Off-Grid Rooftop Installation With Integrated Metal-Wrap-Through Solar Panels


  • Chinese solar module manufacturer Jiangsu Sunport Power Corp Ltd has provided its metal-wrap-through (MWT) modules for an off-grid rooftop PV project in the Nagano prefecture, in the central Chūbu region of Japan.

“The standalone system is connected to storage systems with a combined capacity of 159 kWh, provided by Sungrow, and is equipped with Sunport’s S1 flexible module NH1S,” a company spokesperson told pv magazine, noting that the PV system is not entitled to a feed-in tariff under Japan’s renewable energy incentive scheme and is being subsidized through a regional support scheme of the Nagano prefecture.

The PV system is intended for 100% self-consumption and is powering a factory of an undisclosed manufacturer. “The manufacturing facility had a colored steel tile roof and, in order to ensure the waterproofing, we could not use a mounting system,” the company spokesperson further explained. “Considering the low load bearing [nature of the system], the customer decided to use our light and flexible module.”

The manufacturer used its S1 MWT monocrystalline PERC Flexible Module. This product is available in four versions with power ratings ranging from 75 W to 90 W and a power conversion efficiency between 14.3% and 17.1%.

The frameless module has a size of 1,810x290x1.4mm and a weight of 1.3kg. It is manufactured with 30 half-cells, sized at 162.75mm, a white backsheet, and a POE encapsulant. Its connector is MC4-compatible and its junction box has an IP 68 rating.

The panel can be used in PV systems with a maximum voltage of 1,500 V. The manufacturer offers a 25-year power output guarantee for 82.36% of the initial yield, and a 12-year product guarantee. The module’s temperature coefficient is -0.36% per degree Celsius.

“The S1 panels supplied, were in a long and narrow shape which can be inlaid in corrugated steel tile with back glue and this not only saved support cost but also made the installation more stable and reliable,” the manufacturer said in a statement. “And based on metal-wrap-through (MWT) technology, no bus-bar and welding strip exists on the front side of the panels.”

In September 2017, Nanjing Sunport Power Corp Ltd announced the opening of its first, 1 GW solar module manufacturing facility in China, following a significant investment in Dutch equipment manufacturer Eurotron’s complete back contact solar module manufacturing line in 2013.

The Chinese manufacturer focuses purely on metal-wrap-through (MWT) module technology, working with both multi and mono products.

Author: Emiliano Bellini

This article was originally published in pv magazine and is republished with permission.

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