ENPH vs FSLR: How Enphase Energy and First Solar Compare (2026)

Same yardstick, side by side (as of July 2026). Valuation lined up like this is most meaningful for two names in the same corner of the market, which these are. Figures are approximate; verify before investing.

Reading it: FSLR is the cheaper of the two on forward earnings, but cheaper is not the same as better. Pair the valuation with growth (how far the forward P/E sits below the trailing P/E) and risk (beta) before you decide.

The metrics above tell you which is the marginally better business. The bigger risk for most people is not picking the slightly worse stock, it is over-concentrating. ENPH and FSLR share themes, so owning both, or adding either to what you already hold, can quietly push a large share of your portfolio into one bet.

This is the part a generic comparison page cannot answer, because it depends on what you own. Connect your brokerage and Walnut shows your real, combined ENPH and FSLR exposure, flags overlap with your existing positions, and tells you if adding one would tip you past a concentration you are comfortable with, read-only by default, with your login staying at your broker. Walnut is not an investment adviser.

Enphase Energy is a leading provider of solar microinverters and home-energy systems. Its core product is the microinverter, a small device attached to each individual solar panel that converts the panel's direct current into the alternating current used in homes and on the grid. This panel-level approach differs from traditional string inverters that handle many panels at once, offering advantages in reliability, safety, monitoring, and performance when panels are shaded or fail. Enphase has expanded from microinverters into a broader home-energy platform, including its IQ Battery storage systems, EV chargers, and software that lets homeowners monitor and manage solar production, battery storage, and consumption through an app. The company sells primarily to installers and distributors who deploy its products in residential rooftop solar projects, mostly in the United States and Europe. Enphase earns revenue from hardware sales of microinverters and batteries, with a growing contribution from storage and software. It is headquartered in Fremont, California, and has been one of the most recognizable names in residential solar technology.

Full ENPH guide

First Solar is one of the largest solar panel manufacturers in the United States and the leading maker of thin-film solar modules. Unlike most competitors that use crystalline silicon, First Solar uses a cadmium telluride (CdTe) thin-film technology that it developed and manufactures at scale. This gives it a differentiated cost structure, strong performance in hot and humid climates, and a supply chain largely independent of the Chinese silicon ecosystem. The company sells utility-scale solar modules primarily to large developers and power producers building solar farms, mainly in the US, India, and other markets. First Solar makes money by manufacturing and selling these modules, and its US-based production qualifies for domestic manufacturing incentives. Headquartered in Tempe, Arizona, First Solar has expanded capacity aggressively across Ohio, Alabama, Louisiana, and India. It benefits from policy support for domestic clean energy manufacturing and from buyers seeking non-Chinese solar supply.

Full FSLR guide

Both fit overlapping themes, but they are not interchangeable. The useful comparison is which set of drivers and risks you want exposure to.

• ENPH drivers: Microinverter leadership; Battery storage expansion.
• FSLR drivers: Domestic manufacturing incentives; Differentiated thin-film technology.

A faster-growing, richer-valued name usually swings harder, so it suits a longer horizon and a higher tolerance for volatility; a steadier, more cash-generative business suits a more conservative or income-minded investor. The honest test is which set of risks you could hold through a drawdown: Enphase's business is highly sensitive to interest rates, since most residential solar is financed; higher rates raise monthly costs and depress demand, as recent demand weakness showed. For FSLR, first Solar's fortunes are closely tied to policy, particularly US clean energy manufacturing incentives, which could change with political shifts.

Growth-minded investors who believe the theme has years to run tend to accept the richer multiple for more upside; value-minded investors lean toward the cheaper forward earnings and steadier profile. Pick ENPH if you believe its drivers more; FSLR if you believe its. Many investors hold both, but since they share themes, that is a concentrated bet, not diversification. Decide deliberately and check overlap. For the full detail, see the ENPH and FSLR guides.

ENPH. Enphase is a growth-and-cycle solar stock whose valuation swings sharply with interest rates, solar demand, and policy. The market values it on long-term residential-solar and storage growth and high gross margins, but earnings and the multiple are highly cyclical. It has traded at premium valuations in upcycles and compressed materially during demand downturns.

FSLR. First Solar is valued as a profitable, policy-advantaged solar manufacturer with substantial contracted backlog. Investors weigh strong current margins and incentive support against the cyclicality and pricing pressure of the broader solar industry. The valuation reflects both the durability of its domestic manufacturing position and sensitivity to policy and trade developments.

Headline figures (approximate, early 2026): ENPH shows revenue (ttm) ~$1.3-1.5 billion, recovering from a downturn, gross margin ~40%+, supported by US manufacturing credits, operating margin Recovering, historically strong in upcycles, revenue growth Cyclical, tied to rates and solar demand; FSLR shows revenue (ttm) ~$4 to 5 billion, operating margin ~high teens to mid-twenties percent, net income (ttm) ~$1 billion or more, contracted backlog ~tens of gigawatts, multi-year.

ENPH and FSLR are related but distinct: same themes, different businesses and risks. Neither wins in the abstract; the right pick is whichever thesis you actually believe, sized so you are not over-concentrated in one theme. Walnut can show your combined ENPH and FSLR exposure against your real portfolio. It is not an investment adviser.