Solar battery chargers

Anybody have an idea how long one of these would take to recharge a deep cell battery? Lets say discharged down to ...ohhh...50% capacity on a sunny day. How about a lower wattage solar recharger than this one, what do you think the recharge time would be?

http://store.sundancesolar.com/5watsolsolpa.html

You could probably get a quick answer if you called the parts department of an RV dealership. They're very commonly used w/ RVs and RVs use deep cycle batteries.
Billy

it says .3A (and thats max at full light) most battery chargers do a trickle charge of 5A and they say to charge over night.... so you will need quite a few to do a full recharge. they make better and larger Solar panels but you going to be spending a few $100 on those....

And thats a 18 Volt solar cell....

Those should be called maintainers rather than rechargers..... With what they put out they are good for keeping your battery fully charged while not in use and not much more unless you go to the high $ units.

I had problems with one of my trucks which rarely got used battery being dead from the radios draw to keep the time and preset stations.
Put a solar charger on the dash of it and can go 3 or 4 months without the battery being drained.

had. one it only worked when the cigarette lighter was on so the current could get in,if your key is out it doesnt work

My 2000 also has a power socket nest to the cig lighter that is always hot!

Found the link where we talked about this before in depth: http://www.naxja.org/forum/showthread.php?t=978079&highlight=solar