... , no manual operation, stable and reliable, saving electricity, maintenance-free, suitable for street lighting and decoration in small residential area, villas, parks ... can be set within a rechargeable battery, eliminating the need for trenching, backfilling and the purchase cost of the cable. 2 ... working 12 hours a day needs to consume 3000 kilowatt for ten years. 3. No need to replace light bulbs, ...