This calculator will help you to size your on-grid system.  Enter the information as requested.

Step 1:

Kilowatt-hours (kWh) used per month:

Enter the monthly average from a 12 months electrical bill.

Portion of the total electricity desired to be solar:

Step 2:

Average sun hours a day for the location.

Select the state and city closest to the location

- Select a City - AK - Fairbanks AK - Yakutat AL - Montgomery AR - Fort Smith AR - Little Rock AZ - Tucson AZ - Prescott AZ - Phoenix CA - Santa Maria CA - San Francisco CA - Bakersfield CA - Fresno CA - Los Angeles CA - Daggett CA - Long Beach CA - Arcata CO - Eagle CO - Pueblo CO - Grand Junction CO - Boulder CT - Bridgeport CT - Hartford DE - Wilmington DC - Washington FL - Jacksonville FL - Key West FL - Miami FL - Tallahassee FL - Tampa GA - Atlanta GA - Savannah HI - Honolulu IA - Des Moines ID - Boise ID - Waterloo IL - Chicago IN - Indianapolis KS - Topeka KS - Dodge City KY - Lexington LA - Lake Charles LA - New Orleans LA - Shreveport MA - Worcester MA - Boston MD - Baltimore ME - Caribou ME - Portland MI - Saulte Ste. Marie MI - Lansing MN - St. Cloud MO - Columbia MO - St. Louis MS - Meridian MT - Glasgow MT - Great Falls MT - Miles City NC - Charlotte NC - Cape Hatteras NC - Greensboro ND - Bismarck NE - Omaha NJ - Newark NM - Albuquerque NV - Las Vegas NV - Ely NY - Binghamton NY - Buffalo NY - Albany NY - Syracuse NY - New York City OH - Columbus OH - Cleveland OK - Tulsa OK - Oklahoma City OR - Astoria OR - Portland OR - Medford PA - Pittsburgh PA - Erie PR - San Juan RI - Providence SC - Charleston SD - Rapid City TN - Nashville TN - Memphis TX - San Antonio TX - Brownsville TX - El Paso TX - Waco TX - Fort Worth UT - Salt Lake City UT - Cedar City VA - Richmond VT - Burlington WA - Seattle WA - Olympia WI - Green Bay WI - Madison WV - Charleston WY - Lander

or manually enter the average sun-hours for your location based on the solar map.

Step 3:

Based on your information, the total wattage required from solar energy is:

(Loses due to system inefficiencies, usually 30%, is already included in this value)

Step 4:

Solar panel selection:

Please Select 40 50 60 65 70 75 80 85 100 110 120 130 155 160 165 170 175 180 185 190 195 200 205 210 215 230 watts per solar panel. (Click here to chose the solar panel size that better suits your needs )

Conclusion:

You will need panels for a total of watts and sq.ft. area available.

You will need a On-Grid inverter this size:  watts 

Investment:

The numbers below are ballpark figures of your investment. Equipment and installation cost varies from region to region. Local regulation may also impact the overall cost. For the exact amount we must conduct complete assessment of you project. Please fill out the application form with the information required.

Total investment including accessories and installation can be as high as: $

The Federal tax credit is:  $

Each State may have different incentives. To find out click here  or call your State. Enter the total state incentives here:

Regional Utilities companies also may offer incentives. To find out click here or call your local utility company. Enter the total incentives here:

The remaining is the equity required: $ .

Special line of credit for green installations may be available. Ask your local bank on details.

Payback:

Enter the electricity unit cost as stated in your bill (dollar / kW/hr)

Your annual savings are: $

The number of years to payback your investment is: