逆變(bian)(bian)器就是一種將低壓(ya)(12或24伏或48伏)直流(liu)電(dian)(dian)轉變(bian)(bian)為(wei)220伏交流(liu)電(dian)(dian)的電(dian)(dian)子設(she)備(bei)。因為(wei)我(wo)們(men)通常是將220伏交流(liu)電(dian)(dian)整流(liu)變(bian)(bian)成直流(liu)電(dian)(dian)來(lai)使用，而逆變(bian)(bian)器的作用與此相反，因此而得名。我(wo)們(men)處在(zai)(zai)一個“移(yi)動(dong)(dong)”的時代，移(yi)動(dong)(dong)辦公(gong)，移(yi)動(dong)(dong)通訊，移(yi)動(dong)(dong)休(xiu)閑和(he)娛樂(le)。在(zai)(zai)移(yi)動(dong)(dong)的狀態中，人們(men)不但(dan)需要由電(dian)(dian)池或電(dian)(dian)瓶供給的低壓(ya)直流(liu)電(dian)(dian)，同時更(geng)需要我(wo)們(men)在(zai)(zai)日常環境中不可或缺的220伏交流(liu)電(dian)(dian)，逆變(bian)(bian)器就可以(yi)滿足我(wo)們(men)的這種需求(qiu)。

逆(ni)變(bian)(bian)器(qi)作(zuo)為光(guang)伏(fu)系(xi)統的(de)(de)(de)(de)心臟，對于太(tai)(tai)(tai)陽(yang)能離(li)網(wang)供電(dian)(dian)(dian)(dian)系(xi)統的(de)(de)(de)(de)運行起(qi)著重要的(de)(de)(de)(de)作(zuo)用(yong)，光(guang)伏(fu)發電(dian)(dian)(dian)(dian)逆(ni)變(bian)(bian)器(qi)選(xuan)型，光(guang)伏(fu)逆(ni)變(bian)(bian)器(qi)的(de)(de)(de)(de)作(zuo)用(yong)就是(shi)把(ba)太(tai)(tai)(tai)陽(yang)能電(dian)(dian)(dian)(dian)池板所(suo)發的(de)(de)(de)(de)直(zhi)流(liu)電(dian)(dian)(dian)(dian)轉化成家電(dian)(dian)(dian)(dian)使用(yong)的(de)(de)(de)(de)交流(liu)電(dian)(dian)(dian)(dian)。太(tai)(tai)(tai)陽(yang)能逆(ni)變(bian)(bian)器(qi)既環保(bao)又(you)清潔(jie)，畢(bi)竟(jing)，這是(shi)一(yi)種利用(yong)太(tai)(tai)(tai)陽(yang)能的(de)(de)(de)(de)產品(pin)，阜陽(yang)逆(ni)變(bian)(bian)器(qi)，對環境的(de)(de)(de)(de)污(wu)染自然很小。太(tai)(tai)(tai)陽(yang)能泵變(bian)(bian)頻(pin)器(qi)可以(yi)將太(tai)(tai)(tai)陽(yang)能模(mo)組產生的(de)(de)(de)(de)直(zhi)流(liu)電(dian)(dian)(dian)(dian)轉換為交流(liu)電(dian)(dian)(dian)(dian)去驅動(dong)沈水泵，不需要電(dian)(dian)(dian)(dian)池或是(shi)其他的(de)(de)(de)(de)能量(liang)儲存(cun)設備。

逆(ni)(ni)(ni)變(bian)(bian)(bian)器(qi)作為光伏(fu)發電(dian)(dian)(dian)系統內(nei)部重要的(de)(de)電(dian)(dian)(dian)氣設備，其設備本身所(suo)配備的(de)(de)各類保(bao)(bao)(bao)(bao)護(hu)(hu)(hu)(hu)功(gong)能較(jiao)為完善，光伏(fu)發電(dian)(dian)(dian)逆(ni)(ni)(ni)變(bian)(bian)(bian)器(qi)，具體(ti)有直流母線過(guo)電(dian)(dian)(dian)壓保(bao)(bao)(bao)(bao)護(hu)(hu)(hu)(hu)、交流過(guo)欠壓保(bao)(bao)(bao)(bao)護(hu)(hu)(hu)(hu)、交流頻率保(bao)(bao)(bao)(bao)護(hu)(hu)(hu)(hu)、極性反接保(bao)(bao)(bao)(bao)護(hu)(hu)(hu)(hu)、短路保(bao)(bao)(bao)(bao)護(hu)(hu)(hu)(hu)、孤(gu)島效應保(bao)(bao)(bao)(bao)護(hu)(hu)(hu)(hu)、過(guo)溫保(bao)(bao)(bao)(bao)護(hu)(hu)(hu)(hu)、直流過(guo)載(zai)保(bao)(bao)(bao)(bao)護(hu)(hu)(hu)(hu)等保(bao)(bao)(bao)(bao)護(hu)(hu)(hu)(hu)功(gong)能。許多獨立逆(ni)(ni)(ni)變(bian)(bian)(bian)器(qi)也整合了電(dian)(dian)(dian)池充電(dian)(dian)(dian)器(qi)，可以用交流電(dian)(dian)(dian)源為電(dian)(dian)(dian)池充電(dian)(dian)(dian)。一般這(zhe)種逆(ni)(ni)(ni)變(bian)(bian)(bian)器(qi)不會接觸到電(dian)(dian)(dian)網，因此也不需要孤(gu)島效應保(bao)(bao)(bao)(bao)護(hu)(hu)(hu)(hu)機能。很大功(gong)率點（MPPT）的(de)(de)技術來從太陽(yang)能板抽(chou)取大可能的(de)(de)功(gong)率。太陽(yang)能電(dian)(dian)(dian)池的(de)(de)太陽(yang)輻照(zhao)度、溫度及總電(dian)(dian)(dian)阻之間有復雜的(de)(de)關系，因此輸出效率會有非(fei)線性的(de)(de)變(bian)(bian)(bian)化，稱為電(dian)(dian)(dian)流-電(dian)(dian)(dian)壓曲(qu)線（I-Vcurve）。