Quick answer: the first modern solar panel—often searched as 'first solar panels'—was demonstrated at Bell Labs in 1954. That date is the historical benchmark, not the company name “First Solar,” which was actually founded in 1999. If you're buying PV modules at scale, though, the bigger question isn't history. It's whether your supplier can prove what's in the box. After reviewing thousands of modules and auditing supply chains, I've learned that the OEM vs private label decision matters less than the manufacturer's willingness to be transparent about every spec.
I'm a quality and compliance manager at a solar module manufacturer. I review every delivery before it reaches customers—roughly 200+ shipments a year. In Q1 2024, we rejected a 5,000-module batch because the label spec didn't match the measured test data. The vendor claimed it was “within industry standard,” but our contract specified 0% tolerance on power rating. That redo cost us six figures and delayed the project by three weeks.
That kind of experience changes you. It took me about four years and 150 supplier negotiations to understand that technical specifications matter less than documentation transparency. You can get a great module from a low-cost factory if they'll send you the full test data. You can also get a terrible one from a well-known manufacturer if no one verifies what actually ships. (And I've seen both.)
The first solar panel was made in 1954—but that's not the whole story
According to the U.S. Department of Energy's historical timeline, the first practical solar panel was created at Bell Labs in 1954 by Daryl Chapin, Calvin Fuller, and Gerald Pearson. Their silicon photovoltaic cell converted about 6% of sunlight into electricity—enough to power a small radio, but nothing like modern panels. Later that year, they demonstrated it publicly, and the New York Times called it “the beginning of a new era.”
So when someone asks “when was the first solar panel made,” the standard answer is 1954. “First Solar,” on the other hand, is a company. According to First Solar's corporate profile, it was founded in 1999 in Tempe, Arizona, and it's known for thin-film cadmium telluride modules—the Series 6 and Series 7 families. The name is a coincidence that confuses people every day. First Solar isn't the first solar panel; it's a leading manufacturer of thin-film modules for utility-scale installations.
I'm not going to argue that thin-film is superior to crystalline silicon or vice versa. I've seen good and bad modules from both. What I will argue is that the technology choice is far less important than whether the manufacturer gives you reproducible, verifiable test data. That's not a marketing line—it's the operational reality of trying to guarantee performance across hundreds of megawatts.
Photovoltaic module OEM vs private label: what's actually different?
Now the part that confuses more than a few procurement teams: photovoltaic module OEM vs private label. In most industries, OEM means you hire a manufacturer to build goods exactly to your specification, and you sell them under your own brand. Private label usually means the manufacturer already has its own design or product, and you license it under your brand—often with fewer changes to the underlying spec.
In solar, the two terms get blurred. Some companies call any contract manufacturing “OEM” even when they're buying an existing module design from a factory. Others use “private label” to mean the same thing. But the distinction that matters for quality control is simple: who owns the specification? If the module is built to your custom spec, you need to define all the tolerances, materials, and testing requirements. If it's a private label version of an existing product, you're relying on the manufacturer's spec—and that's where you have to ask for the data.
In my first year in the industry, I made the classic rookie mistake: I assumed “same specifications” meant identical results across vendors. Didn't verify. It turned out each vendor had slightly different interpretations of open circuit voltage, temperature coefficients, even mechanical load ratings. Nothing failed catastrophically, but the mismatch caused a 45-day delay while we re-qualified the modules for a 200 MW project. A lesson learned the hard way: never assume the approval sample represents the final production batch. (Surprise, surprise—it doesn't always.)
During another audit, we noticed that a manufacturer used two different bills of materials for the same module SKU—one for their own label, one for private label. Both passed their internal tests, but the insulation film was 20% thinner on the private label version. They claimed the specs were identical; they weren't documented that way. You're gonna want to see those BOMs before you sign, not after.
So, OEM or private label? For large utility-scale projects, I generally lean toward OEM if you have the internal engineering resources to own the spec. You have more control over quality and you can audit the production line. For smaller projects, private label from a reputable manufacturer can be fine—provided you verify the test data and audit the factory yourself. There's no universal right answer. There is a wrong answer: buying without documentation.
Transparency builds trust (and avoids hidden costs)
Here's where the “transparency builds trust” point comes in. In my experience, the most reliable suppliers are the ones who list all fees upfront—including freight, testing, and potential wire charges—even if the total looks higher than a competing quote. I've learned to ask, “what's NOT included?” before asking “what's the price?”
A quote that hides the cost of bank guarantees, late-stage testing, or remediation until after you sign is not a bargain. It's a risk. I'm not naming any competitor or industry category; I'm just saying that hidden costs show up somewhere, and the project manager who signs the PO is the one who ends up explaining them.
This principle applies to module purchases just as much as to any other B2B buy. The supplier who says “here are our standard fees, and here's what could change—here's why” is worth more to me than one who promises the lowest price and then sends a change order a week before delivery.
“Transparency isn't a feature. It's the standard. If a supplier can't show you the spec, the test data, and the cost breakdown, you're not buying a product—you're buying a story.”
Does that mean the highest-priced bid is always the safest? No. But the most transparent bid—whether OEM or private label—is usually the one that protects both parties. (Unless the vendor is just listing charges to make the quote look big. I've seen that too.)
Boundaries, exceptions, and what to keep in mind
I want to be clear about the limits of what I'm saying. Transparency isn't the only factor in choosing a PV module supplier. For a 20-module residential system, you're probably going through a distributor, and you may not have direct access to the factory. That's okay; you can still ask for the certificate of compliance and test data before you buy.
Also, the 1954 Bell Labs story is fun, but it's not a purchasing guide. If you're evaluating First Solar modules, or any other brand, focus on: warranty terms, financial stability, bankability, and the manufacturer's track record in large deployments. The first solar panel may have only converted 6% of sunlight, but today's modules are more than 20% efficient. Yet efficiency isn't the whole story either—long-term degradation, temperature behavior, and warranty support can matter even more.
One more exception: if you're a startup trying to launch your own solar brand, a private label arrangement can be a smart first step. You avoid the huge investment in manufacturing engineering, and you can test the market risk. But don't skip the factory audit. I've turned down at least two deals because the “OEM partner” refused to provide validation data. Not ideal, but workable—you've just got to be willing to walk away.
And one final note on search terms: if you came here asking “when was the first solar panel made,” the answer is 1954. If you came here asking about First Solar panels as a product line, the company started in 1999. And if you came here comparing photovoltaic module OEM vs private label, the main thing to verify is who owns the specification—and whether the supplier is transparent enough to show you the proof.