FieryRed 30W 12V Solar Panel Car Battery Charger & Maintainer, Portable Waterproof Trickle Charger with Built-in Controller, Cig Plug, Alligator Clips, USB-C, USB-A Outputs for Car, Boat, RV, Tractor

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• 【2-in-1 Solar Charger & Battery Maintainer】Perfect for car, motorcycle, boat, caravan and ATV. Effectively stop battery drain caused by long-time parking, avoid deep discharge damage and keep batteries always ready to start. Ideal for camping, road trips and seasonal vehicles. PLEASE NOTE: Upon FIRST use, MUST connect the battery to activate the circuit, and it's advised to measure the current(A) more accurately.
• 【Wide Battery Compatibility & Multi-Port Charging】30W foldable solar panel works with LiFePO4, AGM, lead-acid and lithium batteries. Built-in USB-A & USB-C PD ports support fast charging for phones, tablets and outdoor electronics to meet all outdoor power needs.
• 【High Efficiency Monocrystalline Solar Panel】Adopts Grade-A monocrystalline cells with 22%-30% high conversion rate for faster outdoor charging. Smart control box shows real-time power status, one-button battery type selection for simple operation.
• 【Foldable Lightweight & Easy to Use】Compact foldable design, easy to store and carry anywhere. Equipped with suction cups and D-ring clips for flexible installation. Comes with alligator clips, terminal rings and cigarette socket for multiple charging ways.
• 【IP67 Waterproof & Full Safety Protection】Durable ETFE surface is UV-resistant and anti-corrosion for tough outdoor use. Built-in overcharge, over-discharge and reverse current protection, ensures safe and stable long-term battery maintenance.
• 【How to Test Actual Charging Power】Upgraded control box differs from ordinary versions, no full disassembly needed for detection. Standard 30W solar panel specs: VMP 17.4V, IMP 1.73A with 90% conversion efficiency, actual total output reaches 27W. The practical charging current varies with real battery voltage, about 2A under 13.5V battery voltage. Simply test current in strong sunlight, then calculate actual charging power via battery voltage multiplied by measured current easily.