Paul, you raise a good point.  We have recently been doing some REC / Victron /WS500 integration testing and found that when we had the REC BMS monitoring our battery current the system seemed much...

If the shunt is on the battery, that is good for tracking charge state as current tapers with constant voltage, and perhaps terminating charge based on profile. Also good for keeping battery curre...

The REC users manual includes some detail on how the whole ADC converter is able to extrapolate and read current flow from your battery system.  There is a calculation there explaining the math req...

Thanks from user Ben, who reminded me that with the WS500, unlike older external regulators, you would disable it or remove its power instead of using the field wire.

Hi Robin, Early on in the BMS era we needed to have separate UV and OV circuits to protect our systems.  With the advent of \"Smart devices\" using CANBus it becomes less of an issue. As you ...

Hi- Thanks for putting this forum up. I\'m interested in the REC BMS for a future boat install using a Victron and Wakespeed based system. Understand that the primary charge/discharge control wi...

Bob, I was able to replicate your error but only by using small letters then pressing \"Enter\". The error remained until I gave it a new value using CANF 1 (Send) Then I tried CANF ? (Que...

CTRL=O,   Caps are on It appears you have a space between CANF  and ?  Tried it both ways then hit Query with same ERROR 1 response . Showing live data from the battery. For trouble shooting ...

make sure your CTRL address is set to zero (0) in File-> Options make sure you use CAPS click the \"Query\" button to check values  like CANF ?   (Query) click the \"Send\" button to se...

I set it to one and got a new message in reply box.  ERROR 1.   Getting closer

Great! Thanks!

You can leave your battery capacity setting on WS500 as is.  This value doesn\'t really apply to your configuration.

I am currently set up charging 2 Lifeline 8D AGMs with a Balmar XT-170 alternator and a WS500 (house).   I plan to use a Blue Sea 7622 ML-ACR to combine this bank to an identical Lifeline bank (sta...

it sounds like you have the wrong \"send to\" address in your BMS command window.  It typically defaults to 100 and likely should be 1 for a Q BMS or 2 for an Active BMS.   Remember that...

Hi Peter, A bit of flagrant self promotion here but we originally started this company providing software for the WS500.  We have found it to be very helpful in configuring and fine tuning our t...

When I enter CANF?  I get the following error: Error 65 occurred at Serial Read LabView: Serial port timeout:  bytes not received at serial port =================== Labview: The network...

Hi Rick, I think this thread is appropriate for my question.  I’m connecting the WS500 to a Cerbo GX with REC-BMS Q and Multiplus 24/3000/70-50.  The WS500 is regulating a Nations 24v/150A alternat...

I havent actually tested the MPPT VE.CAN direct but the answer should be yes.  (My test MPPT is a smaller USB version so not possible to verify) And you do not need the MK3 USB to VE.Bus cable t...

Thanks for the quick reply! I do have a Cerbo GX and just realized that the MultiPlus has VE.bus ports, not VE.Can, so it has to be connected to the Cerbo GX. For fault tolerance, I am hoping...

Your best bet is to add a Victron Venus/Cerbo.  The REC will become your Victron DC Power Source and it makes for a pretty slick solution. https://www.victronenergy.com/panel-systems-remote-moni...

Ask for Rick at Wakespeed and he will get you the info to convert. http://www.wakespeed.com/contact.html

Any hints on having a REC Q, VE.Can MPPT, and MultiPlus inverter/charger all on the same VE.CAN bus?

It looks like I\'ll have to replace one of my Mastervolt alternators, and Balmar may be the only one that\'s available in a reasonable time. That means I\'ll likely have to modify the WS500 harn...

In the manuals I could find for the Sunny, there was no details provided. Based on my experience working with other products, if it were me I would connect the REC BMS CANbus cable to the SMA In...

Thanks Rick.  I will try that tomorrow at site.  How do I connect it with the Midnite solar connected as shown or do I use one of the SMA In/Out ports on the right?  

My first thought would be to verify they are both using the same CANBus speed.  Type in CANF? in the BMS communications window of the PC software and press query to get the REC speed, and compare t...

I\'m trying to get the REC BMS to talk to the SI and I get a  communication error on the SMA like it does not recognize the communication.  I assume I don\'t have it connected correctly.  I am seei...

You nailed it !  You also need to size your current shunt for the application.  Ideally you want to run in the 1/10 to 2/3 of its capacity range.  This will provide the most accurate readings and h...

Thank you very much Rick! To be sure I precisely understand you, the battery bank to consumption devices such as inverters, etc. is not limited in amperage by the REC BMS. The limitation is only...

Hey Ed, The REC uses an external contactor so it all comes down to what contactor you want to use.  We recommend and stock the Tyco EV200 series.  These are an awesome sealed 500 amp contactor, ...

Thank you for the cool BMS design. While looking at the documentation of the Q series, I noticed the Q series has a sink amperage of 200A, while the Victron model shows 100 Amps. I plan to use the ...

That\'s a great idea! Thanks for sharing

I haven\'t done this myself, but I would guess the short answer is yes, but... If the impedance of the two windings are different, you will have different loading and it may cause some undesirab...

Hi, I have a similar setup, including a Victron Cerbo GX. The REC BMS is connected to the Cerbo over VE.CAN, and the Multiplus is connected over VE.BUS to the Cerbo. This allows me to use the DV...

From my understanding you like to install a second alternator on the same engine. Thing to connect to the second alternator: -extra additional alternator temp sensor to the battery temp senso...

in my hunger for more amps i am throwing round the idea of adding a 2nd alternator to engine. i already have a balmar 621 100A connected to the WS500.   my question is i know the WS500 c...

Problem solved. Moved the positive sense from the alternator side of the switch to the battery post. Am able to  oper ate the engine at 3000 rpm and achieve 14.06 volts and 82 amps. Brought the SOC...

What has worked well for us was to just turn off the BMS when the pack was in the 60-70% range.  We have left it for more than a year and the pack was within 1% of where we left it.  You might want...

Looking for advice on how best to configure the REC BMS for extended periods where the battery bank is not in use.  I have a 800ah 12v house battery bank on our boat monitored via REC BMS controlli...

Hello Don, If the cell voltage are in balance at 13.1V, maybe they are out off balance at charging voltage from 14.1V I am not sure about kilovault but in general the SOC is reset to 100% if ...