Re: solar panel(s)
My only experience with a charger like that is we have an old beater truck on my sons acreage that has a very iffy battery in it and as long as that charger has been on it that thing will still crank like a fresh battery no matter how long the thing has been sitting. It simply plugs in the lighter and lay the charger on the dash. We also have a couple that Volkswagen used during shipping of vehicles. I have no idea who makes them but those will charge a run down battery in a day or two. They are only slightly bigger than the first one I commented on which looks like the one you are talking about.
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