Active Regenerative Energy Dump Module

LSEV Lithium Battery Downhill RegenGuard Safety kit   RT-RG2000

Downhill Regenerative Braking Safety
Over voltage Protection

Background: Regenerative Braking and Lithium Battery Cut-off Risk in Golf Carts

Regenerative braking is widely adopted in modern electric golf carts to recapture kinetic energy during deceleration and downhill driving, converting it into electrical energy that is fed back into the battery pack. This technology is employed across vehicles ranging from the EZGO RXV to models by Club Car, Yamaha, and various other manufacturers.

The EZGO RXV represents a unique case: it has no traditional mechanical friction brakes (drum or disc) for routine dynamic slowing. Instead, it relies entirely on the AC motor's regenerative braking to control speed. For parking and emergency holding, it is equipped with an Electromagnetic Brake (EMB) mounted on the motor. When the lithium battery is at or near 100% State of Charge (SOC) and the Battery Management System (BMS) cuts off charging to prevent overcharge damage, the regenerative braking path is abruptly lost. In this scenario, the RXV's control logic may trigger the EMB to engage the motor shaft as an emergency response. This causes the vehicle to stop suddenly and violently, creating a significant safety hazard as occupants can be thrown forward due to the abrupt deceleration.

Other carts, such as those from Club Car and Yamaha, retain conventional mechanical brake systems as a backup. However, they face a related risk: when the BMS halts charging during downhill regen, the energy dissipation path is blocked, causing the regenerative braking assist to disappear instantly. While the mechanical brakes can still slow the vehicle, the driver experiences a sudden loss of deceleration assist, resulting in inconsistent pedal feel, extended stopping distances, and increased mechanical wear. Repeated charge/discharge toggling by the BMS also places additional electrical stress on the system.

In both scenarios—whether the sudden engagement of an emergency electromagnetic brake or the sudden loss of regenerative assist—a active regenerative energy protection module is critical. It dynamic monitor battery status and actively provides a dedicated load to dissipate excess energy when the battery near to full charge, ensuring smooth, predictable braking performance and safe downhill control.

Features:
Cell over-voltage protection(with RETANK CAN Bus meter)
Total over-voltage protection
Voltage rapid rise protection
Button click for manually/emergent dumping protection
Up to 2kW active regenerative energy dissipation
Vehicle vibration detection and alert
Over-temperature protection
Cooling fan delayed shutdown
Cooling air exhaust pipe vertical or horizontal install
LCD panel for specification configuration

Applications:
Golf cart and LSEV battery protection
Downhill Regenerative Braking Safety
Motor Regenerative Power Dumping
Active Overvoltage Protection
Dynamic Regenerative Dump Resistor
Battery Pre-Discharge for Regen Protection

  Dimensions and installation: