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　　日本(ben)業界宣稱，為了(le)有效利(li)用太陽能發電(dian)將在日本(ben)國內推廣應用直流(liu)供電(dian)系(xi)統，最終目的是更有利(li)于（），使太陽能發電(dian)成本(ben)更低。

　　太陽(yang)能(neng)(neng)(neng)發(fa)(fa)電(dian)(dian)(dian)在(zai)日(ri)本(ben)已日(ri)趨普(pu)及，但隨(sui)著(zhu)太陽(yang)能(neng)(neng)(neng)電(dian)(dian)(dian)池的發(fa)(fa)電(dian)(dian)(dian)量(liang)(liang)迅速增加會引(yin)發(fa)(fa)一(yi)個大(da)問題。在(zai)日(ri)本(ben)，太陽(yang)能(neng)(neng)(neng)電(dian)(dian)(dian)池的發(fa)(fa)電(dian)(dian)(dian)量(liang)(liang)一(yi)旦超過1000萬千瓦，如果傳(chuan)送到電(dian)(dian)(dian)網上(shang)將導致電(dian)(dian)(dian)力系統不(bu)穩定。為(wei)了解決這一(yi)問題，業界認為(wei)，在(zai)各(ge)家庭設置由太陽(yang)能(neng)(neng)(neng)電(dian)(dian)(dian)池和蓄電(dian)(dian)(dian)裝置組成的系統，將太陽(yang)能(neng)(neng)(neng)電(dian)(dian)(dian)池發(fa)(fa)的電(dian)(dian)(dian)先儲存在(zai)蓄電(dian)(dian)(dian)池中(zhong)以穩定電(dian)(dian)(dian)網運行的做(zuo)法更經濟可行。

　　如果沿用原有的(de)(de)太陽(yang)能(neng)發電(dian)(dian)(dian)系統(tong)，要將太陽(yang)能(neng)電(dian)(dian)(dian)池的(de)(de)電(dian)(dian)(dian)力進(jin)行4次以上的(de)(de)交(jiao)直流(liu)轉(zhuan)(zhuan)(zhuan)換，轉(zhuan)(zhuan)(zhuan)換損(sun)失(shi)非常大(da)，而如果在住(zhu)宅內直接(jie)進(jin)行直流(liu)供電(dian)(dian)(dian)，則能(neng)夠大(da)幅削減轉(zhuan)(zhuan)(zhuan)換損(sun)失(shi)。

　　目前，這(zhe)(zhe)種(zhong)能(neng)(neng)使耗電(dian)量削減(jian)10～20%的(de)直流供(gong)電(dian)系統已開(kai)(kai)始推(tui)廣，包括向辦公(gong)室、工廠、店鋪(pu)及(ji)(ji)家庭(ting)(ting)(ting)等領域滲透。其中，直流供(gong)電(dian)系統在(zai)家庭(ting)(ting)(ting)中普及(ji)(ji)的(de)關鍵是太陽能(neng)(neng)電(dian)池(chi)。日本(ben)(ben)從2009年(nian)度恢復了針對(dui)家用(yong)太陽能(neng)(neng)電(dian)池(chi)的(de)補(bu)貼制度。日本(ben)(ben)經(jing)濟產業(ye)省預測，2020年(nian)將達到2800萬(wan)(wan)千瓦，安(an)裝在(zai)約530萬(wan)(wan)戶(hu)(hu)住宅(zhai)中，2030年(nian)增至5300萬(wan)(wan)千瓦，惠及(ji)(ji)約1000萬(wan)(wan)戶(hu)(hu)住宅(zhai)中。按照(zhao)計劃，到2030年(nian)日本(ben)(ben)家庭(ting)(ting)(ting)利用(yong)太陽能(neng)(neng)發電(dian)可能(neng)(neng)超過5300萬(wan)(wan)千瓦。為了讓推(tui)廣家庭(ting)(ting)(ting)實現(xian)自我供(gong)電(dian)，日本(ben)(ben)正在(zai)研制更多的(de)家庭(ting)(ting)(ting)供(gong)電(dian)裝置，包括利用(yong)家庭(ting)(ting)(ting)廢水(shui)和雨水(shui)槽中雨水(shui)發電(dian)的(de)超小(xiao)型(xing)水(shui)輪機發電(dian)，甚至開(kai)(kai)發可利用(yong)自行(xing)車型(xing)健(jian)身(shen)器材(cai)、跑步機等進(jin)行(xing)發電(dian)的(de)發電(dian)機。然后利用(yong)鋰離(li)子充電(dian)電(dian)池(chi)將家庭(ting)(ting)(ting)中的(de)這(zhe)(zhe)些微弱發電(dian)以直流皮方式儲存(cun)起來，每天能(neng)(neng)夠蓄電(dian)約1千瓦小(xiao)時左右。

　　為了實現(xian)家庭(ting)自我供(gong)電(dian)(dian)(dian)，目(mu)前日(ri)本許多廠商開(kai)始著手開(kai)發在(zai)實際(ji)家庭(ting)中能夠使(shi)用的(de)直(zhi)流(liu)供(gong)電(dian)(dian)(dian)系(xi)統(tong)。松下電(dian)(dian)(dian)工計劃將太(tai)陽光發電(dian)(dian)(dian)及燃料電(dian)(dian)(dian)池(chi)等(deng)直(zhi)流(liu)發電(dian)(dian)(dian)系(xi)統(tong)和直(zhi)流(liu)充(chong)放電(dian)(dian)(dian)的(de)蓄電(dian)(dian)(dian)池(chi)設(she)置在(zai)住宅中。作(zuo)為鼓勵(li)政策，日(ri)本政府(fu)從(cong)2011年11月1日(ri)起推(tui)行家庭(ting)、學校等(deng)安裝的(de)太(tai)陽能設(she)備發電(dian)(dian)(dian)剩余(yu)電(dian)(dian)(dian)力(li)收購(gou)新制度，電(dian)(dian)(dian)力(li)公司以每千(qian)瓦時(shi)48日(ri)元的(de)價格(ge)購(gou)買剩余(yu)電(dian)(dian)(dian)力(li)，新價格(ge)是原先(xian)的(de)2倍。