[PV Panel Quality] Mitsubishi Electric's Focus on Weather Resistance

Reason for using 4 lines in a cell

2014/08/30 14:23
Kenji Kaneko, Nikkei BP CleanTech Institute
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Shobara Solar Power Plant in Shobara City, Hiroshima Prefecture, has an output of 2MW while SoftBank Nagasaki Koyagi Solar Park (Fig. 1) in Koyagimachi, Nagasaki Prefecture, features 2.6MW output. The two mega (large-scale) solar power plants have something in common. Both of them incorporate monocrystalline silicon solar panels manufactured by Mitsubishi Electric Corp and PV inverters manufactured by Toshiba Mitsubishi-Electric Industrial Systems Corp (TMEIC).

Shobara City is in the Chugoku Mountains. The temperature can vary greatly there and sometimes drops below zero in winter. The area has plenty of snow, and snowfalls of more than 1m were observed in the past. Meanwhile, Koyagimachi is located along an inlet of the Nagasaki Peninsula, and SoftBank Nagasaki Koyagi Solar Park is located along the sea coast. The two solar power facilities are in areas with severe environmental conditions. The facility in Shobara City is subjected to large changes in temperature and snowfalls while the facility in Koyagimachi is subjected to salt wind that causes corrosion.

All models feature high weather resistance

The power producers selected the combination of the panels manufactured by Mitsubishi Electric and the PV inverter manufactured by TMEIC from among multiple proposals. One of the reasons for selecting the combination is "high reliability attributable to resistance to severe weather conditions." The power producers may have selected the manufacturers partly because of a sense of safety arising from the fact that they are a major heavy electric machinery manufacturer and a group company of the manufacturer. But the power producers also placed priority on the product designs that ensure reliability under severe environmental conditions.

The main body of the PV inverter manufactured by TMEIC is installed in a building equipped with an air conditioner for temperature/humidity control. Meanwhile, the solar panels are constantly exposed to severe natural environments.

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