100w led solar floodlights little knowledge:

How to reduce the cost of materials and wafers

The price of residential solar power generation system in 2007 (46 yen kW plus. The engineering cost is half here, and the battery module cost is 20 yen (Wh). NEDO sets the standard to reach 14 yen in 2020 (W-h) ), the price must be reduced to 13 yen. Therefore, the battery module cost must reach 13 yen in 2020, that is, the price of 7 yen / kWh. For crystalline silicon solar cells, the cost of the chip accounts for the total component. More than half of the cost. The cost of materials is reduced by solar polysilicon, but the thickness of the wafer must now be considered. To achieve this, an important issue is how to reduce wafer cutting losses.