripe) was not connected.  If I connected this to the battery, the CAN communications work.  I didn't have it ...

I've done some more testing.  I've reset the WS-500 to factory defaults where it is set to a simple starter battery and no BMS.  It still reports the same error " BMS connection via CAN"....

Hey Kevin, I thought that Wakespeed had this fixed with version 2.6.1.  I am going to include both Tine from REC and Al from WS to see if they have any insight but you may need to put in a su...

I have a WS-500 Pro with the latest version (2.6.1) of firmware as well as a ABMS with the latest version (2.9.7) of firmware.  I'm trying to get the CAN communications working between the two...

We have created a custom AI agent to help with REC BMS setup, troubleshooting and configuration. As of January 2026 it's still in Beta, but hopefully it helps. Feel free to let us know if you hav...

The Master has been updated for 2026: supports multiple configurations without the need for a firmware update supports custom Tasks using the wifi module improved connectors to match the new 2...

I am not sure about the top two, but as I recall, the bottom are your TTL Bootload pins.  By way of this reply I am including Al from Dragonfly.  I am sure he can help. @Al 

By chance, are RX and TX available on the board? Possibly J2, the two pads labeled TERM? Or P1? Before I get me scope out, I was hoping that someone knew. Thanks! Ezra 

Upgrading energy systems can be tricky, especially when switching to lithium solutions like the Arco Zeus. This forum discussion dives into practical tips, user experiences, and performance conside...

Hey Ben, thanks for the reply. Here is a screenshot of my REC home page. This is a 24V start battery, so 2x13.36=26.72. My SOCH = 0.05. Cell difference is typically 3-7mV. I have about 0.3A of drai...

@Bill C. Your Float setting is 26.8V. (13.4 in 12V system:)) restart to bulk is triggered if voltage comes below 26.72 AND by setting: SOCH end off charge hys(in%) standard from fact...

Hi everyone, I've set up and have been using successfully for 1 1/2 years with no issues a REC Q BMS (firmware 1Q-4000+, manual rev 2.9.0 Jan 2023) for my 24V CALB 230 cells LiFePO4 battery bank (...

Earlier I had asked Grok to compare the 2.6.0 docs to the 2.6.1 version wrt to changes realated to REC BMS. I should have posted that convo as well:  Changes to Support for REC-BMS in Wakespe...

@Bill C. This pretty much matches with what I understood they were.  I didnt see it but it also seems to have fixed some REC BMS connectivity issues. Thanks for posting

If you get a chance to review the above, let me know if you find any errors that Grok has made. Thanks!

Continuing with Grok, I asked about DVCC support changes, and support for CerboGX. Changes and Improvements to VE DVCC Integration in Wakespeed WS500/WS500-Pro Firmware v2.6.1 VE DVCC (Victron En...

I asked Grok to: create a table of changes from 2.6.0 to 2.6.1 firmware version. I am still checking to see if Grok's answers are correct.  Changes from Wakespeed WS500/WS500-Pro Firmware v2....

I just noticed that the Wakespeed has released new FW: 2.6.1 along with an update to their Comm and config docs. There is also an update to the Android WS app.

1)  Yes, the REC Active BMS cable includes an end of line terminator in the DB9 housing but keep in mind that in order to increase reliability you need to have a terminator on the two furthest...

We were recently asked by a customer what the charge setting would be if he wanted to lower the voltage settings on his BMS to increase its life span. Although this is possible it is not something...

@Neil Good question, and I believe the answer is yes, we just need to have the address of the second BMS changed to another number.  Default is (2).

As a bit of a follow-up is it possible to run 2 abms through a single wifi gateway?

1) I am integrating a LFP ABMS based battery with Cerbo GX and WS500 already in the system.  I would like to confirm that the REC Victron CANBus cable is internally terminated and it is suffci...

Interesting thread on the whole ZEUS vs REC Active BMS sync issue — amazing how many small details can affect a system’s stability. Speaking of dealing with technical stuff, I recently ...

@Rick Thanks for the pointer to the git repository. I am a tech guy, but hesitant until it's fully tested to put stuff like this on our boat, unless it's a system that I can live without.It wi...

You don't mention if you need to integrate your BMS with a Victron Cerbo or Wakespeed WS500.  The Active BMS is typically for standalone applications and Victron only allows one primary DC sou...

I've been contenplating installing two seperate 12V LiFePo4 banks rather than just one. What would be the best way to do this with REC BMSes?  I know there are the 2Qs, but they seem to be for...

Hey Steve, to expand on what Ben is saying. Your BMS is in "Balance" mode as per the Green LED, The system controls to the highest cell voltage so it is that one keeping it from fast charging unt...

@stevehmick led flashes? error 3: did you checked manual? To big unbalance, also your screenshot shows unbalance. What is the setting, max allowed unbalance? Something is charging the battery? ...

Hello.  I am trying to troubleshoot my rec active BMS.  I have been off of the boat for 2.5 months and when I got back my house bank (840ah lifepo4) was at 85%.  The BMS did not have...

It looks like you have one cell that is either bad or has got badly out of whack. Before you swap cells heres a few ideas. First I would make sure your cell tap wires and bus bars are all retorque...

Hello! First time posting but I have had (2) 2Q series BMS for a while now, both running separate 48v 500ah systems. It seems at this point that either the batteries have haywire cells that the BMS...

1.29 has made everything better.  These regulators are now smooth like butter!

It seems from this thread https://ogm-energy.com/community/ogm-user-forum/topic/154310/new-rec-bms-and-victron-cerbo-dvcc-integration-guide that the REC-ABMS now support VE.CAN. I would be very gr...

I'm on 1.28 and DVCC was working, but no longer.  I've got my dvcc currently limited to 12 amps charge current, but the Zeus regulators both want to follow the REC current limit of 240a.  ...