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，充電電池是四節鎳氫電(dian)(dian)(dian)(dian)池(chi)串聯(lian)。串聯(lian)一個電(dian)(dian)(dian)(dian)流(liu)表監視(shi)充電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流(liu)（100uA表頭并(bing)聯(lian)電(dian)(dian)(dian)(dian)阻改為100mA電(dian)(dian)(dian)(dian)流(liu)表）。沒(mei)有什么線路，直接把電(dian)(dian)(dian)(dian)池(chi)組和太(tai)陽能電(dian)(dian)(dian)(dian)池(chi)組并(bing)聯(lian)就(jiu)可以了。

    充電電流隨(sui)陽(yang)光強度變化(hua)，在無直射的(de)情(qing)況下，充電(dian)電(dian)流約１０多(duo)mA；

    強烈(lie)日光直射下，充(chong)電電流(liu)可以達到(dao)和超過(guo)100mA。

    這(zhe)樣(yang)就(jiu)行了，大家可(ke)以估(gu)算，在(zai)晴(qing)到多(duo)云天(tian)氣(qi)，每(mei)天(tian)充(chong)入(ru)電(dian)(dian)(dian)(dian)(dian)量(liang)約400-800mAh，這(zhe)樣(yang)一組實(shi)際容量(liang)2000mAh的鎳氫電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)，３到６天(tian)可(ke)以充(chong)滿(man)。不用(yong)(yong)擔心充(chong)電(dian)(dian)(dian)(dian)(dian)問題(ti)，對(dui)電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)講這(zhe)是涓流(liu)充(chong)電(dian)(dian)(dian)(dian)(dian)。太陽能(neng)電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)組放在(zai)窗臺(tai)外面(mian)，能(neng)曬(shai)到太陽的地方，電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)組放在(zai)窗臺(tai)里(li)面(mian)，不要讓太陽直射為(wei)好。在(zai)晚上，由于沒有陽光，充(chong)電(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)流(liu)為(wei)０，不用(yong)(yong)擔心電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)會對(dui)太陽能(neng)電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)放電(dian)(dian)(dian)(dian)(dian)，所(suo)以也不用(yong)(yong)管(guan)它。我(wo)還試過(guo)，用(yong)(yong)一個太陽能(neng)單(dan)元(yuan)對(dui)一節電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)充(chong)電(dian)(dian)(dian)(dian)(dian)，實(shi)際充(chong)電(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)流(liu)和(he)上面(mian)介紹相同(tong)。如果你用(yong)(yong)MP3，這(zhe)樣(yang)做(zuo)完全可(ke)以了，一個太陽能(neng)單(dan)元(yuan)加上２節AAA電(dian)(dian)(dian)(dian)(dian)池(chi)(chi)(chi)，一個用(yong)(yong)著(zhu)，一個曬(shai)著(zhu)，輪流(liu)使用(yong)(yong)，基本解決(jue)了能(neng)源問題(ti)。

    最后看一個實測充電曲線

    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）
    計算得到平(ping)均充電(dian)電(dian)流：68.8mA。