I am wanting to add a solar battery charger to my TT. I would like to keep the battery at full charge while in storage, ther are no electical outlets near the TT. The TT uses a single battery deep cycle type. I would like to leave the battery hooked up and hot to the TT. I hope I made my self clear about what I am trying to do.
What size solar charger do I need?

You want to contact an RV solar company and they will tell you exactly what you need for a panel size and controller.

I agree with Fred, contact some solar suppliers.  Here is one that has been in business for a while:  http://www.amsolar.com/

Jack Mayer's info at http://www.jackdanmayer.com/rv_electrical_and_solar.htm might be overkill for this application, but it should get you started. A bit more info: The cheap controllers do not do a good job of keeping batteries well charged since they do not provide enough voltage or multi-stage charging. Something like this controller, http://www.morningstarcorp.com/en/sunsavermppt would work well and have some expansion but might be out of your price range since the best price I found was about $200 here - http://www.nationalsolarsupply.com/index.asp?PageAction=VIEWPROD&ProdID=936&HS=1. If you just want to go cheap than this one and a 45 to 75-watt panel would probably be adequate - http://www.discountpv.com/charge_controllers/sg4-12v.htm and it is $29. You also might be about the only person I know that the Harbor Freight 45-watt system, http://www.harborfreight.com/45-watt-solar-panel-kit-90599.html, at $230 + tax, might be enough. Don't expect to expand it.

Thanks guys I will look into these. Dan