... maintenance-free.System componentsThe system consists of a solar cell component parts (including stents), LED lamp, ... receive 20% -30% more energy efficiency than ordinary solar street lights. Long life, once installed eight years ... solar panels, life expectancy ≥ 25 yearsBattery: Solar colloid, silicon, lead-acid batteries, life expectancy ≥ 5 yearsControllers: microcomputer intelligent controller, ...