Of the three, PV systems are most popular because of their low maintenance requirements and because of more consistent availability of solar energy. The economic choice between a power line extension and an alternative such as a PV system requires careful analysis and examination. A line extension usually involves a one-time major construction expense, plus monthly electric bills. However, the PV option will require replacement of storage batteries every three to 10 years, plus minimal maintenance during its 30-year life span. If a back-up generator is used to supplement the PV system, there will also be additional costs for its fuel and maintenance.
Cost effectiveness varies with geographic location.
The system design process is sufficiently complex that a computer program is often used to develop an optimized design, predict system performance and produce a cost estimate. This web page does not attempt to describe a complete design procedure but provides an overview of the design process. Engineering design services are charged by the hour and are refunded upon the purchase of the system.