Electricity costs money and the cost is going up all the time. Solar power is a viable way to create your own electricity and free yourself up from the electrical cost increases.
But solar power is not free. It costs money and the bigger the installation the more it costs. The more it costs the longer the payback period.
So it is important that you reduce your use of electricity and thereby reduce the cost of your solar power unit.
For some ideas on how to reduce your electric consumption see Solar Power Information – Some Ways To Conserve Electricity.