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When contemplating energy efficiency changes the following should be considered - What is my energy use now in term of time
- What is my energy use now in terms of watts
- What is my energy use now in terms of dollars
- What is the current maintenance costs
- What will be the capital costs of energy efficiency design changes
- What will be the new energy use cost in terms of watts
- What will be the new energy use cost in terms of dollars
- How long will it take before the extra investment in efficiency is returned
- How much money will I save?
- Some changes can be applied for free
I have created free online calculators to work this out before investment is made in efficiency changes These require JavaScript to be available Light Energy Calculator Any two lights technologies can be compared Device or Appliance Calculator This includes values for power usage when running and on standby Hot Water use and Cost Calculator Costs are based on electric storage water heater. Potential solar hot water saving values is also given. Computer or Laptop Cost Calculator This compares your computers versus typical Energy Star 4 desktop and laptops Efficient Computer Power Supply Calculator This is an external link Solar Power Calculator This calculates the final cost per kWh generated by solar power Electric versus Petrol Vehicle Calculator This could also be used for motorcycles, trucks, scooters etc.
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