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

Solar Inverter Size Calculator

Estimates the recommended AC inverter rating for a solar array based on DC capacity, target DC-to-AC ratio, and headroom for future expansion. Useful for new-system design, retrofit planning, and matching inverter specs to anticipated panel additions.

Solar Array Capacity (W)

DC to AC Ratio

Future Expansion (%)

Fill in the required fields to see your result.

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

Fill in the required fields to see your result.

Key differences

	Solar Inverter Size Calculator	Solar Load Calculator
Category	Solar Energy	Solar Energy
Inputs required	3	5
Result	Recommended Inverter Size (W)	Required Solar Capacity (kW)
What it does	Estimates the recommended AC inverter rating for a solar array based on DC capacity, target DC-to-AC ratio, and headroom for future expansion. Useful for new-system design, retrofit planning, and matching inverter specs to anticipated panel additions.	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.