The ThunderBox TB-U01 or TB-U02 simplifies and secures the connection of electronic accessories (additional lights, heated grips, GPS, phone charger, additional gauges, and other powered devices) to your BMW

1300, 1250, 1200, 1000, 900 / GS, XR, RS, RT, R, RR, XR.... It acts as an automatic, easy-to-use power distributor between the battery and the accessories. Thanks to the supplied quick-connect terminal blocks, installation is simple and fast, with no tools or special knowledge required.

The ThunderBox not only extends battery life, but also protects the bike's electrical system against overloads and short circuits. Solve your power supply problems in the blink of an eye!

Simple and quick to use,
the control unit connects directly to the battery terminals. Then choose between fully automatic or manual operation (with ignition key). Connect auxiliary equipment quickly, easily, and safely using the supplied tool-free terminal blocks. Simply connect the cables, and you're ready to go!

 Multiple operating modes:
The ThunderBox can operate in three different modes. Depending on how the WHITE control wire is connected, the following modes are available: Automatic mode:  When the engine starts and runs steadily, the ThunderBox activates the power outputs.
When the engine stops, the outputs are deactivated after a few seconds.
Ignition-controlled mode: The ThunderBox activates/deactivates the outputs (with a delay of a few seconds) according to the position of the ignition key.
Standby mode:  The ThunderBox does not power the outputs, even when a battery charger is connected. This mode is useful during winter storage, as a trickle charger will not activate it.

 Exceptional technology:
the TB continuously monitors the battery voltage, engine status (running/stopped), and outputs, then automatically activates/deactivates the loads. The TB isolates/cuts off power to the accessories until the engine starts and runs properly, thereby ensuring 100% battery power for starting. This fully automated process ensures trouble-free starts and extends battery life.

 Small but robust.
We use only the best components and technologies to create products capable of withstanding the most extreme environments. The TB has no moving parts, relays, or fuses. Inside its durable plastic housing, the circuits are encapsulated in epoxy resin, making it completely resistant to oil and water, as well as shock and vibration.

 Wide compatibility
Compatible with ALL vehicles using a 12V battery system (all battery types and capacities are supported), including all motorcycles, cars, ATVs/UTVs, kit cars, and even lawnmower tractors.

 USB charger:
With optional USB chargers, power to your mobile devices is activated and deactivated automatically and protected. You can connect multiple USB chargers to a single TB unit.

TB-USB1: 1x 16A
USB charger with a weather-resistant USB-A socket. Input: 11-24 V, Output: 5 V DC, 2 A

TB-USB2: 2x 16A
USB charger with a USB-C socket (for increased socket protection, you can use a short USB-C extension cable).
Input: 11-24 V, Output: 5/9/12 V DC, 3 A