I can for an short period see that it does see the data from REC, for an blink of an second. But only for like 1% and then 99% it does not sync.  It even messes up the communication between ...

Has anyone found an solution here?  Just swapped my Wakespeed for an Zeus and can NOT get it to sync from the REC BMS. I know the PIN-out is different from WS-500 to Zeus. Zeus and Cerbo ha...

I do agree 100 % with @Peter Domenicali and think that the corrected sketch he uploaded is correct. Thank you Peter for putting so much effort in. Nevertheless I would wish that either Rick ...

@Rob Just to be clear, while I am certain about what I am showing in the Diagram PDF that I uploaded 17 hours ago, OGM Energy, represented by Rick, must be the final arbiter. After all, they are yo...

Martin, in his original posting above, correctly identified the wire colors and meanings connected to the DB9: Pin 1: Black cable = Shield Pin 2: Gray cable = GND Pin 3: Green cable = RS485 Sign...

Hi Rick and Rob, With all due respect, Rick, I believe you have the two "+5V" lines mixed up. Looking at the product manual from REC, the pins are all clearly described, and I have verified the wi...

Just updated DB9 pin numbers and added a Slave to slave pinout section to the Master Slave Pinouts diagram.  Thanks to PeterD for catching it.  You can download it here: https://rec-bms-...

@tom look under devices/rec/pArameter/CVL. I think here you see 13.4 /13.3 means REC send a float voltage to your charger. This means bulk 14.0V was finished. If battery is discharge to 95%, it w...

ben,  i put your settings in exactly.   now it stays in absorbsion at 13.32v at 98 percent     i must admit, i am getting confused.   

Ok, I found something curios.force tach mode is "3"set it to "1" and then saved/download  to the WS500, but it does not accept this.Changing the other settings is no problem. I am using the O...

Thanks Rick. But as I wrote I have enabled firce tach mode and I tried several values for min field including -1 for automatic detection. unfortunenately this works only for round about 10s after...

and a bit more info from page 68 of the WS500 full manual, release 2.6 Tach Min Field: <WHOLE NUMBER ( 0 à 30 )>  This is the %  value the  PWM  will be kept at &n...

I havent had a chance to play with the recent f/w updates but its likely the issue is that you will need to set a minimum output on the alt. to provide enough of a sine wave for your alt to see.&nb...

Hello,   I have the problem that the tachometer stops working as soon as the BMS sends the "disable charging" signal via CAN.   We have installed a WS500 on a Balmar alternator. The WS5...

@Rick When you get it setup let me know. I think I have what's needed to support the Q series but I don't have one to test. So far I have serial able to read all data points and able to send a...

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@o-firstname  This looks great! There are many hundreds of marine REC users but we don't have an easy way of adding them to this post.  Let me see what I can do.   I have a spare...

Does anyone here use their REC BMS in a marine settig with SignalK? I just finsiehd the serial side of a SignalK plugin for the REC BMS and I need a tester with a Q series BMS.   

another question about float.   is it even  necessary to float lithium batteries?  online it says it is not necessary.  so staying in absorbtion is not an issue or not? &n...

Hey Ryan, We are setting an inhouse demo using a big marine generator as the test system and are just working on wiring and setup now.  This will allow us to try a couple of head to head test...

@Ben I though you had the suggested settings already, seams not yet.   That explains you see 13.69, your system is in float, with a wrong , a bit high float programmed.   I have sent ...

We have also created a REC 2Q/Cerbo Interface manual.  The Active BMS has an update 2.9.5 coming that will standardize commands between the Active BMS and 2Q and in a few weeks and we will upd...

I will make the changes later today. It is 440am right now.  Thank you Soc shows 100 now before I make any changes.   Thanks   Tom

@tom did you make the new settings? After that, switch BMS off and on, to start a new recharge cycle.

@tom your system goes to float when battery reach the voltage 14 -14.2.  If voltage dont go higher as 13.69, the system will not go to float. You need to find out why voltage dont go higher, ...

so a question.  how do you determine my float should be at 3.7 from the settings i have?   also,  my victron multiplus has setting for absorbsion and float but i am assumming th...

i assume this is in balance enough.   it is currently at 13.69v and still in absorbsion charge.   i am puzzled. tom   cell 1    3.444v cell 2    3....

@tom one parameter is missing in suggestion UBDI 0.025 UBDI, factory set at 0.008, accept a slightly bigger unbalance, which will result in a quicker switch to float. Remember if cells are not i...

Any comments on my settings?   Tom

@tom is correct. It is factory setting, if you didn't change it before , it is set ok.

i see now where to check it.  under firmware and the SOCH?    it returns   5 e minus 2 which i think is .05 or 5 percent.   is that right? tom

@Ben  for some reason i cant cut and paste. Balancing end  3.5 Balancing start  3.4 Max allowed delta   .5 end of charge  3.55 end of charge hysteresis  .25...

@tom can you post your actual settings also. This tell straight away or the suggested settings will help you.

@tom     Try these settings:       Settings: Balancing end 3,55 Balancing start 3,45 max allow delta 0,25 end off charge 3,52 end off charge hysteresis 0,19...

@tom 0.5 is typical but you might want to experiment with setting it to zero.  Here is the logic overview for 2.9.4.  2.9.5 may have a few tweaks. Rick Maximum Cell Float Voltage Coeffi...

We just found a potential issue, so it could me a couple of weeks before we can release 2.9.5

can you tell me what the Charge Float Voltage Coefficient should be set at?  it is a 0 to1 setting.  i currently have it at .5, but i am still not going into float mode ever.  

@Ryan Hello,I haven't checked yet because the yacht is on land.I'll write when the yacht is in the water.Best regards,Krzysztof Bosak