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d) Entladestrom
Normativ wird die Akkukapazität bei einem Entladestrom von 0,2 C ermittelt. Für die
Beispiel-Akkus bedeutet dies:
1000 mAh x 0,2 = 200 mA
2700 mAh x 0,2 = 540 mA
Es ist der Entladestrom zu wählen, welcher der Berechnung am nächsten kommt. Für den
1000 mAh-Akku sind dies 250 mA und für den 2700 mAh-Akku ergibt sich ein Entlade-
strom von 500 mA.
¼
Ermittelt man langfristig die Kapazität eines Akkus immer mit dem gleichen
Entladestrom, so lässt sich daraus sein aktueller Zustand (Kapazitätsverlust)
ableiten.
Die entnehmbare Kapazität ist stark vom Entladestrom abhängt: Je niedriger der
Entladestrom, desto größer ist die entnehmbare Kapazität.
Da der Akku über Widerstände entladen wird, ist der tatsächliche Entladestrom von
der aktuellen Akkuspannung abhängig. Dies berücksichtigt selbstverständlich die
Kapazitätsberechnung (DCAP) des „Charge Manager 420“.
13


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