Are solar panels useless on cloudy/rainy days?
No. Solar panels still produce power on cloudy and rainy days, just much less than in full sun. On a heavily overcast day a typical home system will usually still cover background use like the fridge, standby devices and lighting, but not big loads such as a spa or heater. Panels work best in full sun, and the sunny months more than make up for grey days across the year. A battery helps by storing power from the sunnier hours for use when production drops.







