What happens to the power generated by your solar system is up to you! In many parts of the country, the government offers incentives to sell your energy back to your local utility. Alternatively, you can install a battery into your home to store the energy and use it yourself. What you choose will depend on what's best for your family.
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Understanding the details of how your system works will allow you to ask questions when you meet with your installer and help you understand the reasoning behind their recommendations. Best of all, it was easy! Panels absorb the sunlight and convert the energy to electricity, and inverters make the power suitable for use.