為節約能源，試用太陽能給鎳氫電池充電。 最關心的是這樣做的成本多少，效果如何。試下來還算比較滿意的。太陽能電池用了３個單元串聯使用，這太陽能電池單元購于東明，一共３０元。在陽光下空載輸出的最高電壓超過了７Ｖ。這樣用這個太陽能電池對鎳氫電池組充電，充電電池是(shi)四(si)節鎳(nie)氫(qing)電(dian)(dian)池(chi)串(chuan)聯(lian)(lian)。串(chuan)聯(lian)(lian)一(yi)個電(dian)(dian)流(liu)表(biao)監視(shi)充電(dian)(dian)電(dian)(dian)流(liu)（100uA表(biao)頭并聯(lian)(lian)電(dian)(dian)阻改為100mA電(dian)(dian)流(liu)表(biao)）。沒有(you)什么線(xian)路(lu)，直接把電(dian)(dian)池(chi)組和太陽能(neng)電(dian)(dian)池(chi)組并聯(lian)(lian)就可以了。

    充電電流隨陽光強度(du)變化，在(zai)無(wu)直(zhi)射的情況(kuang)下(xia)，充電(dian)電(dian)流約１０多(duo)mA；

    強烈(lie)日(ri)光直射下，充電(dian)電(dian)流(liu)可以達到(dao)和(he)超過100mA。

    這樣(yang)就行了，大家可以(yi)估算，在晴到多云天氣，每天充入電(dian)(dian)(dian)(dian)(dian)(dian)(dian)量約400-800mAh，這樣(yang)一(yi)(yi)組(zu)實際(ji)容量2000mAh的鎳氫(qing)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)，３到６天可以(yi)充滿。不用(yong)(yong)擔(dan)(dan)心(xin)充電(dian)(dian)(dian)(dian)(dian)(dian)(dian)問題，對電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)講(jiang)這是涓流(liu)(liu)充電(dian)(dian)(dian)(dian)(dian)(dian)(dian)。太(tai)(tai)陽(yang)(yang)能電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)組(zu)放在窗(chuang)臺外面，能曬到太(tai)(tai)陽(yang)(yang)的地方，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)組(zu)放在窗(chuang)臺里面，不要(yao)讓太(tai)(tai)陽(yang)(yang)直(zhi)射為好。在晚上，由于沒有陽(yang)(yang)光(guang)，充電(dian)(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)為０，不用(yong)(yong)擔(dan)(dan)心(xin)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)會對太(tai)(tai)陽(yang)(yang)能電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)放電(dian)(dian)(dian)(dian)(dian)(dian)(dian)，所以(yi)也不用(yong)(yong)管(guan)它(ta)。我還試過，用(yong)(yong)一(yi)(yi)個(ge)太(tai)(tai)陽(yang)(yang)能單元對一(yi)(yi)節(jie)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)充電(dian)(dian)(dian)(dian)(dian)(dian)(dian)，實際(ji)充電(dian)(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)和上面介紹相同(tong)。如果你用(yong)(yong)MP3，這樣(yang)做完全可以(yi)了，一(yi)(yi)個(ge)太(tai)(tai)陽(yang)(yang)能單元加上２節(jie)AAA電(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)(chi)，一(yi)(yi)個(ge)用(yong)(yong)著，一(yi)(yi)個(ge)曬著，輪流(liu)(liu)使用(yong)(yong)，基(ji)本解決了能源問題。

    最后(hou)看一個實測充電曲線(xian)

    時間：２００４年８月２７日上午
    天氣：晴到多云。
    Ｘ軸：時間（共2個小時）
    Ｙ軸：充電電流（單位mA）
    計算得到平均充電電流：68.8mA。