One piece of solar panel for 2.5W can work for more than 15 years.
Light controller or time controller can prevent the panel from overcharge, overdischarge and output shortcircuit, it can also control the switch automatically according to the brightness. (the guarantee is 1.5 year)
Light source is produced specially by 16 ultra bright LED which can work for 50000 hours.
One piece of solar-use storage battery for 6V 4.5AH can work for about 2 years, the guarantee is 1 year.
The lamp body can be made by engineering plastic, cast aluminum, aluminum alloy, iron pipe, stainless steel etc.
Performance: If being fully charged, it can work for 5 continuous cloudy and rainy nights and each time it lights the whole night.
Surface spraying colour and electrical configuration can be designed according to customer requirements.