A well-designed solar street light typically lasts 10–20 years 1 as a system. Expect panels 25–30 years 2, LEDs 50,000–100,000 hours (L70), controllers 5–10 years, and LiFePO4 batteries 8–12 years 3 depending on depth of discharge, temperature 4, and sizing margins.
Some roads across Barbados will soon be better lit following a donation of 180 solar lamps from the Hunan Province of the People's Republic of China to the Ministry of Transport and Works (MTW).