I bought 28 of these panels (not on Amazon) and I think they're an amazingly good panel for the money. They are amorphous which means they charge in diffused sunlight not just direct sunlight.I set up three of them on the deck in February on an overcast day and hooked them up to a discharged car battery. With my voltmeter I could tell they were putting out around 24 to 25 volts each and sure enough, the battery went from 10.4 volts (way too dead to even turn over the engine) to 12.5 volts (fully charged) by evening.
With solar panels it's dollars per watt that counts for comparison. Right now, anything that sells for about 2 bucks per watt is a good deal which is what I paid for mine. I could have bought two 100 watt panels, but I'm planning on putting my panels on roof mounted tilting axis poles so they can track the sun, and these panels are only 16" wide so the pole can be mounted very close to the roof and still get a high degree of tilt in either direction for tracking, but still be low enough not to get blown off by any nasty winds.
And panels are easy to link. Just connect the wires together in parallel (all the red wires to one big wire, all the black wires to one big wire) to increase your amperage. Each one puts out .58 amps so my 28 panels should provide just over 16 amps of charging power with a charge controller in line that will be plenty to fast charge a couple of deep cycle batteries and run lots of small appliances with an inverter.
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