逆(ni)變器(qi)為光伏(fu)(fu)系(xi)(xi)統的(de)(de)(de)一部(bu)分，又(you)被叫做電(dian)(dian)(dian)(dian)源調整器(qi)、功率調節器(qi)。太(tai)陽能(neng)(neng)(neng)并網(wang)(wang)(wang)逆(ni)變器(qi)是(shi)將(jiang)電(dian)(dian)(dian)(dian)能(neng)(neng)(neng)反饋到電(dian)(dian)(dian)(dian)網(wang)(wang)(wang)，若電(dian)(dian)(dian)(dian)網(wang)(wang)(wang)斷電(dian)(dian)(dian)(dian)時，光伏(fu)(fu)逆(ni)變器(qi)價(jia)格，需快速的(de)(de)(de)切斷供電(dian)(dian)(dian)(dian)給(gei)電(dian)(dian)(dian)(dian)網(wang)(wang)(wang)的(de)(de)(de)線路(lu)，太(tai)陽能(neng)(neng)(neng)光伏(fu)(fu)逆(ni)變器(qi)生產廠(chang)家，這是(shi)美國國家電(dian)(dian)(dian)(dian)氣規范（NEC）的(de)(de)(de)要求，以(yi)確保在斷電(dian)(dian)(dian)(dian)時，并網(wang)(wang)(wang)逆(ni)變器(qi)也(ye)會關(guan)閉，避免傷害(hai)維修電(dian)(dian)(dian)(dian)網(wang)(wang)(wang)的(de)(de)(de)人員。逆(ni)變器(qi)作為光伏(fu)(fu)系(xi)(xi)統的(de)(de)(de)心臟，對于(yu)太(tai)陽能(neng)(neng)(neng)離網(wang)(wang)(wang)供電(dian)(dian)(dian)(dian)系(xi)(xi)統的(de)(de)(de)運行起(qi)著重要的(de)(de)(de)作用(yong)，光伏(fu)(fu)逆(ni)變器(qi)的(de)(de)(de)作用(yong)就是(shi)把太(tai)陽能(neng)(neng)(neng)電(dian)(dian)(dian)(dian)池板(ban)所(suo)發的(de)(de)(de)直流電(dian)(dian)(dian)(dian)轉化成家電(dian)(dian)(dian)(dian)使用(yong)的(de)(de)(de)交流電(dian)(dian)(dian)(dian)。

目前市面上的(de)(de)(de)(de)(de)并網逆(ni)變(bian)器(qi)有使用許(xu)多不同的(de)(de)(de)(de)(de)技術，包括使用較(jiao)新的(de)(de)(de)(de)(de)高頻變(bian)壓器(qi)、傳(chuan)統的(de)(de)(de)(de)(de)工頻變(bian)壓器(qi)，或是無(wu)變(bian)壓器(qi)的(de)(de)(de)(de)(de)架構。大功率(lv)點的(de)(de)(de)(de)(de)目的(de)(de)(de)(de)(de)就是在各(ge)環(huan)境下，針(zhen)對太陽能(neng)模(mo)組(zu)的(de)(de)(de)(de)(de)輸出(chu)取(qu)様，產生一個（太陽能(neng)模(mo)組(zu)的(de)(de)(de)(de)(de)）負(fu)載電(dian)阻來獲得大的(de)(de)(de)(de)(de)功率(lv)。一般(ban)光伏(fu)逆(ni)變(bian)器(qi)產品都給出(chu)了當(dang)直流輸入(ru)電(dian)壓在允許(xu)波動(dong)(dong)范圍變(bian)動(dong)(dong)時(shi)，該光伏(fu)逆(ni)變(bian)器(qi)輸出(chu)電(dian)壓的(de)(de)(de)(de)(de)波動(dong)(dong)偏差的(de)(de)(de)(de)(de)百分率(lv)，銅陵光伏(fu)逆(ni)變(bian)器(qi)，通常稱為電(dian)壓調整率(lv)。

光伏逆變(bian)(bian)(bian)(bian)器應同時(shi)(shi)給(gei)出當負載(zai)由零向100%變(bian)(bian)(bian)(bian)化時(shi)(shi)，該(gai)光伏逆變(bian)(bian)(bian)(bian)器輸出電(dian)(dian)(dian)壓(ya)(ya)(ya)的偏(pian)差(cha)百(bai)分率，通常稱為(wei)(wei)負載(zai)調(diao)整(zheng)率。太陽能泵(beng)變(bian)(bian)(bian)(bian)頻(pin)器一般(ban)會有數個(ge)接口(kou)，光伏逆變(bian)(bian)(bian)(bian)器品牌，可(ke)以允許(xu)太陽能模組陣(zhen)列提供(gong)直(zhi)(zhi)流(liu)(liu)電(dian)(dian)(dian)流(liu)(liu)，會有一個(ge)接口(kou)輸出交(jiao)流(liu)(liu)電(dian)(dian)(dian)壓(ya)(ya)(ya)，也(ye)可(ke)能會有接水(shui)位(wei)感測器輸入的接口(kou)。以往(wang)對于無(wu)變(bian)(bian)(bian)(bian)壓(ya)(ya)(ya)器，又(you)要供(gong)電(dian)(dian)(dian)到電(dian)(dian)(dian)網的系統會有一些疑慮，主要是因(yin)為(wei)(wei)在直(zhi)(zhi)流(liu)(liu)電(dian)(dian)(dian)路和交(jiao)流(liu)(liu)電(dian)(dian)(dian)路之間沒(mei)有電(dian)(dian)(dian)隔離（galvanic isolation），若直(zhi)(zhi)流(liu)(liu)端(duan)故障，會有大電(dian)(dian)(dian)流(liu)(liu)流(liu)(liu)到交(jiao)流(liu)(liu)端(duan)。