Series 6 Plus bifacial module from First Solar Inc. - utility-scale efficiency with thin-film edge

Reviewed: ad hoc news Classics & Longseller desk. Edited and checked on 2026-06-28, 08:47. Details in the imprint.

The Series 6 Plus bifacial module from First Solar Inc. sits in long rows on dusty ground, its glass surfaces catching pale morning light from both sky and soil. Walk between the trackers and you hear the quiet whirr of motors nudging the modules toward the sun.

What the module delivers

The Series 6 Plus bifacial module is built around First Solar's cadmium telluride thin-film technology, tuned for utility-scale power plants that chase every kilowatt-hour. It offers nameplate power ratings in the 430 W to 520 W range, depending on configuration and site conditions.First Solar module technology overview

Because it is bifacial, the module captures light on both the front and rear sides, harvesting albedo from bright ground surfaces. In practice, engineers at a 100 MW project in Gujarat describe rear-side gains that feel like a quiet bonus in the SCADA data on clear, dry days.

Designed for big solar fields

Product manager Chris Bueter, who helps shape the Series 6 roadmap, stresses that the Plus bifacial variant is meant for sites with single-axis trackers, wide spacing and careful ground treatment. The module is sized for high DC-to-AC ratios, allowing developers to push inverter loading close to their comfort limits.First Solar Series 6 data sheets

Compared with older Series 4 panels, the larger form factor cuts the number of modules per megawatt and simplifies wiring. EPC contractors who work with First Solar say the consistent frameless design and factory pre-sorting make string design more predictable on crowded layouts.

Thin-film advantages and trade-offs

First Solar spends a lot of time explaining why cadmium telluride modules behave differently from crystalline silicon panels in real weather. CEO Mark Widmar often highlights the technology's strong performance at high temperatures, where conventional panels lose more output per degree Celsius.First Solar technology roadmap announcement

For a project engineer walking a desert site in Arizona, the difference is tangible on the laptop screen. In afternoon heat with module temperatures above 60 °C, DC output from Series 6 strings sags less than silicon benchmarks, which helps peak-hour yield stay closer to the P50 model.

How it fits into projects

Utility developers choose the Series 6 Plus bifacial module not just for the wattage on the data sheet, but for how it meshes with contracts and grids. The modules are factory-binned for better energy modeling and come with warranties that align with 30-year asset horizons many funds now require.

On site, the frameless glass-glass construction demands careful handling but rewards crews with lower soiling and less risk of frame corrosion. One construction manager in Texas mentions the feel of the module edges as "clean and surprisingly smooth" when workers slide them into place on tracker rails.

Where it is sold and priced

The Series 6 Plus bifacial module is primarily sold business-to-business for utility-scale projects in the United States, India and the Middle East. Pricing is negotiated per project and typically tied to multi-year supply agreements that cover several gigawatts of capacity and staggered deliveries.

Because this is a B2B product, there is no retail RRP. Instead, module prices sit inside broader EPC budgets, with developers comparing bids from First Solar and silicon rivals on a levelized cost of electricity basis rather than a simple dollar-per-watt list price.

Company context and the shares

First Solar positions the Series 6 Plus bifacial module as part of a broader expansion plan, adding new factories in the United States and India to raise thin-film output. This keeps its pipeline filled with long-term offtake contracts for utility-scale parks.

First Solar Inc. shares (ISIN US3364331070) trade on NASDAQ in US dollars, with the company widely followed by analysts who track both module technology progress and its project order book.

This article was AI-assisted and editorially reviewed. Product information without guarantee; prices and availability may change at short notice. No investment advice, no buy or sell recommendation. Stock-market transactions involve risks up to total loss.

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