You need to remember that the SOC is a calculated value based on several variables and if you have a zero calibration error it can get out of tune very quickly with as little as a 0.5% error.  Furt...

Hello I am still learning about the 4S REC BMS. My question this time is related to the SOC. I question the accuracy of the process used to determine the SOC. For instance, I charge my small 20 ...

During our last system upgrade our software licensing integration failed so we are now when you order the WS500 Config app, we will be sending you a registration file that will install the key for ...

Quote from Blaine Kubesh on February 23, 2021, 7:38 pm Regarding the 7amp  max draw when switching.  That current craw comes from the 15Amp fused power supply (red wire), *NOT* the NO (brown) or N...

Regarding the 7amp  max draw when switching.  That current craw comes from the 15Amp fused power supply (red wire), *NOT* the NO (brown) or NC (orange) switch circuit.  So I don\'t think the BMS in...

Thanks Blaine, very helpful information.

An even better solution is to use Blue Sea Systems 7713 or 7718 which operates like a Normally-Open RELAY,  instead of the 7700 which needs a special circuitry to connect.   It appears the 7713/771...

I found a solution for adding pins.  Since I am not using all the OPTO wires in the harness,  remove two of those and move them to the RELAY NC pins on the AMPSEAL connector.   Detailed Instruction...

I am running into this same issue.  Was planning to connect the Relay NC wire to drive the  bistable relay per the cruiserforum schematic . I am surprised the Relays NC wire was not populated in th...

TE Connectivity crimps 770854-1 may be used.  See ABMS manual for adding extra connections. There is a 3.15 A Slow blow fuse with a 2x3A @ 12 VDC internal relay. We do not recommend to drive 7A bi-...

Thank you for the diagram, but I am looking to control the Blue Sea’s unit from the REC BMS. Can you help with that configuration?

Thanks to Ben for finding this link and wiring diagram from Cruisers Forum. See attached wiring diagram In this configuration the power for switching is drawn from the red wire, not the orang...

Tine, can you help with inquiry please. @tine  

After reviewing the electrical schematic for this unit, we find that it is actually more like two alternators in one and provides both 24 and 12v outputs at the same time.  I contacted the WS500 de...

Hello, I am interested in using the signal relay1 - user defined  normally closed (pin 1) of the main connector. What are the specs and pin type I would need? My request is from the need to draw...

Why would full scale for a 4S configured BMS be set at 34 volts?  Isn’t 4S by definition a BMS for 4 cells with a max voltage somewhere around 18 volts no matter the chemistry of the cells? This wo...

Hello,   I do not believe the scale dynamically adjusts  - and is fixed for both 12v and 24v deployment.  The Color bands seem to be the same situation.

Hey Dan, This brushless alt will work fine with the WS500.  If I recall correctly this field is going to draw around 9-12 amps full field, and the WS500 is actually designed for field loads up t...

Good Morning, We are working on a yacht that has a C.E. Niehoff N1246. It is a brushless alternator that is dual voltage 28/14 vdc  220/50 amps. The owner wants to switch over to lithium and ...

REC has just introduced a new WiFi module that will connect to your new or existing REC Actve BMS, and the Q/SI Series. This nifty little unit will allow your to monitor and even re-configure yo...

This new harness provides the plugin connectors for both the temperature and current shunt sensors on the REC Q and SI series BMS\'s Pictures coming shortly https://www.offgridsoftwaresolutio...

Thank you Tine. That was helpful. I opened the program as an admin and that must have changed  the windows restrictions permanently. I am just learning about the BMS and have multiple questions....

The problem lies within Windows restrictions. If the folder where the PC user interface is installed does not allow the application to change settings it will not do it. You have to enable the .ini...

Hey Rick, This was a great question so I have moved it to the User forum. To answer your first question, yes you can place the two shunts in series without any issues. And secondly in most...

I am upgrading my house bank charging system and have purchased a Balmar XT170 alternator.  I will be using the WS500 for the exciter and plan to install the optional shunt and battery temperature ...

Hi Tine, Can you help us with this customer question? Rick @tine  

I am not sure if this configurable or not.  Al, any ideas on this one? Rick OGSS @al-thomason

I don\'t have a system set up yet.  Al, are you seeing these errors? Rick @al-thomason

when I exit the program and return, I continue to get a few items I would not expect, they are the fact that I get the error pop up window error 1073807343 and I also have to reset the com port fro...

Hello, I have a 4S unit. I am using the REC software. On the screen, I see the Vbat meter showing 34 volts at full scale deflection. I would expect the full scale to be around 18 volts. Are the ful...

Thanks Rick, this is one of my questions that I did figure out as I found it in the online manual. My next question is how do I post a new question. I can’t seem to find that on the website.

Yes, its as simple as that.  The WS500 has a parameter that allows you to reverse it with software but I believe the REC requires you just reverse the wires

I am charging my LFP pack and the software is showing a negative value for my charge current. I have the two wires going to the shunt connected so the one that is identified as negative on the batt...

  Feedback from Korolev Alexey, support engineer, Yacht Devices Ltd   I am interested in controlling a power switch (like the Switch Control YDSC-04) YDSC-04 is a button pane...

I am interested in controlling a power switch (like the Switch Control YDSC-04) from an NMEA 2000 Tool running on a PC. I see from the documentation that PGNs 127501 and 127502 are supported, but c...

It looks like Victron is now working on the WS500 integration! This means the Victron Venus product line will now recognize the WS500 and integrate it into its network. To stay on top of its ...

Hi, I moved this to our forum as it may be of interest to others. The SI is basically a Q Series with custom CANBus integration code for a specific vendors charger and/or inverter such as Victro...

Hello! Do you have experience with the REC-BMS SI in a Victron-based setup? I believe it should work well with the Cerbo GX over Canbus, and that I could use the REC-BMS LCD in addition to the C...

Also, the registration key is included with your final Completed order and can be found near the bottom of the page.

Blaine, Hello.  Rick asked me to chime in:  You are correct.  What happens is the REC BMS will send charge needs and directions out via CAN which both the WS500 and Victron\'s CCGX receive.   Th...