1High Efficiency: Solar panel has high conversion efficiency, good output efficiency, low light efficiency, and strong applicability. 2Features: Battery charger kit is light in weight, easy to carry, high stability, good durability, and improves work efficiency. 3Multi Purpose: 40A solar controller set can be used in automobiles, s, motorcycles, household appliances, etc. 4Good Flexibility: The battery charger kit is semi flexible and can be bent appropriately to use a wider range of applications. 5Wide Application: Suitable for car batteries, RVs, s, airplanes, satellites, space stations, outdoor breeding, planting, tourism, solar street lights, etc. Item Type: Solar Panel Solar Panel Size: Approx. 38cm / 15.0in Approx. 28cm / 11.0in Controller Size: Approx. 13.3cm / 5.2in Approx. 6.8cm / 2.7in Approx. 3.5cm / 1.4in Controller Rated Current: 40A Controller Rated Voltage: 12V (420W) ,24V (840W) Automatic (12V is Suitable for 18V Solar Panels, 24V is Suitable for 36V Solar Panels) Maximum Power (pmax): 15W Open Circuit Voltage (voc): 20V Maximum Power Voltage (vmpp): 18V Short Circuit Current (isc): 1A Maximum Power Current (impp): 0.75A Output: MC4 Feature: Without Power Storage Function Standard Test Conditions: AM=1.5, Irradiance=1000W/, Temperature=25 Weight: Approx. 742g / 26.2oz 1 x SolarPanel 1 x Accessories (1 Pack 4 Pieces) 1 x Solar Controller 2 x Chinese English User Manual Without storage function.