The Crooked Box Off-Grid Auxiliary Battery System

The Crooked Box is a fully contained, fully serviceable auxiliary battery system for your van or truck camper. The Box uses all the best features of a professionally built power system and puts them into an easy-to-install form factor. Get off-grid fast. A perfect solution for camper builders or DIY-ers for high electrical performance and ease of install.

Built-in MPPT solar controller, DC-DC charging, fused outputs and inputs for 12 circuits. Easy plug-ins for inverter and shore power charging if desired. Ready for your build.

Features:

• Small form factor for builds where every square inch counts.
• Fully serviceable
• Full auxiliary power system – not just a mobile charging station
• Tough aluminum case
• Aircraft grade hardware
• Hand built in Washington state

Inside the box:

• Expion 360 LiFePO4 battery
• Redarc BCDC charger
• Smart shunt with Bluetooth communication
• Fused in/out for DC loads
• Fused output for inverter

Specifications:

• Dimensions: 14”L x 10.75”W x 11”H
• Battery: 100, 120, 132AH (expandible)
• Weight: 45 lbs
• Charge rate (DC/Solar): 25A or 40A
• Max discharge: 1200W

Crooked Finger Designs has a long history of designing and installing off-grid electrical systems for rigs. We do large systems, and small systems, but our specialty has always been systems for the rigs that go the distance: westfalia’s loaded for full time living, beefy land cruisers and compact overland rigs, vehicles where performance is paramount, and every square inch of space counts.

After years of designing and installing custom systems for dozens of customers and rigs, we took on the challenge of distilling these systems down into the best possible system, in the smallest footprint we could manage.

The Box is more than just a mobile charging station for your phone and fridge, this is a fully functional 12V auxiliary power system for your vehicle or camper, built to the same high standards we utilize for our custom installs. It includes a top-of-the-line lithium battery plus all the charging, monitoring, and fusing that we typically install in a custom installation.

The crooked box is built in a tough powder-coated aluminum box with aircraft grade hardware and an easily removable access panel making the entire system serviceable.