Any solar panel that is rated 12W or higher requires the use of a charge controller to regulate the current and voltage to the battery. Charge controllers are able to prevent 12V batteries from overcharging or discharging, and reduce overall maintenance to help prolong battery life. Choose this 8A plug-n-play charge controller for up to 120W of solar charging. They work with all 12V batteries and solar panels.
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Comments about Rdk Products 8 Amp Charge Controller, Dim 5 x 4 x 1 1/2, 120W/8A:
Here is how I put together my solar charging system. One: RDK PRODUCTS 15W Semi-Flexible Monocrystalline Solar Panel. The solar panel was mounted on my t-top. Made my own Y-connector so I could run a charge controller to each battery. Two: RDK PRODUCTS 8 Amp Charge Controller, Dim 5" x 4" x 1 1/2", 120W/8A. The charge controllers were installed in the center console. All connections were silver solder and then adhesive-lined heat shrink tubing. Ring terminals directly to the battery terminals with dielectric grease. The system is working brilliantly for now. The charge controllers don't look to be marine grade not sure how long they will last. Only time will tell.