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Regarding CAN bus regulated charging.

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Thanks all for the Feedback.

FYI ... i have 4S8P CALB 100's

I figured it maybe my REC settings and have since tweaked them. I have posted the current settings for review.

I did originally have End of Charging at 3.55 and Cell Max was at 3.6. ... but i've moved it down to 3.5 now.

DVCC is activated

BTW .. Al & Rick at Wakespeed have been great at supporting me ..

I will apply the 2.5.0 today.

Where can i get the REC updated firmware and Release sheets ??

cheers ... from SV Tahnee Mara

Uploaded files:
  • settings.png
Quote from Damian Raffell on August 2, 2022, 4:26 am

I believe i am experiencing something like this as well.... ?

FYI. I have ABMS, wifi, LCD, Balmar XT170, WS500, Cerbo GX, Victron Multi's and Victron MPPT x 4 all CAN or VE connected.

With the alternator charging.. when i get to , around 98% SOC, the current still keeps creeping up until the BMS charge relay opens.

With my Solar and Victron chargers this does not happen.

I have reported this to Al at Wakespeed. He has sent the new firmware. ... but i am not sure if in need a Victron Cerbo FW update as a pre req,

also, I am on ABMS FW 2.6 where / what is 2.7 - cant see it on the REC site ?

thanks

 

Here are some settings you can try:

End of charging  AND Balance voltage END= 3,55V

Balance START voltage = 3,50V

MAX allowed Cell Voltage = 3,8V (yes this is high but you dont want to cut charge relay unless there is an critical situation.

 

 

Quote from Trond Arvid Røsvik on August 3, 2022, 9:19 am
Quote from Damian Raffell on August 2, 2022, 4:26 am

I believe i am experiencing something like this as well.... ?

FYI. I have ABMS, wifi, LCD, Balmar XT170, WS500, Cerbo GX, Victron Multi's and Victron MPPT x 4 all CAN or VE connected.

With the alternator charging.. when i get to , around 98% SOC, the current still keeps creeping up until the BMS charge relay opens.

With my Solar and Victron chargers this does not happen.

I have reported this to Al at Wakespeed. He has sent the new firmware. ... but i am not sure if in need a Victron Cerbo FW update as a pre req,

also, I am on ABMS FW 2.6 where / what is 2.7 - cant see it on the REC site ?

thanks

 

Here are some settings you can try:

End of charging  AND Balance voltage END= 3,55V

Balance START voltage = 3,50V

 

MAX allowed Cell Voltage = 3,8V (yes this is high but you dont want to cut charge relay unless there is an critical situation.

 

 

Thanks for the input .... appreciate  it ...

What difference will raising the Balance Start V make ??... i thought it was best to lower it ??

CALB Max cell V is 3.65 .... i would be a tad nervous setting 3.8 ...

I have today updated the WS500 to 2.5.0 - i am at anchor now - but all seems good with a quick Engine / Alt / REC  test ..

.....

 

All,

 

Wakespeed WS500 ver 2.5.0 was released Monday -- but it might take a bit to get posted to the website.  For all's convenience, I have attached the .dfu file and the companion config guide.

 

Website should be updated perhaps early next week.

Uploaded files:

Damian,

Trond makes a very good point here.  3.65 V is the maximum "working" voltage, but the maximum safe voltage is usually quite a bit higher.  You do not want to perform a hard trip unless you really really have to.  Keep in mind that once you are above 3.5 V cells becomes very sensitive to upward voltage change, even with little current change as per the red line in this chart, so there may be occasions where if you have not balanced in a while, one or two cells will get out of the flat portion of the curve early and require some serious top balancing, especially on lower grade cells.  You need to let the system work to bleed off that extra capacity on those cells, but if you just perform a trip you will get into this endless cycle of trip/balance.

https://external-content.duckduckgo.com/iu/?u=https%3A%2F%2Ftse3.mm.bing.net%2Fth%3Fid%3DOIP.kVyPodGVArkeR4R3rAerzQHaDZ%26pid%3DApi&f=1

Trond Arvid Røsvik has reacted to this post.
Trond Arvid Røsvik

Damian:

Having an low "start balance" will only make the charging prosess longer.

As Rick says, recomended working voltage is up to 3.65V

Even if you do reach 3.8V for a few seconds or even minutes, its not critical for your cells.

 

AL: The .dfu file file did not get uploaded?

 

 

 

 

Just want to add there is an huge improvement in the A-BMS V2.8 on how the charging is regulated.

No more jumping up and down of the current in last phase of charging.

 

Just be aware there is an new setting now called CFVC that dictates the Float voltage.

By default this is set to 0, and then it will never go in to float.

 

Uploaded files:
  • CFVC.jpg
Al Thomason has reacted to this post.
Al Thomason

This is the settings I am using. (4S 1000AH Winston).

This gives "Bulk/Absorption" 14.2V and Float 13,5V, same as Victron recommendations.

 

"cmin":2.8,"cmax":3.8,"tmax":55,"bvol":3.55,"bmin":3.5,"tbal":55,"tmin":-10,"capa":1000,"char":3.55,"ioff":0,"chis":0.2,"razl":0.25,"maxh":0.2,"minh":0.1,"bmth":5,"ioja":0.019531,"soch":0.05,"op2l":2.9,"op2h":0.2,"re1l":3.8,"re1h":0.2,"chac":0.6,"dchc":1.5,"maxc":350,"maxd":350,"clow":2.9,"socs":0.999159,"cycl":71,"chem":3,"strn":1,"re1t":369106585,"op2t":1353318461,"re1v":3.50119,"op2v":0,"cfvc":0.8.

Trond Arvid,

That is such great news to hear -- we can do only so much 'in the lab' even with live test benches, to hear your comment from actual field install is really nice.  Thank you (I am sure you can imagine, mostly only hear complains, very rarely the resolution!)

For reference we posted WS500 v2.5.0 firmware officially on the Wakespeed.com website a few weeks ago; it should also be available from the Wakespeed app and I do believe OGSS has updated their tool also as well.  Last week Victron also officially released Cerbo v2.90 which includes WS500 integration and reporting, including via VRM.   Lots happening!

Some new features which might be of interest in the 2.5.0 release include a new 'Hard Stop' voltage limit to force a load-dump/high battery voltage fault -- independent of what the BMS is asking for.  The Ws500 has a hard-coded high voltage limit of IIRC around 18v (scales with system voltage of course).  A bit high for Li installs, so a new parameter on the $CPB line lets one defined a more restrictive value --  maybe 14.6v?   14.8v?  to trigger the hard FLT #13 (High Battery Voltage).

 

 

 

 

 

 

Trond Arvid Røsvik has reacted to this post.
Trond Arvid Røsvik

Hi AL.

Yes I am running WS500 V2.5 and Venus OS V2.90 already.

 

That hardcoded overvoltage used to be 16.2V in 12V system.

I know, as I have an client with 3.7V nominal cells, he was trying to charge to 16.4.

We fixed that by setting system to 1.1 I believe.

Good to see this is user adjustable with the $CPB now.

 

And also great with Victron integration, I just noticed they now implemented Engine/Alternator speed and Field% to the Log.

Uploaded files:
  • WS500.jpg
Adam Sherman has reacted to this post.
Adam Sherman
Quote from Trond Arvid Røsvik on September 27, 2022, 1:05 am

Just want to add there is an huge improvement in the A-BMS V2.8 on how the charging is regulated.

No more jumping up and down of the current in last phase of charging.

 

Just be aware there is an new setting now called CFVC that dictates the Float voltage.

By default this is set to 0, and then it will never go in to float.

 

Is this taken from a new manual? I emailed REC about getting a firmware update for my serial number but haven't heard back. Care to share the new manual?

Yes, V2.8 comes with an updated manual.

If you have an A-BMS, send me your e-mail some how, and I will send the files to you.

Don't want to post my e-mail here in case I get flooded with requests.

 

Q-BMS is serial specific but in A-BMS its not.

There are however some specific hardcoded FW settings so the best is always to get it from REC.

Why they have done it so complicated is beyond me.

There should be an portal where you enter your serial, and what kind of specifics you need and then it generates an file.

mine is my username at gmail .com If you want to send them over. I sent REC an email but still waiting, but would be nice to review the manual for any changes.

Thanks!

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