Tine, Can you please clarify here. The customer has already upgraded his rev 1.0 HW board to FW 1.5.1. Please clarify what you mean in your last reply 1.0 was only beta, not upgradable ...

Hm, that is weird. I could go ahead with the update but I wouldn\'t want to brick anything or make my life harder. Would rather hear back that I should upgrade even though it says HW:1.0 at this po...

I have just recieved the new firmware from rec bms.

Hi Ben   It looks very nice. Am I understanding it right, that the new CFVC is a user configurable parameter? Is this firmware released?

On a couple off bms I did a firmware update this year before update HW 1.0 SW1.4.1 After update HW 1.2 SW 1.5.3 1.5.3 was the latest firmware at that time. For me it looks strange that ...

Hello Sten, Below is just new information from REC. Some off my suggestions are available in the new firmware 2.8. see below information from REC. ========================== Newest f...

Hello My Wifi module is showing HW:1.0 SW:1.5.1 at the bottom of the firmware upgrade screen. Does that mean I have a beta? I do experience issues with the LCD screen, it is unreliable and so...

I now very well that the hysterese factor is not programable, but I made it that way to see how diferent factors inflict on the calculation. The \" Low end of charge\" is the CVL calculation  \"...

Hello Sten, My posted sheet is part from a bigger sheet.  The bigger sheet make this calculation also automatic. When I have time, I will check what went wrong with my posted xls, probably wh...

Hi   I have made a spred sheet based on the information in Ben\'s spred sheet. It\'s a dynamic spred sheet where end of charge voltage, end of charge voltage hysterese and the factor ...

Thanks. :)

Hello Sten, zip file just 10k, lets try. see below. (update: the forum system dot allow to upload a zip. the pdf below, is a zip-file, please rename after download to  .zip, and then unzip...

Thanks, I would realy like to see your thoughts about the rec cvl calculation. Maybe you can pack it in a zip file and get under the 10k limit? I\'m not sure a factor at 1 is the right one, b...

CVL is recalculated multiply times, with different formulas in different stage off the charge. If you program the REC parameters, different charge voltage will effect a number off things as desc...

Yes I can but then I have a to high \"float voltage\", so it does not solve the problem. Problem still persist. The factor is still a big problem.

Just change CHIS til some lower value, problem solved?  

Hi   CVL is calculated 4*(CHAR-(CHIS*0.2)) according to the  ABMS manual, but after some calculating the 0.2 factor is more like 0.5. The factor is a problem because it\'s to low. If you...

I\'m currently using a MSI workstation (PC) with Windows 10 64bit. An important note is this laptop only has USB3.0 ports and one USB-C.   What I downloaded from Wakespeed website: ...

So far as I know CVL = (4*CHAR)+.0.1V   When balancing start, CVL is recalculated! And when batteries are full CVL is recalculated again. Above I use the CHAR for \"\"End off charg...

Looking at \'BMS Charge and Discharge Limits\' in VRM I am reading CVL - Charge Voltage Limit (V) as 13.3V. With BMS set as 3.55V end of charge voltage and 0.45V hysteresis CVL is 13.3V. Chan...

Thanks Rick!

That\'s what I get too. My math was to take the 5500A/50mA IOJA  of 0.0195313 x 50 / 75 = 0.01302086666

Those were just generic snips I grabbed one day to show what data is displayed.  It is a demo system that we experiment with, so it could have been in any state at the time. The idea was to show...

It will just not have the new parameters they added and you need to do firmware updates using the DOS tool that Wakespeed includes with the zip file.

Quote from Rick-admin on January 9, 2022, 9:33 am Hi Salvey, The REC BMS functionally acts as a Master DC source on the CANBus network via the Cerbo, and becomes part of the Victron Ecosystem. ...

will it work, at least partially, on 2.4.3 and on 2.5.0-beta? or it is not functional with the latest firmware?

Thats only for if it loses CAN communication/BMS is not working (super conservative - might change it).  Otherwise, it\'s charging is directed by the REC BMS.

Hi guys   Just wondering if I can confirm my value as the formula is a beast! For a 500A/75mA shunt, it would be 1.30208e-2 - is that correct?

Hi Ben. Yes I do agree, balance in the cells is important, and will play an large role in how long the process will be in charging the cells. But my 1000AH Winston bank is perfectly balanced....

Hello Natecostello, Very nice how you made the logging data graphics!! But I am surprised that your bulk setting is only 13.2V

I have seen fluctuation amps with MPPT controllers as well. I see also customers installations with NO fluctuation with MPPT controllers. The fluctuation in amps I could solve the problem with re...

This is great! Thanks for sharing.

I finally got around to documenting my config and testing which may be of use to other.  For background my system is a 560HA 24V LFP built from EVE 280 cells with a REC-Q BMS.  The Wakespeed is con...

From Tine at REC BMS Head office: 1.0 was only beta, not upgradable by(to) 1.2 and 2.0. 1.2 and 2.0 can be upgraded. (2.0)HW has a bit different layout and external LEDs. () are my notes

From Tine at REC BMS head office: It is programmed as a charge control, but we can custom re-program it for a small fee of 25€.

Packs that comes out off balance is mainly cheaper cells. I dont see this with Winston cells for example. I think balancing below 3.5V has negative side effects.  

This is an interesting topic and there are some good points here. After more than 10 years experience with various LFP cells, like Ben I have found that trying to maintain an LFP pack at a parti...

There are different ways to do. A easy way is in a GX product, under DVCC, set MAX voltage to 13.1V or 13.2V. Negative side effect: If you do this for a long time,  batteries can become sl...

Rich and Rick, How best to \"store\" our house bank of LiFePo4 managed by a REC Active BMS has been an ongoing concern for us since installing the system 2 years ago. Our system includes a Victr...

Nice, thank you. I will contact them when closer to doing my install.