500 watt solar panel

Technology updates not to miss: 500-watt panels

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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. 

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Trina Solar’s 500-watt panels

Trina Solar, a Chinese manufacturer of solar panels, recently leaned into producing high-powered bifacial solar panels. Their two current lines of bifacial panels–the Tallmax and the Duomax–boast power outputs of above 400 watts, and are primarily engineered for larger, utility-scale installations. 

Building upon this existing technology, Trina Solar announced at the end of February 2020 that the company has iterated on these two current product lines with impressive results, reporting a 500-watt power output on both the newly launched Duomax V and the Tallmax V. 

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 either 320 or 330-watt panels, as seen in our ninth Intel Report

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.

7 thoughts on “Technology updates not to miss: 500-watt panels

  1. AvatarSteve 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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