After leaving BYD, they built the world's fifth-ranked energy storage company—one that started out relying on "compatibility." What's their secret?

Qin Datang Digital Energy, established less than nine years ago, has submitted its Hong Kong Stock Exchange listing application, yet its business model harbors hidden risks.

Insight Energy observes that this system integrator, with neither self-produced cell capacity nor inverter proprietary access, has taken root in the gaps of the European residential energy storage market by leveraging its unique edge of "multi-brand inverter compatibility".

It is understood that Qin Datang Digital Energy began submitting listing documents to the Hong Kong Stock Exchange on June 26, 2026. Half a month later, China International Capital Corporation (CICC) and Citigroup joined the list of global coordinators. According to the prospectus, measured by 2025 shipment volume, this company, established less than nine years ago, has become the world's fifth-largest residential energy storage system provider, with shipments reaching 2.5 GWh and a market share of 6.5%.

However, Insight Energy believes that its rise precisely exposes a cruel, increasingly verified logic in the energy storage industry: as Huawei, Sungrow, and Goodwe move to complete their full energy storage product lines, the ecological niche that once belonged purely to system integrators is rapidly narrowing.

Seizing the market with "compatibility" during the window before inverter giants woke up to the opportunity

The rise of Qin Datang Digital Energy is essentially a precise timing arbitrage play.

Back in 2017, when the company was founded, the European residential energy storage market was still in its infancy. At that time, major inverter giants such as Huawei and Sungrow had not yet prioritized energy storage batteries as a strategic focus, and the market lacked standardized battery products.

The harsh reality facing installers was: There were numerous inverter brands, but almost no battery solutions that could work across multiple brands.

Qin Datang Digital Energy seized on this exact gap. Its core product logic is straightforward: the BMS built-in communication protocol is compatible with over 90% of mainstream inverter brands, and can automatically match their communication protocols. For installers, this means no more need to pair different batteries for different inverters — one single solution works for all. Combined with local warehouse distribution, flexible supply, and on-site support from local engineers, this "installer-friendly" strategy quickly gained traction across Europe.

Underpinning this strategy is a sales team whose core members all came from BYD. Chairman Liu Yang spent 18 years at BYD, rising to the position of Sales Director in the Photovoltaic Division. Executive Director Tong Jiancheng, Deputy General Manager Lei Chunbo, and Finance Director Zhao Ranzhi all have the same BYD background.

What this team excels at most is not cell R&D, but getting products sold into overseas markets. From the very beginning, Qin Datang Digital Energy set its battlefield abroad: in 2025, 95.1% of its revenue came from outside mainland China, with the single European market contributing 61% of total revenue.

In terms of product strategy, it followed a path of "entry via low-voltage batteries, modular design, and high cost-effectiveness". In its early days, it cleverly avoided head-on competition with leading brands in the high-voltage market, rapidly expanding distribution with standardized products. Its sales channels rely almost entirely on distributors: it is reported that distributor sales accounted for 98.2% of its total revenue in 2025.

This asset-light strategy allowed it to achieve the fastest growth with the minimum investment.

Capital markets also fueled its momentum. From a Series A valuation of 380 million yuan in 2022 to a Pre-IPO valuation of 5.835 billion yuan in 2026, its valuation surged 15 times in over three years. Industrial capital players including Ginlong Technologies, Dongshan Precision, and PRET have successively invested in the company. CICC and Citigroup also joined as lead coordinators immediately after the listing application was submitted.

The market consensus is clear: this company caught the industry upswing and achieved significant scale.

Qin Datang Digital Energy, harshly schooled by market cycles

Yet rapid growth cannot mask underlying fragility.

In 2022, when lithium carbonate prices hit a historic high of 500,000 yuan per ton, Qin Datang Digital Energy purchased a large volume of cells and produced 284,000 residential energy storage batteries. Shortly after, lithium carbonate prices plummeted by 80%, and the European market abruptly shifted from supply scarcity to oversaturation.

This batch of batteries purchased at peak prices became a heavy burden. In 2023, the company offloaded 114,000 units and recorded 47 million yuan in impairment losses. In 2024, it sold off another 108,000 units, booking a gross loss of 130 million yuan and an additional 81.4 million yuan in impairment write-downs. Total losses related to old inventory amounted to approximately 292 million yuan.

The 2025 return to profitability requires a nuanced breakdown.

A 244% surge in revenue did bring significant scale effects: commercial and industrial energy storage revenue reached 603 million yuan, and its 33.2% gross margin delivered genuine operating profits.

However, there were two "non-recurring" income items: 10.037 million yuan of reversed impairment from inventory clearance, and roughly 59.3 million yuan in exchange gains from the appreciation of the euro. Excluding exchange gains, the company's actual 2025 net profit was around 66 million yuan, with a net margin of less than 3%.

More alarming are the structural risks in its business model. Distributor sales accounting for 98.2% of revenue means the company has essentially handed over control of its lifeline to third-party channels.

Worse still, the distributor network is far from stable. During the same period, it terminated partnerships with 107, 141, and 278 distributors respectively across different periods. Unlike other sectors, residential energy storage follows a rule: the closer you get to end customers, the stronger your bargaining power, leaving brand manufacturers inherently with weak negotiating leverage.

R&D investment is also falling behind. In 2025, its R&D expense ratio was only 4.1%, significantly lower than industry peers such as Afore Energy, which posted a 14.89% R&D ratio.

In other words, while competitors are building technical moats, Qin Datang Digital Energy is still scaling up its sales team.

Industry warning: Inverter giants are reclaiming the "ecological niche"

Qin Datang Digital Energy's rise was built on the ecological gap left by leading inverter manufacturers before they completed their full-stack "inverter + energy storage" layout.

What it achieved was not a technological breakthrough, but "niche arbitrage": before Huawei, Sungrow, and Goodwe made energy storage batteries a standard part of their offerings, it preemptively occupied shelf space with installers.

But this window is closing fast.

Once inverter manufacturers integrate energy storage batteries into their product lines, installer decision-making shifts: original factory full-system warranties, deeply integrated protocol compatibility, and full-channel rebates are all advantages that third-party battery suppliers cannot match.

For Qin Datang Digital Energy, "multi-brand compatibility" was once a core competitive weapon. But now that every major inverter brand is launching its own proprietary battery solutions, "compatibility" no longer counts as a differentiator — it becomes an awkward status of having no proprietary inverter platform to rely on.

The industry is entering an era where "platform ownership is king". Whoever controls the inverter controls the entry point of the energy storage system. Qin Datang Digital Energy does not own this entry point. It does not produce cells or inverters; its business revolves purely around an "adaptation layer".

As both upstream and downstream players pursue vertical integration, the value of this intermediate layer will continue to shrink.

What industry practitioners should make of this case

Qin Datang Digital Energy's IPO offers a valuable observation window for energy storage industry practitioners.

First, recognize the shifting stage of the industry track.

The residential energy storage sector has moved past the "who can grow fastest" phase and entered an era of "who can stand firm". In the early days, sales-driven and channel-driven strategies could deliver rapid scale, but future competition will hinge on technical moats and full industrial chain depth. Qin Datang Digital Energy's 2025 R&D expense ratio of 4.1% will face intense scrutiny during the IPO review process.

Second, be alert to the time-limited nature of any "ecological niche".

The energy storage industry is undergoing rapid vertical integration: inverter manufacturers are making batteries, battery factories are developing full systems, and system integrators are building their own brands — every player is extending their reach up and down the value chain. If you only operate in a single intermediate layer without irreplaceable technology or exclusive resources, you could easily be squeezed out of the market at any time.

Third, expanding overseas is not a universal panacea.

Qin Datang Digital Energy derives 95% of its revenue from overseas markets, with 61% coming from Europe alone. But many European countries are already cutting photovoltaic subsidies, and the Netherlands is set to abolish its solar net metering policy in 2027. The risks of over-reliance on a single market are accumulating. Distributors and installers who followed Qin Datang Digital Energy's overseas expansion need to ask themselves: when inverter giants roll out their own battery lines, when subsidies are phased out, and price wars spill into the European market, how much of your profit margin will remain?

A group of sales talent who left BYD built Qin Datang Digital Energy and took it to the world's fifth-largest position in less than nine years. That achievement deserves respect. But capital markets never judge a company solely by its industry ranking.

When a company generates 98% of its revenue from distributors, lags significantly in R&D investment, and earns half its net profit from exchange rate fluctuations, the glamour of being the world's fifth-largest player cannot possibly cover up all the fragility in its business model.

Insight Energy believes that the wild, unregulated growth phase of the energy storage industry is coming to an end, and the era of competing with real, tangible capabilities is just beginning.