No offense, but it's clear from your posts that you haven't a clue about DC systems on your boat. The charger
you referred to has a charging
capacity of 1.25A on each of two legs, for a total of 2.5 amps
We were talking about a DLS-75/IQ/4 which has a charging
capacity of 75 amps
, or 30 times as much!
Since you have a Freedom 20 aboard (with a charging capacity of up to 100 amps), I assume that you have a healthy sized battery
bank to go along with it.
You'd really be best served by buying
and reading a good text on 12VDC systems. Charlie Wing's book is a good one. If you don't want to do the work, then get a professional marine
electrician to advise you. It would likely save you a lot of $$$ in the long run.
This is particularly advisable if you have AGM
house batteries, as suggested by your last remarks, since these require special charging setups so as to obtain maximum efficiency and avoid doing damage to, e.g., your engine's alternator