[Shipping Starts in May] Peace of Mind with Domestic Production! Eneco, with its direct sourcing route, fully introduces high-quality Choshu Sangyo solar panels, handled only by select installers.

Eneco Inc. (Headquarters: Shibuya-ku, Tokyo; CEO: Yoshiuma Sawada; hereinafter 'our company'), which provides one-stop services across energy, construction, and real estate, will begin full-scale handling of solar panels and storage battery systems from Choshu Sangyo Co., Ltd. (hereinafter 'Choshu Sangyo'), renowned for their high quality and reliability due to domestic production, starting from May 2026.

Why Eneco Actively Adopts 'Choshu Sangyo', a Brand Handled by Only a Limited Number of Companies!

A solar power system is an important home facility that continues to operate on your roof for 10 to 20 years. That is why, to provide our customers with a choice they will 'absolutely not regret,' our company (Eneco Inc.) has newly added products from Choshu Sangyo, a manufacturer boasting top-class reliability in Japan, to our main lineup.

① Choshu Sangyo's 'Complete Domestic Production' and Rigorous Quality Inspections

Choshu Sangyo is a 'purely domestic manufacturer' that insists on in-house development and production at its head office factory in Yamaguchi Prefecture. On the manufacturing line, a double-check system by machines and skilled staff maintains extremely high quality.

In Choshu Sangyo's proprietary tests, which assume Japan's harsh climate, their products clear standards that far exceed standard regulations.

・High Temperature and High Humidity Test: Cleared '4,000 hours,' four times the standard (1,000 hours).

・Temperature Cycle Test: Cleared '600 cycles,' three times the standard.

・Load-Bearing Test: Conducted using a weight 1.5 times the design load. This enables overwhelming durability and long-term stable power generation.

② Latest Technology to Minimize Power Generation Loss and Adaptability to Japanese Roofs

Choshu Sangyo's modules adopt the next-generation 'N-type TOPCon cells,' which suppress the decline in power generation output even during high summer temperatures. Furthermore, the following latest structures enhance safety and efficiency.

・16 Busbars: Smooth the path of electrons and reduce loss.

・Half-Cut Cell Structure: Reduces internal resistance and suppresses temperature rise due to shading.

In addition, to avoid wasting space on complex roof shapes common in Japanese houses (such as hip roofs), they offer a variety of 'half modules' and 'trapezoidal modules' in addition to standard ones. The ability to fit beautifully and without gaps on any roof is a unique strength of Choshu Sangyo as a domestic manufacturer. Their design allows for flexible adaptation to Japanese-specific hip roofs and complex-shaped houses, which is difficult for overseas manufacturers, making it easy to maximize power generation even in limited roof areas.

The great feature of Choshu Sangyo products is not giving up because 'it can't be installed,' but being able to design 'how to install it.' Generally, when the surface temperature of solar panels rises above 70°C under direct summer sunlight, a 'temperature loss' occurs, reducing power generation efficiency. However, Choshu Sangyo's N-type TOPCon cells have the characteristic of suppressing output decline at high temperatures, and a major strength is their ability to secure 'actual power generation in real-life environments,' not just the numbers on a catalog. Their design allows for flexible adaptation to Japanese-specific hip roofs and complex-shaped houses, which is difficult for overseas manufacturers, making it easy to maximize power generation even in limited roof areas. The great feature of Choshu Sangyo products is not giving up because 'it can't be installed,' but being able to design 'how to install it.'

③ Industry-Leading '30-Year Output Warranty' and Reassuring 'Leakage Warranty'

The manufacturer's confidence is reflected in its generous warranty system. A solar power system is a home facility intended for long-term operation of 20 or 30 years, not just 10. That's why our company emphasizes not just 'low initial cost,' but 'whether it can be used with peace of mind for a long time.'

・Hybrid Linear Output Warranty: Guarantees a fixed 90% output from the 26th year onwards (30-year module output warranty).

・10-Year Workmanship Warranty (including leakage): A standard warranty against water leakage from the installation points, which is rare in the industry. Choshu Sangyo's unique '3-stage strict waterproofing process (sealing, screws with gaskets, and butyl sheets)' thoroughly prevents water intrusion.

④ Our Company's (Eneco's) Unique Strengths: Rare 'Direct Sourcing from Manufacturer' and 'Reliable Technology'

This is the biggest advantage of choosing Eneco Inc.

・Cost Merit by Cutting Intermediary Margins: The handling of Choshu Sangyo's products is strictly limited to certain companies. Our company has established a direct sourcing route from Choshu Sangyo, and very few companies in the industry have this route. Because it is 'direct sourcing' without going through trading companies, we can provide high-quality products at a fair price that satisfies our customers.

It is not a simple 'price competition,' but the fact that we are chosen for 'total cost performance' including 'the peace of mind of domestic production,' 'long-term warranty,' and 'installation quality' is a characteristic of Eneco.