What happens to your energy/hot water if you are using Solar Power and it’s cloudy for several days in a row?
I used to have a solar water heater 15-20 years ago and it worked OK when it was sunny (of course!). However, if it was cloudy/rainy for several days in a row, there was no hot water when it was needed the most.
Do modern systems work better, or is this still an issue?
Most Solar Water Heating systems are installed as a preheater to a backup water heater. The collectors heat the water in a super-insulated storage tank. The hot water output of that goes to the cold water input of a backup heater; electric, gas, oil, whatever. So on rainy days, the tank is insulated so it doesn’t lose much of the heat that it made, but it may send 90 degree water to your backup heater instead of the 50 degrees you get from the city or well. That’s 40 degrees less that the backup needs to heat, but still always provides hot water to the house. But on sunny days, your backup heater doesn’t need to turn on at all. Many people actually turn the backup off in the summer.
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