My understanding is that the U series are w/o charger and the UXXXXSB for Stand By has the charger.
I just fail to add that in my post.
The SB models are identified by 3 different dip switches.
The non SB's have only one.
Getting old and trying to remember poop sucks...
there is a decent one in sacramento for $350, I'm guessing $275 would buy it. I believe it is not an SB.
Notice the red dip SW in the pic.
Have I confused myself yet....http://sacramento.craigslist.org/rvs/4311310679.html
PS Everything you need to know about some discontinued Trace Invertershttp://www.xantrex.com/power-products-support/document-downloads/discontinued-products/discontinued-products-inverter-chargers.aspx