The 12xxP series is permanent mount. I am not familiar with the 44021 but the 1220P, if I recall from reading the manual years ago, was designed to power your cruisers house equipment as well as maintain the batteries. Has readouts of voltage and charging amperage as well as options for many battery chemistries.
There are other fine chargers out there like Charles chargers but they run a little more $$. I have a 18 year old Charles charger on my current boat still going strong maintaining 6 batteries.
_________________ --2002 3880 Regal Flybridge | Twin Merc 8.1HO **Seven** --2003 AB 13 VST Console Inflatable | Tohatsu 40hp TLDI **Phish'n ski** --310 Mercury Inflatable | 1982 9.9 Johnson
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