Yes, solar panels still work on cloudy or rainy days, but their efficiency is reduced because less sunlight reaches the panels. Solar panels can generate electricity from indirect sunlight, but the output may be around 10-25% of what they would produce on a sunny day.

The amount of money you save depends on factors like your energy usage, electricity rates in your area, the size of your solar panel system, and available incentives. On average, homeowners save between 50% to 70% on their electricity bills. Additionally, many states offer tax credits, rebates, or net metering programs that can further increase savings.

Solar panels typically have a lifespan of 25-30 years. Over time, their efficiency may slightly decrease, but most manufacturers guarantee at least 80% efficiency even after 25 years. Proper maintenance, such as cleaning and inspecting the panels, can extend their lifespan.

Batteries are optional for most solar panel systems. If you want to store energy for use at night or during power outages, a battery system is necessary. However, many people rely on net metering, which credits you for the excess energy your solar panels send to the grid, allowing you to draw power from the grid when needed.