The MNE250SMA-Quad Mstr This E-Panel works with 3 of the MNE250SMA-Slave E-Panels to create a Quad stack of Sunny Islands. The MNE250SMA-Quad Mstr master includes the Quad 125amp, 120/240vac input/output bypass system. This E-Panel can be used in conjunction with a Sunny Island inverter as part of a Quad off-grid, battery backup or AC Coupled system. Terminals are provided for hookup to leg 1 + 2 in the Slave E-Panels. Comes with 250amp battery disconnect breaker and inverter cables. Pre-wired with AC input and output wiring for leg 1 (master) inverter. (Three slaves are also required for Quad system.)