... ,C, Life span, no rusting within 30 years.Solar panel: A, Solar panel, amorphous silicone,mono-crystalline silicone,poly-crystaline sillicone ... crystalline and poly-crystalline solar panel's Characteristic, conversion efficiency is high(15—19%),the size is small and the life ... consumer 15-20 of system power.B. intelligent digital controller can save >80% power than the regular solar garden lights.C, ...