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Solar electric systems are in many cases economically superior to conventional power systems. The operating costs are low because solar electricity needs very little maintenance, very few spare parts, and no fuel. There are no moving parts, so the system has a very long lifetime, and it is virtually maintenance-free.
Solar is a low-risk, high-return investment. No matter what size system you buy, or what percentage of your electric usage you offset, your, payback period will be relatively the same. It is all a matter of how much you can invest to hedge against rising energy costs.
Once your system is "paid back," you have $0 invested in your system, and a percentage of your electricity bill eliminated for decades.
Solar panels are installed on your roof or adjacent structure. These solar panels are made up of photovoltaic cells, which convert sunlight into DC power.
The DC power from the photovoltaic cells is sent to an inverter, where it is converted into AC power, or standard household electricity.
The AC power travels from the inverter to the electrical panel, or breaker box. This power is then available to service all of your electrical needs. The utility meter continually measures your electrical supply; when your solar system produces more power than you need, the meter spins backwards, racking up your credits with the utility company.
The utility grid remains in place to supply you with electricity when you need more power than your system has produced; this can happens at night.