What is the power output of a solar panel?

power output of a solar panel

Power output or wattage is an important factor to consider when comparing solar panel options. You may hear your solar installer say, “it’s a 255 Watt panel” or “the panel I am recommending is has a wattage of 300.” Or, when you are reading a quote from a solar installer, you might see numbers like 245W, 300W, or 345W next to the name of the panel. They are all referring to a solar panel’s wattage, capacity and power output. So, what is the typical output of solar panels?

All solar panels are rated by the amount of DC (direct current) power they produce under standard test conditions. Solar panel power output is expressed in units of watts (W), and represents the panel’s theoretical power production under ideal sunlight and temperature conditions. Most home solar panels on the market today have power output ratings ranging from 250 to 400 watts, with higher power ratings generally considered preferable to lower power ratings. Pricing in solar is typically measured in dollars per watt ($/W), and the total wattage of your solar panels plays a significant part in the overall cost of your solar system.

Why does solar panel power output matter? How to calculate panel wattage

Power output is an important metric for your home or commercial solar panel system. When you buy or install a solar photovoltaic (PV) energy system, the price you pay is typically based on the total power output of the solar panels in the system (expressed in watts or kilowatts).

Solar panel wattage represents a solar panel’s theoretical power production under ideal sunlight and temperature conditions. Wattage is calculated by multiplying volts x amps where volts represents the amount of force of the electricity and amperes (amps) refers to the aggregate amount of energy used. The financial savings you derive from the solar system is a result of the electric energy that it generates over time (expressed in kilowatt-hours).

Size vs. quantity: typical solar panel ratings and capacity

Power output on its own is not a complete indicator of a panel’s quality and performance characteristics. For some panels, their high power output rating is due to their larger physical size rather than their higher efficiency or technological superiority.

For example, if two solar panels both have 15 percent efficiency ratings, but one has a power output rating of 250 watts and the other is rated at 300 watts, it means that the 300-watt panel is about 20 percent physically larger than the 250-watt panel. That’s why EnergySage and other industry experts view panel efficiency as being a more indicative criterion of solar panel performance strength than solar capacity alone.

big power output means big solar savings

In practical terms, a solar panel system with a total rated capacity of 5kW (kilowatts) could be made up of either 20 250-Watt panels or 16 300-Watt panels. Both systems will generate the same amount of power in the same geographic location. Though a 5kW system may produce 6,000 kilowatt-hours (kWh) of electricity every year in Boston, that same system will produce 8,000 kWh every year in Los Angeles because of the amount of sun each location gets each year. (Read our blog on how electricity production and electricity prices you pay to your utility impacts your savings.)

The electricity generated by a solar PV system is governed by its rated power output, but it’s also dependent on other factors such as panel efficiency and temperature sensitivity, as well as the degree of shading that the system experiences and the tilt angle and azimuth of the roof on which it’s installed. As a general rule of thumb, it makes prudent financial sense to install a solar system with as much power output as you can afford (or that your roof will accommodate). That will ensure you maximize your savings and speed up the payback period of your solar energy system.

Find out more about average prices for solar across the country for 3kW,4kW5kW6kW, 7kW8 kW and 10kW solar systems.The EnergySage Solar Marketplace makes it easy for you to compare your savings from solar panels with various power output ratings.

How many watts does a solar panel produce?

The two graphics below present different views of power output from the leading manufacturers who supply solar panels to the U.S. market. Because panel manufacturers often produce more than one line of solar panel models, the power output of most company has a significant range. Figure 1 illustrates the range of power outputs offered by each manufacturer’s panel products, and Figure 2 lists the minimum, maximum, and average power outputs of the solar panels within each manufacturer’s portfolio.

Solar panel electricity production by manufacturer

Figure 1:   Range of power output of solar panels manufacturers

solar panel power output by manufacturer


Figure 2: Power output (in Watts) of solar panel manufacturers


Solar Panel Manufacturer




Canadian Solar225325279
China Sunergy290320306
ET Solar250340295
Green Brilliance230300266
Itek Energy270310290
REC Solar240320267
Renogy Solar250300268
Trina Solar Energy250345287

Three Tips for Solar Shoppers

  1. Homeowners who get multiple quotes save 10% or more

    As with any big ticket purchase, shopping for a solar panel installation takes a lot of research and consideration, including a thorough review of the companies in your area. A recent report by the U.S. Department of Energy’s National Renewable Energy Laboratory (NREL) recommended that consumers compare as many solar options as possible to avoid paying inflated prices offered by the large installers in the solar industry.

    To find the smaller contractors that typically offer lower prices, you’ll need to use an installer network like EnergySage. You can receive free quotes from vetted installers local to you when you register your property on our Solar Marketplace – homeowners who get 3 or more quotes can expect to save $5,000 to $10,000 on their solar panel installation.

  2. The biggest installers typically don’t offer the best price

    The bigger isn’t always better mantra is one of the main reasons we strongly encourage homeowners to consider all of their solar options, not just the brands large enough to pay for the most advertising. A recent report by the U.S. government found that large installers are $2,000 to $5,000 more expensive than small solar companies. If you have offers from some of the big installers in solar, make sure you compare those bids with quotes from local installers to ensure you don’t overpay for solar.

  3. Comparing all your equipment options is just as important

    National-scale installers don’t just offer higher prices – they also tend to have fewer solar equipment options, which can have a significant impact on your system’s electricity production. By collecting a diverse array of solar bids, you can compare costs and savings based on the different equipment packages available to you.

    There are multiple variables to consider when seeking out the best solar panels on the market. While certain panels will have higher efficiency ratings than others, investing in top-of-the-line solar equipment doesn’t always result in higher savings. The only way to find the “sweet spot” for your property is to evaluate quotes with varying equipment and financing offers.

For any homeowner in the early stage of shopping for solar that would just like a ballpark estimate for an installation, try our Solar Calculator that offers up front cost and long term savings estimates based on your location and roof type. For those looking to get quotes from local contractors today, check out our quote comparison platform.

big power output means big solar savings

14 thoughts on “What is the power output of a solar panel?

  1. Ed

    Thanks for an informative article. I am in the process of planning to install a pv system and the company I chose have just let me know that they can’t get the Solar World 255W monocrystalline panels but will supply 250W (same size) instead. Not too happy about this – am I justified in feeling this way? They did say they would adjust price accordingly but I feel that perhaps 255W is even too little for is actually available on the market today …

  2. Rick kieckhefer

    The average for solar panels in exhibit 2.
    Is this an annual figure, a monthly figure?
    I just had 17 LG solar panels installed

    It would be great to hear from you via email.

    Thanks, Rick

  3. Pingback: Solar Panel Hidden Benefits Means Power Output Creating Motion

  4. Faris

    I think a more important characteristic is power output per area of solar panel (W/m^2). I mean a bigger solar panel can produce higher power output so it’s not realiable parameter.

  5. Timothy Potter

    I just had 28 LG 320s solar panels installed to produce 14792 KW a year for 40,000.00 (13000.00 back at tax time, hopefully I didn’t get ripped off)

    1. Ed

      I think you got ripped off. I got a quote for 29 LG 320’s with 29 enphase microinverters for 27,500 plus sales tax.

  6. Douglas Higden

    Why not rate panels on a watts per installed square foot or meter? Then apples to apples comparisons can be made.

  7. Mohammed Nambath

    Hi Dear Timothy,

    I would like to know which serial panel you brought from LG. I am planning to install the solar system. If you can help its very help full for me. if you can please send me my personal mail some images.
    My Email given below.
    mohammed Nambath

  8. Don

    No mention anywhere of the size of these arrays. How many square meters? A long wordy article that fails to give the necessary information.

  9. Galiwango Simon Peter

    hello am going to monitor a domestic installation of a solar panel system at our home. i would like to know how many loads it can handle at maximum capacity in good service. Its ratings are; 255W, 38V and 8A. It’s one panel with a very large size approximately 8ft by 4ft.
    Please advise me accordingly

  10. Danny

    I’ve just made a purchase from SolarCity to get 21 Trina 295 watt solar panels for $20900 installed. A 6.2 kilowatt system. I wonder if that is a decent deal?

  11. Johnny B

    Solar output is a factor of so many things. That being said, what is realistic based on the location if installed in a peak direction, proper angle etc. Estimators and installers work from basic specs. That being said, what can one expect to generate, if a roof installation (again ideal) in an East coast city with full sun using (30) 310 watt Winaico solar panels, 60 generating cells in each panel with an 18.6% efficiency (according to the manufacture). I have this system and must admit it works great, but I have problems with numbers and expectations. As quoted to me the generation at PEAK is 9.3 kWp. Using that #, should I see that output daily, weekly, monthly or yearly on AVERAGE. Granted, not every day is sunny, but do I have an expectation to see at least 9 kW once in awhile. I have not taken the efficiency rating into consideration and that may be the issue. Thanks


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