efficiency 400W portable solar kit for 12V battery charging, designed for reliable outdoor power Key benefits Efficient charging for 12V batteries using monocrystalline silicon panels with 22 percent to 24 percent conversion efficiency. Compact and lightweight design for easy transport and installation. Includes a 40A controller to manage charging and protect the battery from overcharge. What it is Two 200W monocrystalline solar panels providing 200W each, suitable for charging 12V battery systems when combined. A 40A controller included to regulate power and support safe charging. Performance and technical specifications Color black Material monocrystalline silicon Size 775 x 500 mm Peak power 200W x 2 Open circuit voltage 21.6V Short circuit current 8.9A Peak power voltage 18V for charging 12V battery Peak power current 8.5A Battery conversion efficiency 22 percent to 24 percent Nominal working battery temperature NOCT 45 to 80 Weight 2 kg Controller rating 40A Function and compatibility Designed primarily for 12V battery systems; peak power voltage of 18V matches common 12V charging requirements. The included 40A controller ensures compatible management of panel output and battery charging. Practical use scenarios Camping and RV power up to run lighting, small appliances, and charge batteries while off grid. Marine and boating applications for maintaining house batteries and auxiliary systems. Remote cabins, sheds, or outdoor equipment where reliable 12V battery charging is needed. What is in the box 2 x 200W solar panels 1 x 40A controller Important usage notes Do not scratch the surface of the solar panel with sharp objects. Place panels in direct sunlight for the charging speed. Do not leave the charger exposed in rainy conditions to avoid risk of short circuit. Simple setup tips Position both panels facing direct sunlight and avoid shading for maximum output. Use the included 40A controller between the panels and the battery to regulate charging. Monitor connections and keep the panel surface clean and of debris for consistent performance.