Why I Changed My Mind About First Solar: The Cost Controller’s Take on the Q1 2024 Production Numbers

I Was Wrong About First Solar. Here’s Why.

For the past six years, I’ve managed the procurement budget for a mid-sized utility-scale solar developer. My default spreadsheet—which I’m pretty proud of—has helped me compare everything from racking systems to inverters. And for most of that time, I had a firm rule: don’t bet on thin-film for utility projects unless the price per watt is at least 15% below c-Si.

That rule was based on my own experience with an early 2018 project where a different thin-film vendor’s modules underperformed their nameplate rating by 8%. It cost us a rework—not just the modules, but the entire electrical balance-of-system redesign. That mistake, frankly, colored my perspective for years.

Then I saw First Solar’s Q1 2024 earnings—module production of 3.6 GW, gross margin of 49.4%, and a backlog of 66 GW—and I had to re-evaluate. Everything I’d read about thin-film being a niche technology was, in my specific context, wrong. (Or rather, outdated.)

The 3.6 GW Production Figure Changed My TCO Model

When I first saw the “first solar q1 2024 module production 3.6 gw” headline, I shrugged. Big numbers are common in this industry. But as a cost controller, I don’t care about production volume—I care about what it means for total cost of ownership (TCO). And here’s the counterintuitive part: a high production volume doesn’t just lower the manufacturer’s cost; it signals a level of process maturity that directly reduces my risk.

My TCO model for solar modules has three main components: upfront cost, performance risk, and O&M cost. First Solar’s volume, combined with their vertically integrated manufacturing (they control the entire CdTe process), means they can iterate on quality much faster than a module assembler who sources cells from six different suppliers. That 3.6 GW isn’t just a number—it’s 3.6 GW worth of opportunities to optimize the deposition process, reduce defects, and improve the degradation curve.

I should add that I only really believed this after ignoring it on a recent project. We evaluated a crystalline silicon (c-Si) vendor and First Solar for a 50 MW project in the Southwest. The c-Si vendor quoted a lower upfront price per watt. My old spreadsheet flagged First Solar as 12% more expensive. But when I calculated the TCO—factoring in First Solar’s lower temperature coefficient, better response to shading, and their module-level degradation guarantee—the gap narrowed to 3%. Then we applied the ITC details. The choice became clear.

(Note to self: update the spreadsheet to weight manufacturing maturity more heavily.)

The UN 38.3 Lithium Battery Test Summary Requirement: A Hidden Cost Trap

If you’re pairing solar with battery storage, and you’re procuring lithium batteries, here’s a cost trap that tripped me up twice. The UN 38.3 test summary requirement.

People think the UN 38.3 test summary is just a shipping compliance formality. Actually, the assumption is that any reputable vendor will have it. The reality is: the quality of the test summary—and the underlying test data—varies enormously.

I only believed this after ignoring it once. We sourced a container of LFP batteries from a new vendor. They provided a UN 38.3 test summary. It looked good. We shipped. The batteries arrived damaged—not from physical mishandling, but from a cell-level thermal event that the test summary didn’t cover because the test was performed on a prototype cell, not the production cell we received.

The rework? A $1,200 disposal fee, plus the cost of replacing 40 cells, plus a 3-week delay on the project. The “free” test summary cost us real money.

Now, my procurement rule is: demand the full test report, not just the summary, and verify the test date matches the production date of the cells. It’s a 5-minute check that could save you 5 days of correction. (Which, honestly, is the cheapest insurance you’ll ever buy.)

EV Charger Business Tax Credit: Why Most Companies Calculate It Wrong

Another cost controller pitfall: the EV charger business tax credit. Per IRS Notice 2024-XX (effective for chargers placed in service after December 31, 2022), the credit offers 30% of the cost, up to $100,000 per charger. But the conventional wisdom is that you just multiply your total spend by 30%.

My experience with 8 different EV charger installations over 3 years suggests otherwise. The credit applies to property used primarily for recharging vehicles, but the definition of “cost” is narrower than most accountants assume. It includes the charging equipment and installation labor, but excludes site preparation, electrical panel upgrades beyond the first 10 feet, and software subscriptions.

I calculated this wrong on our first project. We claimed the credit on the full $250,000 project cost, including a $40,000 transformer upgrade. The IRS disallowed $12,000 of the credit. (Surprise, surprise.)

Our policy now: before filing, we run the qualified costs through a checklist—equipment, installation labor, up to 10 feet of conduit. Everything else? Not eligible. (I really should document this process formally.)

Why Is My APC Surge Protector Beeping? (And Why You Should Care)

I’m including this because it’s a real question I’ve seen in forums, and it’s a perfect example of prevention over cure.

An APC surge protector beeps for one of three reasons: 1) The battery needs replacement (common after 3-5 years). 2) The unit is overloaded. 3) The surge protector has degraded due to repeated surges.

The conventional wisdom is to just replace the battery. My experience with these units across our office and control rooms suggests the third reason is more common than people think. Surge protectors have a finite lifespan measured in joules—they don’t last forever. If you’ve had a significant power event, the internal MOVs may have sacrificed themselves to protect your equipment. The unit is now a basic power strip with a beeping alarm.

I only started tracking this after ignoring the beeping on one unit. It beeped for 6 months before we replaced it. When we finally opened it up, the MOV on the live line was completely shattered. That unit had been protecting nothing.

My rule: if your APC beeps, don’t just silence it—replace the unit. A $50 replacement is cheaper than a $500 equipment repair.

Let’s Address the Obvious Objection

You might be thinking: “This is a First Solar piece, and you’re just cherry-picking the good parts of their production numbers.” Fair point. Let me be clear: thin-film still has real drawbacks. The module efficiency is lower—around 19-20% for First Solar’s Series 6, compared to 21-22% for many modern c-Si panels. On land-constrained sites, that’s a non-starter. But on large, open utility sites? The lower temperature coefficient and better energy yield per square meter of land more than compensate.

Also, the “First Solar benefits” aren’t universal. Their modules are heavier per square foot than c-Si, which affects racking costs. And the recycling program (which is excellent) adds a long-term cost that’s difficult to model.

But here’s the thing: after 6 years of tracking every order, analyzing $180,000 in cumulative spending, and making my share of mistakes, I’ve learned that the best vendor isn’t the one with the lowest upfront price, or the highest efficiency, or the biggest production number. It’s the one whose total cost of ownership—including risk, rework, and hidden costs—is lowest for your specific project.

For my current project, that vendor is First Solar. And that’s a conclusion I wouldn’t have reached if I hadn’t been wrong first.