问题是热能转化系统需要更高的温度，而太阳能电池的效率在高温下迅速降低。

The problem has been that high temperatures are necessary to power heat-based conversion systems, yet solar cell efficiency rapidly decreases at higher temperatures.

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第39届国际物理奥林匹克竞赛实验试题是：利用差示温度计法来测定固态晶体物质的凝固点和测定太阳能电池的效率。

This paper introduces the 39th IPhO experiment test, which using the differential thermometer to measure the solidifying point of a crystalline solid substance and an efficiency of the solar cell.

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蓄电池充电器采用三段式充电模式并具温度补偿功能，广泛应用于发电机组启动电池、太阳能电池等；

Battery charger used three segment type charging mode and with temperature compensation function, widely apply in generator group started battery, solar cells etc.

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