Grid connected power generation system

光伏并網系統由組件支架并網逆變器并網柜組成，太陽能電池板發出的直流電，經逆變器轉換成交流電送入電網。目前主要有有大型地面電站中型工商業電站和小型家用電站三種形式。

The photovoltaic grid connected system consists of component brackets, grid connected inverters, and grid connected cabinets. The direct current generated by the solar panels is converted into alternating current by the inverters and sent to the power grid. At present, there are mainly three forms: large ground power stations, medium-sized industrial and commercial power stations, and small household power stations.

由于并網光伏發電系統不需要使用蓄電池，節省了成本。發布的并網新政策已經明確表示，家庭光伏電站可以免費入網，多余的電還可以賣給電力公司。從投資的長遠角度，按家庭光伏電站25年的使用壽命計算，6-10年左右可以回收成本，剩下的十幾年就是賺到的。

Due to the fact that grid connected photovoltaic power generation systems do not require the use of batteries, costs are saved. The new grid connection policy released by the country has clearly stated that home photovoltaic power stations can be connected to the grid for free, and excess electricity can be sold to power companies. From the long-term perspective of investment, based on the 25 year service life of a household photovoltaic power plant, costs can be recovered in around 6-10 years, and the remaining ten years are earned.

但是，并網也有其缺點，就是當公共電網斷電時，光伏發電也不能運行。但是如果把其中的并網逆變器換成儲能逆變器，電站就可以正常運轉。

However, grid connection also has its drawbacks, that is, when the public grid loses power, photovoltaic power generation cannot operate. But if the grid connected inverter is replaced with an energy storage inverter, the power plant can operate normally.

離網發電系統

Off grid power generation system

離網型光伏發電系統，不依賴電網而獨立運行，廣泛應用于偏僻山區無電區海島通訊基站和路燈等應用場所。系統一般由太陽電池組件組成的光伏方陣太陽能控制器，逆變器蓄電池組負載等構成。光伏方陣在有光照的情況下將太陽能轉換為電能，通過太陽能控制逆變一體機給負載供電，同時給蓄電池組充電；在無光照時，由蓄電池通過逆變器給交流負載供電。

Off grid photovoltaic power generation systems operate independently of the power grid and are widely used in remote mountainous areas, such as island communication base stations and street lights. The system generally consists of a photovoltaic array solar controller composed of solar cell components, an inverter battery pack load, etc. The photovoltaic array converts solar energy into electrical energy under illumination, and supplies power to the load through the solar controlled inverter integrated machine, while charging the battery pack; When there is no light, the battery supplies power to the AC load through the inverter.

這種系統由于必須配備蓄電池，且占據了發電系統30－50%的成本。而且鉛酸蓄電池的使用壽命一般都在3－5年，過后又得更換，這更是增加了使用成本。而經濟性來說，很難得到大范圍的推廣使用，因此不適合用電方便的地方使用。

This system requires batteries and accounts for 30-50% of the cost of the power generation system. Moreover, the service life of lead-acid batteries is generally 3-5 years, and they have to be replaced later, which further increases the cost of use. Economically speaking, it is difficult to promote and use it on a large scale, so it is not suitable for use in places where electricity is convenient.

對于無電網地區或經常停電地區家庭來說，離網系統具有很強的實用性。特別是單純為了解決停電時的照明問題，可以采用直流節能燈，非常實用。因此，離網發電系統是專門針對無電網地區或經常停電地區場所使用的。

For households in areas without power grids or areas with frequent power outages, off grid systems have strong practicality. Especially to solve the lighting problem during power outages, DC energy-saving lamps can be used, which is very practical. Therefore, off grid power generation systems are specifically designed for use in areas without power grids or areas with frequent power outages.