News articles grab attention with stories that electricity utilities may want to turn off rooftop solar PV systems at times, and to turn off air conditioning systems at other times.
What you won't find are articles on how appliances provide options for individuals and businesses themselves to adjust their energy production and consumption to best support the electricity grid. These options do not require any power for electricity utilities to interfere in how people run their own homes and businesses.
How a Hot Water System can provide 4 kilowatt hours or more energy storage
Many hot water systems are designed to operate as follows:
- Heat water to a minimum of 60℃. This is to prevent the growth of harmful bacteria.
- Ensure water is delivered from the hot water system at no more than 50℃. This is to lower the risk of scald injuries.
- Optionally, heat water to a maximum of 70℃ or 75℃. This is to allow more hot water, at 50℃, to be available.
The delivery temperature of 50℃ is achieved by mixing the stored hot water with some cold water in a Temperature Limiting Device.
The amount of energy needed to heat 90 litres of water from 60℃ to 70℃ is 1 kilowatt hour.
A 360-litre Hot Water System, for instance, can be used to store 4 kilowatt hours of electrical energy by raising the temperature of water in it from 60℃ to 70℃.
There is no need to buy a battery to store energy if you own a suitable Hot Water System.
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