# Calculate How Much Solar Power I Need?

What affects solar panel output efficiency? – Here’s where solar panel quality makes a difference. Not all solar panels are alike. Photovoltaic (PV) solar panels (most commonly used in residential installations) come in wattages ranging from about 150 watts to 370 watts per panel, depending on the panel size and efficiency (how well a panel is able to convert sunlight into energy), and on the cell technology.

1. For example, solar cells with no grid lines on the front (like SunPower ® Maxeon ® cells) absorb more sunlight than conventional cells and do not suffer from issues such as delamination (peeling).
2. The construction of our cells makes them stronger and more resistant to cracking or corrosion.
3. And a microinverter on each panel can optimize power conversion at the source, in contrast to one large inverter mounted on the side of the house.

Because of these wide variations in quality and efficiency, it’s difficult to generalize about which solar panels are right for you or how many you’ll need for your home. The main takeaway is that the more efficient the panels are, the more wattage they can produce, and the fewer you will need on your roof to get the same energy output.

1. Conventional solar panels usually produce about 250 watts per panel, with varying levels of efficiency.
2. In contrast, SunPower panels are known to be the most efficient solar panels on the market.
3. To figure out how many solar panels you need, divide your home’s hourly wattage requirement (see question No.3) by the solar panels’ wattage to calculate the total number of panels you need.

So the average U.S. home in Dallas, Texas, would need about 25 conventional (250 W) solar panels or 17 SunPower (370 W) panels.

## How long until solar pays for itself?

What is a Good Solar Payback Period? – The most common estimate of the average payback period for solar panels is six to ten years, This is a pretty wide range because there are many factors that will influence the number of years it can take to pay off your panels and the monthly savings you can expect.

For example, a larger solar installation is going to have a higher upfront cost, but higher monthly savings. And if the electricity rate from your utility goes up significantly, that can have a large impact on your long-term savings as well. Modern photovoltaic (PV) solar panels should last at least twenty-five years, with at least 80% efficiency at the end of that period.

Some new models of solar panels can last even longer than that. So, if your payback period is ten years, you are still looking at around fifteen years of additional savings on your electrical costs.

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#### How much power does a 12kW solar system produce per day?

How much does a 12kw solar system produce? – The amount of energy that a 12kW solar system produces each day (or month) will mainly depend on the following factors:

Location.Tilt angle and direction.Weather and season.

However, assuming the 12kW solar system is facing south, a system of this size would – on average – produce between 45 and 65 kWh of energy per day. This amount of energy equates to about 1400-2000 kWh of monthly energy production. To give you an idea, the following table estimates the average daily and monthly energy production of a 12kW solar system for different states in the U.S.:

 State Est. Energy Production per day (kWh/day) Est. Energy Production per month (kWh/month) Alabama 55 kWh/day 1700 kWh/month Arizona 65 kWh/day 2000 kWh/month Arkansas 50 kWh/day 1600 kWh/month California 60 kWh/day 1900 kWh/month Colorado 60 kWh/day 1900 kWh/month Connecticut 50 kWh/day 1500 kWh/month Delaware 50 kWh/day 1600 kWh/month Florida 60 kWh/day 1900 kWh/month Georgia 55 kWh/day 1700 kWh/month Hawaii 50 kWh/day 1600 kWh/month Idaho 50 kWh/day 1600 kWh/month Illinois 50 kWh/day 1600 kWh/month Indiana 50 kWh/day 1500 kWh/month Iowa 45 kWh/day 1500 kWh/month Kansas 50 kWh/day 1600 kWh/month Kentucky 50 kWh/day 1600 kWh/month Louisiana 55 kWh/day 1700 kWh/month Maine 45 kWh/day 1400 kWh/month Maryland 50 kWh/day 1600 kWh/month Massachusetts 45 kWh/day 1500 kWh/month Michigan 40 kWh/day 1300 kWh/month Minnesota 45 kWh/day 1400 kWh/month Mississippi 55 kWh/day 1700 kWh/month Missouri 50 kWh/day 1600 kWh/month Montana 45 kWh/day 1400 kWh/month Nebraska 55 kWh/day 1700 kWh/month Nevada 60 kWh/day 1900 kWh/month New Hampshire 45 kWh/day 1400 kWh/month New Jersey 50 kWh/ day 1500 kWh/month New Mexico 70 kWh/day 2100 kWh/month New York 45 kWh/day 1400 kWh/month North Carolina 55 kWh/day 1700 kWh/month North Dakota 45 kWh/day 1400 kWh/month Ohio 45 kWh/day 1400 kWh/month Oklahoma 55 kWh/day 1800 kWh/month Oregon 50 kWh/day 1700 kWh/month Pennsylvania 45 kWh/day 1400 kWh/month Rhode Island 50 kWh/day 1500 kWh/month South Carolina 55 kWh/day 1700 kWh/month South Dakota 50 kWh/day 1600 kWh/month Tennessee 50 kWh/day 1500 kWh/month Texas 60 kWh/day 1900 kWh/month Utah 55 kWh/day 1800 kWh/month Vermont 40 kWh/day 1400 kWh/month Virginia 50 kWh/day 1600 kWh/month Washington 50 kWh/day 1600 kWh/month West Virginia 45 kWh/day 1400 kWh/month Wisconsin 45 kWh/day 1400 kWh/month Wyoming 55 kWh/day 1800 kWh/month
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Estimated daily and monthly energy production of a 12kW solar system for different states. ( Source ) Please note that the information provided in the table was estimated using the PVWatts Calculator (provided by NREL ). The daily and monthly energy production will generally be higher in the summer and lower in the winter. Once you submit your address, the next step would be to change the default settings in the System Info section of the tool: In the System Info section, change the following settings: DC System Size (kW): In this case, the DC (Direct Current) system size is 12 kW (kiloWatts). Tilt (deg): This setting represents the tilt angle (roof pitch) of the section(s) of your roof on which you’ll install the solar panels.

Make sure it’s an unshaded roof section that’s preferably facing south. If the south-facing section of your roof is shaded or too small, go for the East, South-East, South-West, or West-facing sections. If you know the roof pitch of the section, you can click the ” i ” icon to determine its equivalent in degrees.

If you don’t know the roof pitch of the section, you can measure the tilt angle using an app such as Measure for iOS or Bubble Level for Android, Azimuth: Azimuth represents the direction that the roof section faces. For example, the azimuth for a south-facing roof section is 180 degrees, the azimuth for a north-facing section is 0 degrees.

Location: For the location, I’ll submit an address in Phoenix, AZ. DC System Size: 12 kW Tilt: For the tilt angle, I will assume that the solar panels are installed on a roof section that has a 7/12 roof pitch, which is equivalent to about 30 degrees. Azimuth: I’ll also assume that the roof section is facing South-East, which equates to 135 degrees.

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I’ve submitted these details to the calculator, and in the Results section, the following table was provided: Based on the location, the size of the system (12kW), and our description of the roof, the PVWatts Calculator has estimated the annual energy production to be 19650 kWh/year. You can also see that the monthly energy production differs from month to month.

### How many watts per square foot does a solar panel produce?

There are Four Maps Here: –

Average Yearly Sun – The first one shows the yearly average Best Case – The 2nd one is the “best case” or June Worst Case – The 3rd one is the “worst case” or December, With Tracking Mount – The 4th map shows the worst case ( January ) again, but with a tracking panel mount, which follows the sun.

For designing a system, you nearly always use the worst case, or December-January map. “Flat-plate collector” is simply a solar panel. The full set of maps (all 300 or so) are available at the NREL website:

Maps, solar radiation – These are the maps at NREL.

Some Definitions: kilowatt-hours per square meter: The earth at sea level receives about 1,000 Watts per square meter. If the map says 9 kWh/m2, then you are getting about 9 full hours of sunlight on the panel. Modern solar panels are around 15% efficient, so that works out to approximately 150 watts per square meter, or 15 watts per square foot.

### How much electricity do solar panels generate per square Metre?

Capacity – The maximum amount of electricity the system can produce under ideal conditions (known as ‘peak sun’). Sometimes called ‘rated capacity’ or ‘rated output’, this is taken to be 1,000 watts (or 1 kW) of sunlight for every square metre of panel. Most domestic solar panel systems have a capacity of between 1 kW and 4 kW.