ZERO BREEZE POWER EXTENSION DOCK (CONNECTS 2 BATTERIES & CHARGE BATTERIES WHILE RUNNING THE AC)

"Main Function Power the Mark 2 AC with one or two Mark 2 batteries in parallel while being able to be charged by the 24v power adapter or 24v solar panels. Specification: Charging Input: GX16-4 aviation connector, voltage range: 21-27V Output voltage: The higher output voltage from the optional two batteries."