Spend $750 now and SAVE $352 each year... ROI = 46.9%
In the winter, it is often dark out as employees head home, so you can make their walk back to their cars more enjoyable and safe without paying any electrical bills. Plus, the lights stay on all night for security and you do not need an electrician, since the lights run on a photocell and turn on automatically each night. The lights have minimal maintenance, and new technology offers more powerful batteries and brighter light. There are several options for bright spot lights to illuminate trees, but solar path lights typically give off about the equivalent in ‘lumens’ of a 60 watt bulb, and they typically run for about 11 hours each night.
The cost of solar lights is about $10 - $40 each plus about $2.50 per battery with a life of 5 years vs. traditional lights at about $15 each. So, you pay more, but at an offset cost per kWh of $0.98, the savings over time are significant. The ROI Calculation is based on using premium level $40 fixtures since the less expensive ones do not give off as high quality light (8 lights, 4 in the front and four in the back or any combination that is right for you). The calculation also factors in additional wire, additional batteries after five years, and a consideration to replace two of them if damaged by office deliveries or falling branches.