UPS不間斷電源作為重要設備(bei)在斷(duan)電(dian)(dian)后的(de)(de)后備(bei)應急電(dian)(dian)源，能(neng)正確預估其(qi)市電(dian)(dian)斷(duan)電(dian)(dian)后給對應的(de)(de)設備(bei)供電(dian)(dian)的(de)(de)時間長短，是保障設備(bei)安全的(de)(de)重要措(cuo)施，那么(me)UPS不(bu)間斷(duan)電(dian)(dian)源后備(bei)續航(hang)時間的(de)(de)計算(suan)方式怎么(me)算(suan)呢？

(電池(chi)容量X電池(chi)工作電壓)/設備功率(lv)=可延長時間(jian)(小時)。

例(li)如:1000VA的UPS電(dian)源(yuan)內(nei)置(zhi)12V電(dian)池(chi)7AH二(er)只(zhi)，帶400W的設備。

計算方法(fa)：電池(chi)容量(liang)7AHX電池(chi)工(gong)作電壓(ya)24V/設備功率(lv)400W=0.42小時(shi)，換算成分鐘約(yue)為：0.42X60=25分鐘左(zuo)右。

UPS不間(jian)斷電(dian)(dian)(dian)源備(bei)用時間(jian)的(de)(de)(de)(de)長短是由(you)UPS的(de)(de)(de)(de)儲能裝置決定的(de)(de)(de)(de)，現在的(de)(de)(de)(de)UPS一般都用全密封(feng)的(de)(de)(de)(de)免維護(hu)鉛酸蓄(xu)電(dian)(dian)(dian)池(chi)(chi)作(zuo)為儲能裝置，電(dian)(dian)(dian)池(chi)(chi)容量的(de)(de)(de)(de)大(da)小(xiao)由(you)“安(an)(an)時數（AH）”這(zhe)個(ge)指標反(fan)映，其含義是按規定的(de)(de)(de)(de)電(dian)(dian)(dian)流(liu)進行放電(dian)(dian)(dian)的(de)(de)(de)(de)時間(jian)。相(xiang)同(tong)電(dian)(dian)(dian)壓的(de)(de)(de)(de)電(dian)(dian)(dian)池(chi)(chi)，安(an)(an)時數大(da)的(de)(de)(de)(de)容量大(da)；相(xiang)同(tong)安(an)(an)時數的(de)(de)(de)(de)電(dian)(dian)(dian)池(chi)(chi)，電(dian)(dian)(dian)壓高的(de)(de)(de)(de)容量大(da)，通(tong)常(chang)以電(dian)(dian)(dian)壓和安(an)(an)時數共同(tong)表示(shi)電(dian)(dian)(dian)池(chi)(chi)的(de)(de)(de)(de)容量，如12V/7AH、12V/24AH、12V/65AH、12V/100AH。

后備式UPS不(bu)間斷電(dian)源一般內置(zhi)4AH或7AH的電(dian)池(chi)(chi)，其備用(yong)時間是(shi)固定(ding)的；在線式與在線互動式UPS有內置(zhi)7AH電(dian)池(chi)(chi)的標準機(ji)(ji)型，也有外配大容(rong)量電(dian)池(chi)(chi)的長效機(ji)(ji)型，用(yong)戶可以根據(ju)需要實現(xian)的備用(yong)時間而確(que)定(ding)配備多大容(rong)量的電(dian)池(chi)(chi)。

后備(bei)時(shi)間(jian)就是市電(dian)(dian)(dian)斷電(dian)(dian)(dian)后UPS電(dian)(dian)(dian)源能夠提供(gong)給計算(suan)機等設備(bei)的(de)更(geng)大(da)(da)供(gong)電(dian)(dian)(dian)時(shi)間(jian)。你(ni)帶的(de)設備(bei)主功率越大(da)(da)，實際供(gong)電(dian)(dian)(dian)時(shi)間(jian)越短。后備(bei)時(shi)間(jian)是指額定的(de)功率下的(de)更(geng)大(da)(da)供(gong)電(dian)(dian)(dian)時(shi)間(jian)。

后備(bei)式(shi)UPS不間斷電(dian)源(yuan)供(gong)電(dian)設備(bei)的(de)(de)供(gong)電(dian)時(shi)長控制在8小時(shi)以(yi)(yi)內(nei)是(shi)比較好(hao)的(de)(de)做(zuo)法，這是(shi)為什么呢?需要長時(shi)間供(gong)電(dian)的(de)(de)UPS供(gong)電(dian)設備(bei)對電(dian)池(chi)的(de)(de)消耗大，成(cheng)本高(gao)，并(bing)且系統(tong)的(de)(de)不穩定性高(gao)，所以(yi)(yi)，顧客(ke)在購買UPS電(dian)源(yuan)的(de)(de)時(shi)候要好(hao)考慮一下電(dian)源(yuan)的(de)(de)成(cheng)本問題和穩定性。

(a)大(da)功率UPS電(dian)(dian)(dian)源一旦(dan)后備時(shi)間超長，必然喲使用(yong)上百(bai)只(zhi)電(dian)(dian)(dian)池(chi)(chi)供(gong)電(dian)(dian)(dian)形成多組(zu)電(dian)(dian)(dian)池(chi)(chi)的串聯(lian)和并(bing)聯(lian)使用(yong)。每只(zhi)電(dian)(dian)(dian)池(chi)(chi)對(dui)整個系統而言均為一個故(gu)障(zhang)單元。一旦(dan)一只(zhi)電(dian)(dian)(dian)池(chi)(chi)損壞，一組(zu)電(dian)(dian)(dian)池(chi)(chi)很快損壞。時(shi)間越(yue)長故(gu)障(zhang)單元越(yue)多，系統可靠性降低。具(ju)統計UPS系統的故(gu)障(zhang)80%來自電(dian)(dian)(dian)池(chi)(chi)。

(b)后(hou)備(bei)時間越長(chang)，購買電池所(suo)用資金(jin)比重(zhong)越大。以(yi)60KVAUPS為例，8小時電池所(suo)用資金(jin)是(shi)整套設備(bei)的(de)50%，而電池是(shi)易耗品，3-5年(nian)必須(xu)更換，造成資金(jin)浪(lang)費。