Schumacher SP-400 4.8W Solar Battery Charger / Maintainer

• Maintains and extends the life of your 12 Volts auto, deep cycle, gel cell and heavy duty batteries
• Environmentally safe - no electricity needed
• Plugs into 12 Volts DC accessory outlet or directly to battery; includes battery clips and 12 Volts accessory plug
• Easy installation for permanent mounting - hardware included
• Manufacturer recommends using the SPC-7A solar charge controller (sold separately) in conjunction with the solar battery charger for added battery overcharge protection

This item works well and puts out quite a good amount of electricity even in non ideal lighting. You'll want the charge controller with this one if you intend to use it as a constant 12V battery trickle charger. I think this large one has the ability to overcharge, especially on very sunny days. The charge controller will prevent overcharge.

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This item has been multi purpose. I use this was a battery maintainer of my motorcycle and my lawn mower, charger and set up as emergency charging unit. I have configured this pannel charging for cell phones, charging the battery for a Ham radio(s). This unit also works well in vehicles, just place on dash, plug into the lighter plug and power the car radio with the key on and or use to charge the battery.......