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)四節鎳(nie)氫電(dian)(dian)池串聯(lian)。串聯(lian)一個電(dian)(dian)流(liu)表監視充電(dian)(dian)電(dian)(dian)流(liu)（100uA表頭并(bing)(bing)聯(lian)電(dian)(dian)阻改為100mA電(dian)(dian)流(liu)表）。沒有什么線路，直(zhi)接(jie)把電(dian)(dian)池組(zu)和太陽能電(dian)(dian)池組(zu)并(bing)(bing)聯(lian)就(jiu)可(ke)以了。

    充電電流隨(sui)陽光(guang)強(qiang)度變化，在無(wu)直射的(de)情況下，充電(dian)電(dian)流約(yue)１０多mA；

    強烈日光直(zhi)射下，充電(dian)電(dian)流可以達到和超過100mA。

    這(zhe)樣(yang)就(jiu)行了(le)(le)，大家可以估算，在(zai)晴(qing)到(dao)多云天氣，每天充(chong)(chong)入電(dian)(dian)(dian)(dian)量約400-800mAh，這(zhe)樣(yang)一組(zu)實際(ji)容量2000mAh的鎳氫電(dian)(dian)(dian)(dian)池(chi)，３到(dao)６天可以充(chong)(chong)滿。不用擔(dan)心充(chong)(chong)電(dian)(dian)(dian)(dian)問題(ti)，對(dui)(dui)電(dian)(dian)(dian)(dian)池(chi)講這(zhe)是涓流(liu)充(chong)(chong)電(dian)(dian)(dian)(dian)。太(tai)(tai)陽(yang)(yang)能(neng)(neng)電(dian)(dian)(dian)(dian)池(chi)組(zu)放(fang)在(zai)窗臺外面(mian)，能(neng)(neng)曬到(dao)太(tai)(tai)陽(yang)(yang)的地方，電(dian)(dian)(dian)(dian)池(chi)組(zu)放(fang)在(zai)窗臺里(li)面(mian)，不要讓太(tai)(tai)陽(yang)(yang)直(zhi)射為好。在(zai)晚(wan)上(shang)，由于沒有陽(yang)(yang)光，充(chong)(chong)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流(liu)為０，不用擔(dan)心電(dian)(dian)(dian)(dian)池(chi)會(hui)對(dui)(dui)太(tai)(tai)陽(yang)(yang)能(neng)(neng)電(dian)(dian)(dian)(dian)池(chi)放(fang)電(dian)(dian)(dian)(dian)，所以也不用管它。我(wo)還試過，用一個(ge)太(tai)(tai)陽(yang)(yang)能(neng)(neng)單(dan)元對(dui)(dui)一節電(dian)(dian)(dian)(dian)池(chi)充(chong)(chong)電(dian)(dian)(dian)(dian)，實際(ji)充(chong)(chong)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流(liu)和上(shang)面(mian)介紹相同。如(ru)果(guo)你用MP3，這(zhe)樣(yang)做完全可以了(le)(le)，一個(ge)太(tai)(tai)陽(yang)(yang)能(neng)(neng)單(dan)元加上(shang)２節AAA電(dian)(dian)(dian)(dian)池(chi)，一個(ge)用著，一個(ge)曬著，輪流(liu)使用，基本解決了(le)(le)能(neng)(neng)源問題(ti)。

    最后看(kan)一個(ge)實測充電(dian)曲線

    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(de)到平均充電(dian)電(dian)流：68.8mA。