Sunforce 50022 5 Watt Solar Battery Trickle Charger

In the past after a couple of weeks in the hot Florida sun the battery on my boat would be dead. Now that I have connected the Solar charger battery has a full charge when I get ready to go. No having to plan ahead and connect a battery charger over night and disconnect the next morning before leaving.
Works Great Not a bad price either.

I am very happy with the overall performance of this solar cell. It provides a steady 400ma of current into my deep-cycle marine battery (I have two of them, each wired to a separate battery). This is plenty to keep the batteries topped of between visits to my boat. The only issue I had was one arrived broken due to some pretty light packing. Amazon made good with a quick, free return and replacement so not much harm done. Overall I am very happy with my purchase.

After a long winter in storage, my chassis battery (Ford Econoline 450) on my RV wouldn't stay charged for more than a couple of days. I bought this, put the panel on the dashboard and plugged it in to the cigarette lighter. Now it starts right up every time, even after a couple of weeks sitting idle. I haven't yet tried it with my house batteries, but I will be dry camping later this summer and will be able to see how it works for them. If I need larger ones for my house batteries, I will definitely look to Sunforce again.

I used this solar panel for my science experiment. Even though it was amorphus, it still provided excellent electricity for my cars that I used in the experiment. Though the panels produced little electricity, it was still very good and perfectly understandable. Amorphus doesn't really provide much electricity and probably won't be good to use for powering very intense electrical wares. But, if you are using this for an experiment that requires little energy, this is a great solar panel to use. It's also very cheap.

My wife's car got one for Xmas. The device was easy to install.
Unfortunately, without disconnecting the battery, it doesn't provide enough power to keep the battery charged in the winter, when sun hours are few, even in California.