I might be able to help decipher their historic product line a bit, but some of it is far enough back that my memory isn't so clear....
Xantrex went on a buying spree back around 2000 or so. They bought two good companies with good products:
- Heart Interface, makers of the Freedom 10, 25, and maybe others. There was an RV version and a marine version. These were solid products, but I'm pretty sure all were modified sine wave.
- Trace, makers of the SW4025 along with a number of different variations, and also a DS or DT (or some other designation) line. The SWs were all pure sine wave and the DT were modified sine wave. I never used the DT line but I think they were good - just crude. The SW were excellent. I ran a house off one for 10 years, and still have it sitting in my garage as a backup.
They kept selling both products for a long time, relabeled as Xantrex, but destroyed the companies. The Trace guys left and started Outback.
Xantrex also bought pretty much every other little inverter vendor out there. I can't remember all the names, but there were a lot of them. Does anyone remember the names? ProSine was one, and is now the source of the total train wreck that they are today.
Somewhere along the way they did a refresh of the Trace SW product and botched it all up. It was pretty clear they had very little engineering skill internally. They also appeared to set out to consolidate and "value engineer" the product line. I think this is where they wrecked whatever products they had, though some of them may have been marginal to begin with.
Then somehow they created the XW line of commercial inverter/charger targeted at the off-grid market. I'm not sure where the engineering talent came from, but they are actually quite good products. An XW6048 has been running my house now for the past 5 years without skipping a beat. But what do you do with a good product line if you are Xantrex? Get rid of it fast - it might improve your reputation ;-) That's the product line that they sold to Schneider Electric, and it's still going strong.
What Xantrex has retained is the ProSine and ProWatt line which is utter crap, and they are useless when it comes to standing behind it. The horror stories are never ending.
Can anyone else fill in some of the blanks or add? I think the bottom line is that if you have a product that is from the Trace or Heart lineage, it's pretty good. Otherwise I'd get it off the boat fast. I also wouldn't touch the new "Freedom" products. As others have said, there are numerous good alternative like Outback, Magnum, Victron, and Mastervolt.