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REC Active BMS WiFi Kit

REC Active BMS WiFi Kit

Regular price $579.00 USD
Regular price $673.80 USD Sale price $579.00 USD
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The REC Active BMS Kit includes cables and WiFi module and is designed for 12V systems, providing advanced battery management with 2A active cell balancing. It's compatible with Victron, WS500, and supports a variety of Lithium-Ion chemistries. Key features include IP65 enclosure, precision measuring, temperature sensors, shunt current measurement, and extensive communication options including RS-485 and CAN.

Low stock: 1 left

REC BMS Product Line Overview

Store Reviews

Great customer service

Rated 5 out of 5 April 5, 2022

Rick was wonderful setting me up with parts for a project for a film studio. He was able to provide quick advice for a part that wasn’t functioning as expected and recommended a replacement part quickly. I’m happy they are carrying the REC BMS and have them in stock! It’s a very solid system that’s easy to interface with!

Avatar for Jeff Jeff

Response from Off Grid & Marine Energy Systems

Thanks for your kind words! I am glad we were able to help get you fixed up and running.

Easy to use website

Rated 5 out of 5 March 25, 2022

Fair prices for what I needed and easy to make sure I got all the accessories I needed due to the format of the product page.

Avatar for Brian Brian

Response from Off Grid & Marine Energy Systems

Thanks Brian, we are working now to make it easier to find the right product for your application.

Great customer service!

Rated 5 out of 5 January 10, 2022

OGSS was there to answer all of my pre-order questions and their communication response time is top notch. Great people to work with and I’ll be ordering from them again in the future.

Avatar for Matt Digan Matt Digan

Response from Off Grid & Marine Energy Systems

Thanks Matt!

REC-Wifi unit inoperable

Rated 3 out of 5 November 3, 2021

I purchased the rec-wifi on the advice of and the REC website. I could not log into the wifi unit referencing the product manual. I found many individuals were having the same problem through a web search. In the end, I purchased the pc software which allowed for me to change the parameters associated with my specific system. My understanding is that one cannot do what with the wifi system. The touch pad also just displays information, it does not allow one to alter the bms parameters.

Avatar for Tom McDonagh Tom McDonagh

Response from Off Grid & Marine Energy Systems

Hi Tom, sorry you had issues with the WiFi module. Early versions did have some issues but not recently and your situation seemed unusual. Hopefully Tine at REC was able to get your WiFi working for you in the end. The WiFi module, when working, will actually provide all needed functionality but you are correct, the LCD screen is for viewing only.

Excellent Service and quick delivery!

Rated 5 out of 5 September 27, 2021

Had to clarify a few things before we placed the order, Rick was very responsive and helpful. Will definitely buy again in the future.

Avatar for Kilroy Bus Kilroy Bus

Response from Off Grid & Marine Energy Systems

Thanks and glad we could help. After a few hiccups our new warehouse and shipping team is really coming together!

Definitely buy all of your gear from Rick

Rated 5 out of 5 September 17, 2021

Five stars all the way. Rick was very helpful throughout the process, and I’m already telling people to get their gear from him and OGSS. You can’t go wrong!

Avatar for Van Gogh (van build name) Van Gogh (van build name)

Response from Off Grid & Marine Energy Systems

Thanks for the kind words! Glad we got you sorted and thanks for your testing and feedback!

Efficient and prompt

Rated 5 out of 5 May 5, 2021

Recently purchased wakespeed alternator and was impressed with the prompt service and order fulfillment. The unit was well packaged and using USPS for delivery here in Western Canada saved me the typical huge customs brokerage fees that ups and fedex charge.

Avatar for Phil clatk Phil clatk

Great Support

Rated 5 out of 5 April 3, 2021

Purchased REC 16s BMS from Off Grid Marine Energy systems and did not purchase the current sensor wiring harness, I emailed asking if it was meant to be included and they threw it in for free. When I had questions about shipment they were answered in a timely and polite manner.

Avatar for Zak Crawford Zak Crawford

Great service and support!

Rated 5 out of 5 March 29, 2021

Trying to get an SMA SI to talk with a BMS has been a Challenge. Rick was a great help in getting me there.

Avatar for Bob Bob

extremely fast delivery

Rated 5 out of 5 March 17, 2021

Outstanding fast service – in answering questions as well as in shipping to Europe – very impressive indeed!

Avatar for Robin Robin

Awesome service and support !

Rated 5 out of 5 March 1, 2021

Rick gave us just the best possible service while setting up our LiFePO4 system with the WS500.
Thank you

Avatar for Fred Fred


Rated 5 out of 5 February 8, 2021

Recommended seller. Great pre AND POST sales service. Thank you Rick and everybody on your team. Cheers Chris

Avatar for Christian Christian

Great Service

Rated 5 out of 5 October 10, 2020

I am on a cruising boat currently in Aruba, and hoped to upgrade our charging system here due to favourable customs duties on imports. My purchase went awry when informed me they couldn’t deliver the alternator I ordered. I couldn’t find a replacement at this time so I had to cancel my order for a WS500 from Off Grid (I had placed the order right after ordering the alternator). Rick was very helpful in trying to find another source for the alternator, and providing information on what I would need to install it. When the only option turned out to be a size up in amperage (that I couldn’t use) and $$$ I balked. Rick refunded my money without hesitation. I will eventually get a WS500 from Off Grid, when Balmar restocks and when I know where I will be in a months time.

Avatar for Robin S/V Toboggan Robin S/V Toboggan

Response from Off Grid & Marine Energy Systems

Thanks for your kind words Robin, I am just sorry we couldn’t pull it together for you. We will keep a watch out for availability and hopefully we will get you fixed up in a few months.

A big shout out

Rated 5 out of 5 March 30, 2020

A big shout out for Rick Bell of
His knowledge and patience helping a novice install and commission a Wake Speed WS500 after a lightening strike wiped out the old charging system (alternators, Balmars, wiring the lot) has been refreshing in this day and age.
I am very grateful to him (especially during this Covid-19 shutdown)and the other technicians from offgridsoftwaresolutions for helping me problem solve a charging issue caused by a declined magnetic core.
A simple fix if you know what you are doing but I clearly don’t so very frustrating for him but thank you from me.

Avatar for Richard s/v Por Dos Richard s/v Por Dos

Response from Off Grid & Marine Energy Systems

Richard, we are just glad you got everything working. It can be hard to remotely troubleshoot, but your detailed testing and pictures really helped the process!

Love my new WS500's

Rated 5 out of 5 January 22, 2020

I’ve used the WS500 Configuration tool to setup my dual WS-500 regulators and to tune and monitor things the first few months. I love being able to see the alternator temperature along with the output all on a graph. This software also helps a ton in configuring the WS-500 which has a wealth of options, but can be overwhelming to configure at the command line. The WS500 Configuration software makes that much easier. You can read all about it in my full review at

Avatar for Steve Steve

Response from Off Grid & Marine Energy Systems

Steve, thanks for your support and the detailed review in SeaBits. This should help others make an informed decision!

View full details

Near complete REC Active 12V BMS kit with Wifi Module.  Just add a safety relay/contactor and field wiring.

Kit includes the custom wiring harness with cell & relay wires, CAN and RS485 cables, temp. sensor, and remote ON/OFF switch as well as the Wi-Fi Module for configuration, monitoring and logging, all from a standard browser such as Safari, Chrome, Edge, etc.

Designed to provide unsurpassed battery
management in 12 volt systems, the REC Active BMS delivers 2A
cell equalizing with active balancing and synchronous flyback bidirectional energy transfer from cell to pack and pack to cell.

Suitable for (1-4)P4S packs of up to 1,000 Ah, and even larger for well behaved quality matched cells.  (Unmatched or B grade cells may limit pack size, due to continuous balancing needs)

2A cell equalizing with active balancing with synchronous flyback bi-directional energy transfer: cell to pack and pack to cell two fused relay outputs with NO and NC pins two fused galvanically isolated/non-isolated digital outputs with PWM option

It is also a member of the "Smart" line of DC power products that integrate with the Victron Cerbo/Venus as well as the Wakespeed WS500 on the CANBus network. 

Kit includes:

  1. REC Active 12V Smart BMS
  2. REC Active Prewired harness with Amp connector, temperature sensor and remote On/Off switch
  3. REC Wifi module
  4. Victron interface cable
  5. 500A/50mv current shunt
For systems with large inductive loads such as inverters you may want to include a REC PreCharge module to reduce arcing and EMI during startup.