Battery Box - Built-in Voltage Sensitive Isolator

🔋 Thumper Battery Box with Built-In VSR (Isolator System)

Automatic Charging. Portable Power. No Complex Wiring.

The Thumper VSR Battery Box is the ultimate plug-and-play dual battery solution, combining a portable power system with an integrated voltage sensitive isolator (VSR).

Charge your auxiliary battery automatically while driving, then safely isolate it when the engine is off — protecting your starter battery every time.

🚐 Smart Dual Battery System – Made Simple

No complicated installs. No guesswork.
This system gives you automatic charging + full portability in one complete unit.

⚡ Key Features

🔄 Built-In Voltage Sensitive Relay (VSR)
Automatically connects and disconnects based on vehicle voltage.

🚗 Protects Your Starter Battery
Cuts off at 12.7V to prevent draining your cranking battery.

⚡ Charges While Driving
Reconnects at 13.2V — charges your auxiliary battery from the alternator.

🔌 Dedicated Alternator Input (50A Anderson)
Clearly labelled input for vehicle charging — safe and simple connection.

🔋 Portable Power System
Charge in the vehicle, then remove and use anywhere.

🔌 Power Outputs

🔋 2 × 50A Anderson Connectors (Bi-Directional)
Use for charging, solar input, or powering accessories.

🔌 2 × 12V Cigarette Sockets (16A Rated)
Run fridges, lighting, and accessories.

❄️ Engel Fridge Socket (16A)
Secure connection for portable fridge setups.

📱 Dual USB Output (2.4A / 5V)
Charge phones and devices (active when voltmeter is on)

📊 Smart Monitoring

📊 Digital Volt Meter
Monitor battery voltage in real-time (via push button control).

🔘 On/Off Control Switch
Turn display on only when needed to conserve power.

🛡 Built-In Protection

⚡ Internal circuit breaker protection on all outlets
🔒 Fully pre-wired for fast installation
🔧 Includes complete vehicle wiring loom

⚙️ VSR Specifications

• Connect Voltage: 13.2V
• Disconnect Voltage: 12.7V
• Max Charge Capacity: 50A

✔ Ideal for vehicles without smart alternator

💪 Built for Australian Conditions

🛡 Heavy-duty construction for off-road use
🚙 Vibration resistant for touring & corrugations
🇦🇺 Designed and built in Australia by Thumper

🚐 Perfect For

✔ 4WD dual battery systems
✔ Caravan & camper trailers
✔ Touring & off-grid setups
✔ Portable power solutions
✔ Fridge + accessory setups

🚀 Why Choose the Thumper VSR Battery Box?

✔ Automatic dual battery charging system
✔ No need for separate isolator install
✔ Fully portable power solution
✔ Easy DIY installation
✔ All-in-one professional setup

🛒 Smart Power Without the Complexity

Get the benefits of a dual battery system without complicated installs. The Thumper VSR Battery Box gives you automatic charging, full protection, and portable power in one unit.