Victron BatteryProtect 48V-100A — BPR048100400

The Victron BatteryProtect 48V-100A is an automatic battery disconnect device designed to protect 48V battery banks from over-discharge. It disconnects the load before the battery reaches a critically low voltage, preventing cell damage and extending battery service life. It is suited to off-grid solar systems, marine installations, and any 48V DC application where load shedding is required.

Key Features

• Rated at 100A continuous current on a 48V system, suitable for substantial DC load circuits.
• Automatic disconnect on low battery voltage with configurable reconnect threshold, protecting cells from deep discharge damage.
• Extremely low self-consumption, minimising parasitic drain on the battery bank when idle.
• Remote on/off input allows integration with battery management systems, inverters or manual switches.
• Alarm output provides a pre-disconnect warning signal, allowing loads or systems to shut down in a controlled manner before isolation occurs.
• Compatible with lithium (LiFePO4) and lead-acid battery chemistries, with voltage thresholds selectable via a rotary switch.
• Compact, lightweight design at 0.8 kg, suitable for panel or DIN rail mounting in enclosures.

Product Overview

The BatteryProtect works by monitoring battery voltage continuously. When voltage drops to the programmed disconnect threshold, the unit opens the load circuit and holds it open until the battery recovers to the reconnect voltage. This prevents the sustained low-voltage conditions that cause irreversible capacity loss in both lead-acid and lithium cells. The rotary switch on the unit allows the installer to select from several pre-set voltage profiles without any additional programming tools.

The remote input accepts a signal from an external source such as a Victron BMV battery monitor, a BMS, or a simple switch. This allows the BatteryProtect to be overridden or controlled as part of a wider system. The alarm output can drive an LED indicator or feed a signal to a monitoring system, giving advance notice before the full disconnect occurs. These features make it straightforward to integrate into both simple and more complex off-grid or marine DC systems.

At 100A, this unit covers a wide range of 48V load scenarios including inverter pre-loads, DC distribution boards, and auxiliary circuits. It is not a charge controller and should be wired on the load side of the battery, not between the battery and charger.

Technical Specifications

Applications

• Off-grid solar systems with 48V battery banks requiring automatic load disconnect on low voltage.
• Marine and narrowboat DC systems where battery protection is required on auxiliary load circuits.
• Motorhome and vehicle conversions running 48V DC distribution.
• Telecom and remote monitoring installations with 48V battery backup.
• Any 48V DC system where preventing battery over-discharge is a design requirement.

What Is Included

• 1 x Victron BatteryProtect 48V-100A (BPR048100400)

Installation Notes

The BatteryProtect must be installed on the load side of the battery, between the battery bank and the DC loads. It must not be placed in the charge circuit. Wiring should be sized appropriately for 100A continuous current and protected with a suitably rated fuse. Installation in 48V systems should be carried out by a qualified electrician or experienced system integrator familiar with DC battery systems. For systems connected to solar PV or grid-tied equipment, ensure all relevant wiring regulations and local compliance requirements are observed.