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OE1CGS01/05/2019
Die kleine Solarzelle kam akzeptabel verpackt und unbeschädigt an. Eine optische Qualitätskontrolle verlief sehr positiv, das Ding macht einen soliden Eindruck. Das Anlöten von Anschlussdrähten an die dafür vorgesehenen Kupferflächen ist auch völlig problemlos. Leider sind, wie so oft, die angeführten Leistungsparameter teilweise hoffnungslos übertrieben. Ich habe mir die Mühe gemacht und die Solarzelle gemessen und die Ergebnisse als Grafik beigefügt. Klarzustellen ist, dass die Messungen nicht unter Normbedingungen durchgeführt wurden, sondern in natura an einem wolkenlosen Tag bei mittlerer Sonnenhöhe in Mitteleuropa. Dadurch ist klar, dass die Daten aus Messungen unter Standardbedingungen nicht ganz erreicht werden können, andererseits sind sie aussagekräftiger für reale Anwendungen. Während die Ruhespannung mit 6,38 V nur etwas unter dem beworbenen Wert blieb, ist das mit dem Kurzschlussstrom von rd. 66 mA schon ganz anders. Insgesamt kann von einer Leistung von 2 W nicht einmal geträumt werden. Bei mir war knapp über 300 mW Schluss. Die gute Nachricht: Der MPP liegt knapp über 5V, damit ist die Solarzelle hervorragend für den Direktbetrieb kleiner Mikrocontrollerprojekte geeignet. Und dafür reicht dann vielleicht auch der verfügbare Strom von ca. 55 mA aus.
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