For a growing number of users, PV is the clear choice. You should definitely consider using a PV system if it operates better and costs less than the alternatives. The cost of energy produced by PV systems continues to drop. However, kilowatt-hour for kilowatt-hour, and depending on where you live, PV energy still usually costs more than energy from your local utility. Also, the initial cost of PV equipment is higher than that of an engine generator. But there are many applications for which a PV system is the most cost-effective long-term
The number of installed PV systems increases each year because their many advantages make them the best option overall. Consider the following issues:
Site Access - A well-designed PV system will operate unattended and requires minimum periodic maintenance. The savings in labor costs and travel expenses can be significant.
Modularity - A PV system can be designed for easy expansion. If your power demand could increase in future years, the ease and cost of increasing the PV power supply should be considered.
Fuel Supply - Supplying conventional fuel to the site and storing it can be much more expensive than the fuel itself. Solar energy is delivered free of charge!
Environment - PV systems create no pollution and generate no waste products when operating.
Maintenance - Any energy system requires maintenance, but experience shows that PV systems require less maintenance than other alternatives.
Durability - Most of today's PV modules are based on a proven technology that has experienced little degradation in more than 15 years of operation.
Cost - For many applications, the advantages of PV systems offset their relatively high initial cost.
System designers know that every decision made during the design of a PV system affects the cost. If the system is oversized because the design was based on unrealistic requirements, the initial cost is unnecessarily high. If less durable parts are specified, maintenance and replacement costs will increase. The overall system life-cycle cost (LCC) estimates can easily double if inappropriate choices are made during system design. Don't let unrealistic specifications or poor assumptions create unreasonable cost estimates and keep you from using this clean power source. As you size your PV system, be realistic and flexible, and select an experienced designer to assist you.