If memory serves, I believe you are correct, Mike. Until its charging circuit went bad, we had a Xantrex Trace 2500w PSW inverter/charger. When we had it replaced several years ago by a Xantrex Freedom 3000w PSW inverter/charger, the tech had to install an AGS module. I think I remember he mentioned the Trace had its AGS built-in. BTW, the remote panel for the Trace would not work for the Freedom unit, so also had to be replaced.