Thus, in our above example, a 12, kWh consumption will need Instead, the number of residents and their energy habits play a much bigger role. With a panel wattage of and a production ratio of 1. The estimated consumption would then be 1, kWh per month or 13, kWh per year.
Again, considering a W panel and a 1. You can use the calculator below to quickly determine your solar panel needs based on your average monthly kWh usage and the nearest city from your house. The latter helps better gauge the amount of sunlight you receive based on your location.
Solar panel calculator. Alternatively, you can also figure out the number of solar panels you need based on the square footage. You can use the calculator below to get the predicted monthly kWh usage based on the number of people living in the house and their energy consumption habits:.
Once you get the estimated monthly kWh usage, simply plug it into the solar panel kWh calculator above. Apart from estimating how many solar panels you need, you should also consider the weight of the panels themselves. On average, a single panel weighs around 40 pounds, adding around 2. Therefore, you need to make sure that your roof can support this added weight. You also need to consider the material, age, and structure of your roof. Community solar programs are a common way for many homeowners, businesses and renters to go solar without actually installing anything on their roof.
Participants can subscribe to a nearby solar farm and pay a lower price for the electricity sourced from it. Interesting in seeing how much you could save by joining our community solar program? Reach out to us by visiting our community solar page or call us at Log In Contact Us Menu.
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Share on whatsapp. The solar hours per day table uses PV Watts calculations for each location using these input standards:. Find your Solar Hours per Day using the color-coding on this map. Enter the value for your location into the solar calculator. The solar map uses insolation, a measure of solar radiation energy received on a given surface area in a given time. The map shows the average daily total solar radiation throughout the United States.
The U. Solar Power Calculator 1. Enter the kWh used per year: 2. The amount of power kWh your solar energy system can produce depends on how much sunlight exposure your roof receives, which in turn creates your production ratio.
The amount of sunlight you get in a year depends on both where you are in the country, and what time of year it is.
For instance, California has more sunny days annually than New England. The California household needs about a seven kW system to cover percent of their energy needs. By comparison, the comparable household in Massachusetts needs about a nine kW system to cover their energy needs.
Homeowners in less sunny areas, like Massachusetts, can make up for this disparity by simply using more efficient panels or increasing the size of their solar energy system, resulting in slightly more solar panels on their rooftop.
In our long example at the beginning of this piece, we determined that an 8 kW system would probably cover the average energy use for an American household if you live in an area with a production ratio of 1. For California shoppers, this might actually be realistic, but for folks in the Northeast or areas with less sun, these estimates might be a bit high on the production end and low on the number of panels needed. Below is a table that will give you a sense of how much space your system will take up on your roof, depending on the power output of the solar panels you select.
Perhaps one of the most difficult aspects of sizing a solar panel array is estimating the annual amount of energy usage for your household. A number of larger consumer products or add-ons can significantly change your annual kWh requirements and greatly impact how many panels you will need. If your home is small or has an unusually shaped roof, the size of an actual solar panel can be very important to consider.
While those who have a large roof may be able to sacrifice some efficiency and buy larger panels to achieve the ideal energy output, homeowners with a smaller roof must be able to use fewer small high-efficiency panels to get an optimal output.
Today, the average solar panel dimensions for a residential home are about 65 inches by 39 inches, or 5. While solar panel dimensions have more or less remained steady over the past several years, the power output with the same area has dramatically increased.
In fact, many manufacturers like SunPower have reduced the size of gaps between panels and use invisible framing and mounting hardware to keep the panels tight, efficient, and aesthetically pleasing.
Check out the table below for a ballpark estimate of how many solar panels your home would need based on its square footage. By reviewing the various kWh requirements for everyday household appliances and products, one thing is clear: certain add-ons will dramatically change monthly energy use, and can have an outsized impact on the size of the solar panel system you should install.
For example, pairing your electric vehicle with solar panels is a great way to reduce carbon emissions and improve energy efficiency; however, it should be planned accordingly considering it could potentially double the size of your PV system.
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