HQST 20 Watt 12 Volt Monocrystalline Solar Panel for DC 12V Battery Charging and Any Other Off Grid Applications Fully self powered off-grid systems can be used for various DC applications. High efficiency monocrystalline solar cells; small in size and easy to take. High quality glasses have capability of withstanding heavy snow and strong wind loads. Outstanding electrical performance under high temperature and low irradiance conditons. 25 years transferable output warranty and 5 years material and workmanship warranty.