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All-Weather Solar Charging with Smart Controller that prevents overcharging - Harness solar power with a rugged 20W panel with the smart charge controller converting power to efficient pulses and acurately regulates charge to your vehicle's battery, deliverered through the in-cabin OBDII port. DUO technology compatible with all 12V batteries - the smart controller is compatible with 12V lead-acid batteries, including AGM ,GEL, STD types and 12.8V lithium (LFP / LiFePO4). Plug & Play Simplicity inside the vehicle's cabin - Place the panel in position* and connect to the battery through the vehicle's OBDII diagnostic port located below or adjacent to the steering wheel (position varies by vehicle brand / model). * POSITION: use included suction mounts to afix panel on the inside of the front windshield, or flip suction mounts to use as support pads for dashboard or rear tonneau cover (SUV) placement. Safe to leave connected for days, weeks or months - The smart charge controller's automatic multi-step program brings the battery to full charge and then delivers 24-7 'connect and forget' maintenance at the recommended level for a 12V battery. Overnight the controller indicates battery charge status. Rugged & long lasting, works in extreme temperatures - Durable, weatherproof solar panel, smart controller & battery connection accessories delivers reliable & smart off-grid battery maintenance even if your vehicle is stored in freezing temperatures down to -40. Includes nylon zipper bag to store the kit when the vehicle is in use.