It has a reverse blocking mosfet switch between the SOL- terminal and the BAT- terminal and a mosfet
switch between the LOAD- terminal and the BAT- terminal. There is also a low current mosfet switch
between the ‘G’ terminal and the BAT- terminal used to drive a generator control or alarm relay.
A.4.2 Block Diagram of PL60/80 Hardware
Note: Common positive configuration (ie switches solar and load in the negative wire)