Stand alone battery charger recommendations

With my old interstate grp 27 FLA we ran the generator/ Parallax converter 2 hrs a day for up to two weeks and put it on the auto charger when we got home. It's 4 years old and doing well. 5 or 6 hours and you should be fine until you get back.

I had two Shumachers and had to toss one when it started charging everything at 15v.The 2/12/70 is still going but I keep a eye on it. It or the Parallax isn't going onto the AGM's unless I have to.