🔋 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.
