The adapter is specially made by Overland Solar for us.  It connects to the Mini (or Power Pole) connection on the MPPT Controller going to the battery, and has a black SB50 Anderson Coupler on the other end that plugs directly into the grey Anderson coupler on the National Luna Portable Power Pack or Auxiliary Battery Box. Add this adapter to the Overland Solar Bugout 130 with a 10 AMP Charge Controller Bundle for a complete portable solar solution.