REC Active 12-Volt BMS (Battery Management System) Kit REC
REC Active 12-Volt BMS (Battery Management System) Kit REC

REC Active 12-Volt BMS (Battery Management System) Kit

This product is available.
Regular price$699.00
Shipping calculated at checkout.

CANBus Cable
  • In stock, ready to ship
  • Inventory on the way

Higher Wire is proud to be offering REC BMS units for our customers! The Active 4S BMS is perfect for 12-volt applications. We use REC BMS for larger builds, especially those that want to take advantage of CAN communication with Victron, SMA and other inverters or charge controllers.

We're offering an all-in-one kit to easily build your own energy storage system using the REC Active BMS. It includes the BMS, premade wiring harness, shunt and 200a contactor. It also includes the wifi module, which is required to program the BMS, as well as an optional CANBus cable for Victron or others.

These components will support 5,000 watts at 12 volts. Need more? Contact us for a custom kit or check out our REC 2Q kits for higher-voltage systems.

REC Active BMS user's manual

Wifi module

You can find more info on the wifi module here. And click here for the wifi module user's manual


  • Li-PO, LiFePO4, LiFeYPO4, LiCoO2, LiMnNiCo and LiMnO4 Lithium-Ion chemistry
  • 4 series connected cells per unit
  • high efficiency 2A bi-directional active balancing (pack to cell and cell to pack)
  • IP65 protection enclosure, AMP 35 pin water resistant connector
  • 2 – 5 V measuring range, 2 mV accuracy
  • up to 2 digital temperature sensors
  • shunt current measurement
  • robust and small design
  • galvanically isolated RS-485 and CAN communication protocol
  • two programmable fused relay output
  • two programmable fused digital output
  • ON/OFF switch
  • LED and buzzer status indication
  • bootloader
  • error LED + buzzer indicator
  • PC user interface for changing settings, data-logging and firmware update
  • compatible with REC LCD touch display for monitoring
  • also compatible with Victron inverters for solar applications


This kit consists of the following:

  • REC Active BMS
  • REC Active BMS Wiring Harness
  • 500a/50mv shunt
  • Tyco IHV200HDANA 200a contactor (or equivalent)
  • REC BMS Wifi Module
  • OPTIONAL CANBus cable to Victron or SMA

We ship the majority of our orders by the next business day. Lithium batteries may take up to two business days to process to accommodate inspection and logging into our system.

Our shipping rates are based on the weight of all ordered products plus estimated weight of packaging. We make every effort to forecast an accurate shipping cost, but cannot be 100% certain in all cases. Please contact us at with any questions prior to purchase.

We pack and label all lithium battery shipments in accordance with Federal Regulation 49CFR173.185, as well as USPS Publication 52 Hazard Class 9 or UPS/Fedex guidelines. Unless otherwise stated, lithium batteries are not eligible for free shipping.

We try to pack all items in an order in a single box, however we may on occasion need to ship items separately. Special shipping does not apply to lithium ion batteries, and orders that include batteries may not qualify for free or expedited shipping.

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