How much electricity is saved by a solar hot water system?
13/03/25 09:46
- A typical hot water tank can be 100 gallons. On a typical spring, summer, or fall day, you could have a 40-degree change (heating) in temperature during the day. We know that water takes 2.47 watts per gallon of water to heat 1 degree F. So if you do the mathmatic: 100 gallons x 40 x 2.47 = 9,880 watts of energy or about 10 kW per day. That is a pretty big output. Most solar systems produce about 30-60kW per day. So, as you can see, hot water is one of the largest users of your electricity, or in this case, a solar hot water system saves a lot of energy that would heat water and lets it be used for other things.
Sitrad software shows the graph of each day water heating production and consumption.