Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

Appliance Energy Cost Calculator

Find the true annual running cost of any appliance from its wattage, hours of use, days per week, your electricity rate, and how many units you run — the load solar has to offset.

Appliance power draw (W)

Hours used per day (h)

Days used per week (days)

Electricity price ($/kWh)

Number of identical units (units)

Solar Energy

Solar Load Calculator

Calculate the total daily energy demand of your home's lighting, appliances, and HVAC to correctly size a solar system. Use this before getting solar quotes to know exactly how many kilowatt-hours per day you need to generate.

Lighting Load (watts)

Appliances Load (watts)

HVAC Load (watts)

Average Daily Usage (hours)

System Efficiency Factor

Key differences

	Appliance Energy Cost Calculator	Solar Load Calculator
Category	Solar Energy	Solar Energy
Inputs required	5	5
Result	Annual running cost ($/yr)	Required Solar Capacity (kW)
What it does	Find the true annual running cost of any appliance from its wattage, hours of use, days per week, your electricity rate, and how many units you run — the load solar has to offset.	Calculate the total daily energy demand of your home's lighting, appliances, and HVAC to correctly size a solar system. Use this before getting solar quotes to know exactly how many kilowatt-hours per day you need to generate.