Hi Vic,
Yes, mine too are the SW5548 and I love them. They are heavy and just seem to keep on going with no complaints. And one heck of a charger..80 or amps I think. Yes, moved to the country, about 20 minutes from Vernon, BC and am loving it. So quiet and peaceful, and 20 acres to play on for my son and I. He's 10 and has an ATV, motorbike, go-cart etc and we are just now awaiting first snowfall....come on snow!!
If anyone wants a complete dissertation on battery charging, go to the Xantrex.com site and pick any one of their inverter/chargers, or solar or battery charger owner's manuals. They have excellent battery charging theory in there and how to properly charge flooded batteries. Actually, here is a direct link to one of the products I have, which works just great. Discontinued now which is too bad. Great battery info in it.
http://www.xantrex.com/documents/Discontinued-Products/Link20%28445-0196-01-01%29.pdfCheers
Paul