Foretravel Owners' Forum For owners and Fans of Foretravel Motorcoaches September 12, 2025 ...

Parallax 775 ferroresonant converter/charger - any good?

May 05, 2011, 07:51:50 pm

After reading several topics about batteries and chargers I decided to find out what I had.  After much effort to get the unit out (see photo) I found I had a Parallax 775, a 75 amp ferrroresonant converter/charger.  This unit is very simple - a ferroresonant transformer and a diode bridge but their documentation claims that it will trickle charge a fully charged battery.  I don't know if I trust them.  Are these any good? 

Quote Selected

Re: Parallax 775 ferroresonant converter/charger - any good?

Reply #1 – May 05, 2011, 07:56:23 pm

John, I changed mine out and replaced it with an Iota 90 amp smart charger. It was under $300 and ended my battery issues. The Parallax was still charging and my son-in-law is still using it.

Quote Selected

Re: Parallax 775 ferroresonant converter/charger - any good?

Reply #2 – May 05, 2011, 10:25:32 pm

This will ruin your batteries.  It is not a multi-stage smart charger.

Quote Selected