On average, it often takes between 6 to 10 years for homeowners to recoup their initial investment through reduced energy bills.

As of my last update in September 2021, the cost of a solar installation can vary widely based on factors such as location, system size, equipment quality, and available incentives. On average, the cost could range from $15,000 to $30,000 or more for a 1800 sq ft home, before any incentives or tax credits.

Yes, you can often sell excess energy generated by your solar panels back to the grid, depending on your location and the policies of your utility company. This process is known as "net metering" or "feed-in tariff" (FIT) programs, and it varies from region to region.

1. Energy Independence: Batteries store excess energy generated by your solar panels, allowing you to use it during the evening or during power outages, reducing your reliance on the grid.

2. Maximized Self-Consumption: With a battery, you can store excess solar energy and use it when the sun isn't shining, maximizing the amount of energy you directly consume from your solar system.

3. Time-of-Use Optimization: If your utility company has time-of-use pricing, you can use stored battery energy during peak hours when electricity costs are higher, saving money on your bills.

4. Backup Power: A battery provides backup power during grid outages, ensuring essential appliances like lights, refrigerators, and medical equipment keep running.

5. Grid Support: Batteries can help stabilize the grid by supplying stored energy during times of high demand, reducing strain on the electrical infrastructure.

6. Reduced Demand Charges: For commercial users, batteries can help manage peak demand, reducing demand charges imposed by utilities during high usage periods.

7. Environmental Impact: Using stored solar energy from your battery reduces your reliance on fossil fuels, further contributing to a lower carbon footprint.

8. Flexibility: Batteries allow you to shift energy usage based on your preferences and needs, giving you more control over your energy consumption.

9. Hedging Against Future Costs: If energy prices rise, having a battery can help you rely more on stored energy and less on grid electricity, protecting you from potential price increases.