500 watt solar panel

500-watt panels: a technology update not to miss

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Technology in the solar industry is advancing at a rapid pace. Solar equipment continues to become more powerful and more resilient while becoming less expensive. With so many news stories to track, it can be easy to miss the occasional new technology. But here’s a technology announcement that shouldn’t be missed: Trina Solar just released 500-watt panels. 

What is a 500- watt solar panel?

Among the most innovative of the solar industry’s developments in recent years is the 500- watt solar panel. The 500- watt solar panel was designed to meet the energy output needs of medium and large solar systems using fewer panels, ultimately increasing efficiency and lowering costs. Solar panels used to be much smaller than 500W (sub-300 Watts as recently as a few years ago), so these represent a pretty major technological improvement. There are two ways to increase the power of an individual panel: either to make it bigger (i.e., go from a 60 cell module to a 72 cell module that takes up a larger amount of space), or to increase the overall efficiency of the solar panel (how well it captures sunlight) by making improvements to the manufacturing process of the silicon cells, the solar panel itself, or both. A 500W solar panel is a major milestone because that level of panel efficiency/power output from a single solar panel would’ve been unheard of 10, even 5 years ago.

What manufacturers offer 500-watt solar panels?

The product landscape for 500-watt panels is slim, but will certainly grow over time. Two major players are Trina Solar and JinkoSolar.

Trina Solar: the Duomax and Tallmax V

Trina Solar, a Chinese manufacturer of solar panels, has been producing high-powered bifacial solar panels for some time now. Their two current lines of bifacial panels–the Tallmax and the Duomax–both boast power outputs of 500 watts, and are primarily engineered for larger, utility-scale installations.

JinkoSolar: the Tiger Pro

JinkoSolar entered the 500-watt solar panel game in 2020 with the launch of their Tiger Pro series. JinkoSolar is a solar manufacturer and supplier with an international presence in both commercial and residential solar spaces. Their Tiger Pro module has a power output of 585 watts at 21.4% efficiency.

How has panel wattage changed over time?

As recently as the first half of 2016, when we started tracking the wattages of individual panels quoted by our installer network; back then, a higher percentage of quotes included panels 300 watts or smaller than included panels 325 watts or larger. Today, most quotes on the Marketplace include panels around 340 to 360 watts. 

So to move past 400-watt panels and to 500-watt panels is rather impressive: a 50 percent increase above the most commonly quoted residential solar panel! 

It’s worth noting two factors that help the panel achieve this power rating. First, these panels are designed primarily for larger-scale installations, which means that the panels themselves are physically bigger than typical residential panels. Second, these panels are bifacial, meaning they can collect sunlight from both the front and back of the panels, increasing overall electricity produced. Bifacial panels are less frequently installed in residential applications. 

Will panels keep getting more powerful? 

There are two primary ways to make solar panels more powerful: increase their efficiency or increase their physical size. The most efficient solar panels available to the residential market max out at about 23 percent. For a standard residential-size panel, that means topping out at 425 watts. For every half percentage point or so that a panel efficiency increases, the power rating increases by about 10 watts. Already, this level of efficiency would have been unthinkable in solar panels just five years ago; if residential panels were to increase in efficiency by another 5 percentage points to 28 percent, that would likely produce a 525-watt panel or so. 

Alternatively, solar panels could continue to move from 60 cells to 72 cells and beyond, making larger and larger panels that physically occupy more space. While that would succeed in making higher power solar panels, it would also lead to system design or integration issues with larger and heavier modules. 

What can you do with higher watt panels?

Higher wattage panels open up a lot of possibilities. If you are space-constrained on your roof, installing more efficient and powerful solar panels can help you come closer to offsetting your electricity usage with your solar installation. 

For instance, a 20 panel installation of 300-watt solar panels–a 6 kilowatt (kW) system–may produce enough electricity to offset a $120 monthly electricity bill depending upon where in the country you live. A 20 panel installation of 400-watt panels, on the other hand, could potentially offset a $160 monthly electricity bill. 

What’s more, if you anticipate purchasing an electric vehicle or switching to air source heat pumps for your heating and cooling needs, higher wattage panels allow you to even oversize your solar panel system to meet that future need. 

Compare solar panel options on EnergySage

If you’re interested in comparing the wattages, efficiencies or sizes of different solar panels, check out the EnergySage Buyer’s Guide for an easy and free-to-use interactive tool to research different solar equipment. What’s more, the EnergySage Solar Marketplace pulls that information directly into any custom solar quotes you receive from local installers through our platform, allowing you to truly compare your options head-to-head.

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About Spencer Fields

Spencer is the Manager of Market Strategy & Intelligence at EnergySage, where he writes about all things energy. Prior to joining EnergySage, he spent five years at Synapse Energy Economics, providing environmental, economic and policy analysis for public interest groups. Spencer has degrees in Environmental Studies and Hispanic Studies from Brown University, meaning when he's not in the office you can find him outside or traveling somewhere to work on his Spanish.

10 thoughts on “500-watt panels: a technology update not to miss

  1. Steve HOCHMAN

    Spencer – I do solar and this sounds great. Can you tell me the logistics of how It works or direct me to someone who can please? I have several customers who live in high-risk zones (the red zones on the map). From what I understand if a customer. In the zones buys 2 Tesla power walls, for instance, they will literally get back $27,000 in rebates … I want to know how the customer is verified as eligible for the rebates, how rebates are applied for and how fast the money comes back to the customer


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