During a cloudy or bad weather days, your system will get some sun exposure and still produce a small amount of energy. It just would not produce as much energy as a sunny day because of the reduction in solar energy. Your solar system will not produce electricity at night as your system needs sunlight to produce energy. However, grid-tied systems have the power grid as a backup energy source so you’re never without power. If you are concerned about being off-grid during the night, we would be happy to consult with you on possible battery backup solutions.