Solar Diverter Calculator
Version 1.01
Although best efforts have been taken to ensure accuracy, this utility may contain errors. Therefore, no warranty is provided.
Water Requirement
Number of family members
Number of family members
Average daily hot water requirement per member
L
Average daily hot water requirement per member
Total hot water requirement per year
litres
Energy Requirement
Typical minimum cold water temperature
°C
Typical minimum cold water temperature
Typical maximum cold water temperature
°C
Typical maximum cold water temperature
Average cold water temperature
°C
Hot water temperature required
°C
Hot water temperature required
Average temperature difference between hot and cold
°C
Energy required to heat one litre by that amount
kWh
Energy required to heat a year's worth of water
kWh
Gas Requirement
Boiler efficiency
%
Boiler efficiency
Gas required to heat a year's worth of water
kWh
Cost of gas per kWh
£
Cost of gas per kWh
Total cost per year not using a solar diverter
Electricity Requirement
Cost of solar diverter
£
Cost of solar diverter
Cost of installation
£
Cost of installation
Total investment made
Days in year with insufficient solar generation
Days in year with insufficient solar generation
Days in year with sufficient solar generation
days
Cost of gas per day to cover those days
Cost of gas per year to cover those days
Cost of electricity per kWh
£
Cost of electricity per kWh
Cost of electricity per day to cover those days
Cost of electricity per year to cover those days
Use gas or electricity to cover insufficient solar days
Gas
Use gas or electricity to cover insufficient solar days
Solar generation used to heat water each day
kWh
Total electricity not exported as a result
kWh
Price paid per kWh of exported electricity
£
Price paid per kWh of exported electricity
Lost export revenue
Total cost per year using a solar diverter
Payback Estimation
Number of years until payback of investment
Annual savings thereafter
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