How to Determine How Many Watts You Need to Power Your Home With Solar Panels

How to Determine How Many Watts You Need to Power Your Home With Solar Panels

Solar panels can provide electricity to power the lights and appliances in your house. Most panel systems are modular, so you only need to buy enough panels to meet the power requirements of your home. Solar panel output is measured in watts, so calculating the daily power use in watts for your home will give you the size of solar panel system to buy.

Instructions

    1

    List all of the items in your home that use electricity. Go room to room and list the lights and other electric powered items. Do not forget the large appliances and the heating and/or air conditioning system if they are electric.

    2

    Find the power usage in watts for each item on your list. Write the number of watts used next to the item on your list. Most electrical appliances or equipment will have a label showing the power draw in watts. For appliances and the air conditioning system you may need to find the owner's manuals for the power use information.

    3

    Estimate the amount of time each electrical item is in use each day. Write the time in hours next to the wattage of each item. For appliances that are on continuously such as a refrigerator, estimate the amount of time per day it is actually running.

    4

    Multiply the watts times the hours used for each item on your list. This is the daily power use in watt hours (WH) of each electrical item in your house. Add together the total of all the listed items for your daily power use. This is the number to calculate your solar panel requirements in watt hours.



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