... only 4% after using for 10000 hourscontrollerSRS patent Controller, Patent NO. ZL 2007 2 0058679.1, ... wire inside, especially used for SRS solar street lightWorking Temperature-30°C~~50°CReliabilityEvery night working, ... solar street lightsPolehot galvanization, with Paint/plastic finishSolar panel frameangle Iron, hot dip galvanized type, plastic-coating / painting1.Unique patented digital controller ...