... polycrystalline silicon,solar panel conversion efficiency can be up to 17%,20 years life,5 years guarantee.2. ... intelligent controller, switch on/off by light and time.Full power and half-power energy-saving mode, ... life,less than 10%light decline.5. work time:12 hours a day, continuous 3~4 rainy ... .6. pole: zinc-plated steel pole and coating to color of your choice, ss fasteners, 20 years life, 10 ...