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【HIGH COMPATIBILITY】The 18V solar panel and charge controller form a basic off-grid solar kit for charging 12V batteries. Perfect for RV, cars, boats, hiking, camping, caravan, generator, solar water pump, etc. 【STURDY SOLAR PANEL】 The solar panel using grade A plus monocrystalline solar cells for high conversion efficiency. With a low-iron tempered glass and corrosion-resistant aluminum frame, the solar panel is protected against weathering and wear. 【DURABLE QUALITY】Corrosion-resistant aluminum frame withstand strong winds of 2400Pa and Snowload of 5400Pa. Both the IP67 junction box and IP67 solar cable connectors has an excellent waterproof function. Allows you to use it outdoors with confidence. 【PROTECT THE BATTERY】The 40A charge controller fully protect the battery and prevent it from over-charge, over-discharge, over-voltage, over-current, over-load, short circuit, reverse polarity, and over-temperature. The indicators for easy observation of charging and discharging status. With USB output port. 【ENERGY SURGE UP TO 33%】300W Monocrystalline Flexible Solar Panel of 23% conversion efficiency, with up to 91.5% transimittance, generates 858Wh per day.