I also just replaced my Freedom 458 MSW about a month ago with a Magnum MS2800 PSW for exactly the same reason--a malfunctioning charger. I was able to get one from Amazon at a really low price (like $300 less than anyone else), but they're currently out of stock. I decided to step up to the 2.8kW unit to improve overall efficiency since item is rated at >90% efficient when running at the 500-1,000 watt level.
The replacement of the Xantrex by the Magnum was easy; the form factor for both is about the same and the connections are in roughly the same locations so existing cable lengths worked. The Magnum's remote panel uses the same telephone wire and RJ connectors so I could use the one that was already in place.
The only significant installation difference is that the 2800 series Magnum doesn't come with a built-in subpanel which was a plus for me. We mounted a small subpanel in an easy to get to location so now I don't have to crawl into the basement to reset the breakers if we trip them.
Magnum is using what is essentially a 4-stage charging approach; the unit goes to sleep after ~4 hours of float charging until it detects a drop in battery voltage to a predetermined level. During the sleep period it completely stops charging the battery as a way of reducing water loss.
Sandie & Joel
2000 40' Beaver Patriot Thunder Princeton--425 HP/1550 ft-lbs CAT C-12
2014 Honda CR-V AWD EX-L with ReadyBrute tow bar/braking system
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