Don't get fooled by specs. A solar panel rated at 4 watts will rarely put out more than 2.5 watts in bright sunshine. That 4 watts is basically theorectical and only happens in rare situtions with extreme cold weather and a few other factors like snow cover and high reflection. Solar panels over-produce in cold temps. Long story short - a 4 watt panel is worthless for what you want. If you have a lot of sun, it could be used as a battery maintainer, not a charger.
Also, 6 volt panels are not common. Even 12 volt panels are getting a bit scarce, as 24, 48, and 72 volts become more common. You might need a controller if you buy certain panels - and with a controller - you have more loss.
Take tha 2.5 watts - and you've got less then 1/2 amp at 6 volts - which isn't much.
I live in a poor sunshine area of New York, and I have several solar battery maintainers for tractors that spend most of their lives sitting. I use 15 watt panels and they work well enough to maintain batteries that are already charged. Not to charge run down batteries.
You can buy some pretty good 15 watt panels with battery cables for $60 if you shop around.
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Today's Featured Article - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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