Solar Panel Wattage Calculator

0.0(0)

Calculates the total wattage needed for solar panels based on household energy consumption and associated costs.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Monthly Energy Consumption (kWh), Average Sun Hours per Day, Solar Panel Wattage (Watts), Cost per Solar Panel (USD), Utility Cost per kWh (USD), Solar Panel System Lifespan (Years), and Federal Tax Credit (%) in the units shown.

Step 2

Read Daily Energy Consumption (kWh), Estimated Annual Savings (USD), Total Wattage Needed (Watts), Number of Solar Panels Required, Total Cost of Solar Panels (USD), Federal Tax Credit Amount (USD), and Net System Cost (USD) in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

Example calculations

See the inputs and their calculated results.

Small Household

Monthly Energy Consumption (kWh): 400; Average Sun Hours per Day: 5; Solar Panel Wattage (Watts): 300; Cost per Solar Panel (USD): 250; Utility Cost per kWh (USD): 0.15; Solar Panel System Lifespan (Years): 25; Federal Tax Credit (%): 30

Daily Energy Consumption (kWh): 13.33333333 kWh; Estimated Annual Savings (USD): 730 USD; Total Wattage Needed (Watts): 2,666.666667 Watts; Number of Solar Panels Required: 8.888888889 panels; Total Cost of Solar Panels (USD): 2,222.222222 USD; Federal Tax Credit Amount (USD): 666.6666667 USD; Net System Cost (USD): 1,555.555556 USD

Average Household

Monthly Energy Consumption (kWh): 800; Average Sun Hours per Day: 5; Solar Panel Wattage (Watts): 300; Cost per Solar Panel (USD): 250; Utility Cost per kWh (USD): 0.15; Solar Panel System Lifespan (Years): 25; Federal Tax Credit (%): 30

Daily Energy Consumption (kWh): 26.66666667 kWh; Estimated Annual Savings (USD): 1,460 USD; Total Wattage Needed (Watts): 5,333.333333 Watts; Number of Solar Panels Required: 17.77777778 panels; Total Cost of Solar Panels (USD): 4,444.444444 USD; Federal Tax Credit Amount (USD): 1,333.333333 USD; Net System Cost (USD): 3,111.111111 USD

Large Household

Monthly Energy Consumption (kWh): 1,200; Average Sun Hours per Day: 5; Solar Panel Wattage (Watts): 300; Cost per Solar Panel (USD): 250; Utility Cost per kWh (USD): 0.15; Solar Panel System Lifespan (Years): 25; Federal Tax Credit (%): 30

Daily Energy Consumption (kWh): 40 kWh; Estimated Annual Savings (USD): 2,190 USD; Total Wattage Needed (Watts): 8,000 Watts; Number of Solar Panels Required: 26.66666667 panels; Total Cost of Solar Panels (USD): 6,666.666667 USD; Federal Tax Credit Amount (USD): 2,000 USD; Net System Cost (USD): 4,666.666667 USD

People Also Calculate