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Solar Panel Calculator

Enter a few required parameters into the following calculator and estimate the number of panels, solar array dimensions, and area required to install a solar system.

Electricity Consumption

yr ▾

I know my solar hrs per day:

Country:

City(State):

Solar hours per day:

hrs. per day

Environmental factor:

Bill offset percentage:

Area of one panel

m² ▾

Your roof area

cm² ▾

Power output per panel

W ▾

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Solar Panel Calculator

Use the solar panel calculator to estimate the number of panels, panel size, and array area required to meet your home energy needs. You can also calculate solar power, panel efficiency, and the installation area.

Benefits of Solar Energy — Why Solar?

Improves air quality by reducing pollution
Generates green energy, lowering your carbon footprint
Reduces electricity costs
With net metering, extra solar energy can be sold back to the grid
Can reduce additional tax liabilities

How to Calculate the Number of Solar Panels

The number of solar panels you need depends on factors such as usable roof area, panel size, panel wattage, and the efficiency of photovoltaic cells.

Number of Panels:

Number of Panels = System Size / Single Panel Size

Solar Array Output:

Solar Array Output = Electricity Consumption / (365 × Solar Hours per Day)

Solar Array Size:

Solar Array Size = Solar Array Output × (Bill Offset / Environmental Factor)

Required Panels:

Required Panels = (Solar Array Size × 1000) / (Solar Hours per Day × Panel Output in Watts)

Required Area:

Required Area = Required Panels × Panel Width × Panel Length

Solar Panel Costs Per Watt

Grid-Tie Solar System:

Home connected to the utility grid. Reduces electricity bills and can work with solar batteries. Prices vary by panel type and size.

Off-Grid Solar System:

Independent system that powers your home entirely. Requires inverters or charge controllers to convert DC to AC for household use.

Installation Costs:

Typically ranges from $0.75 to $1.25 per watt. Use a solar panel cost calculator to estimate total investment.

FAQs

How to Determine Average Sun Hours per Day?

Peak sun hours indicate the time when sunlight provides 1000 W/m². Most areas in the U.S. receive about six peak sun hours per day. Use an insolation map or meter for accurate data.

How Many kWh Can One Solar Panel Produce?

On average, a single solar panel produces 170–350 watts per hour depending on efficiency and environmental conditions.

How Many Panels for 1000 kWh per Month?

You would typically need 24–25 solar panels to produce 1000 kWh per month.

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