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Gennemsnitlige opladningstider
Afhængigt af akkuernes type, alder og restladetil-
stand er der forskel på opladningens varighed. De
gennemsnitlige ladetider kan ses i den efterfølgen-
de tabel. Bemærk dog, at de nævnte tider er
retningsvisende.
Akkuer type 9 V-blok
Kapacitet Ni-MH Ni-Cd
200 mAh 280 min ---
100 mAh --- 140 min
Akkuer type D
Kapacitet Ni-MH Ni-Cd
4500 mAh 400 min ---
1800 mAh --- 160 min
Akkuer type C
Kapacitet Ni-MH Ni-Cd
4000 mAh 360 min ---
1800 mAh --- 160 min
Akkuer type AA
Kapacitet Ni-MH Ni-Cd
2500 mAh 225 min ---
800 mAh --- 70 min
Akkuer type AAA
Kapacitet Ni-MH Ni-Cd
900 mAh 245 min ---
300 mAh --- 80 min
Beregning af ladetiden
Ladetid (min.) =
Akk
uens kapacitet (mAh) x 1,5 x 60
Apparatets ladestrøm (mA)
Automatisk ladekontrol/
vedligeholdelsesladning
Dette universal-akkuladeapparat styrer ladetiden for
genopladelige batterier af typen Ni-Cd og Ni-MH
separat. Til grund for denne styring ligger –∆ U
(„minus delta U“) metoden.
Inden for matematikken betegner man differencer
med delta ∆.
„Minus delta U“ betyder i dette tilfælde en negativ
spændingsdifference.
Denne registrering af slut for opladningen bruger
følgende metode:
Hvis en akku oplades med konstant strøm, stiger
spændingen hele tiden. Når akkuen er fuld, når
spændingen dog et maksimum og falder en smule
igen ved yderligere strømflow. Dette lette spæn-
dingsfald registreres af ladeelektronikken, og oplad-
ningen afsluttes. Universal-akkuladeapparatet slår
automatisk over på „vedligeholdelsesladning“. Det
betyder, at akkuerne ikke oplades med permanent
strøm længere, men med korte strømimpulser.
Derved modvirkes selvafladning, og akkuerne
holdes i en komplet ladetilstand.
IB_KH980_E33078_LB3 28.05.2009 11:23 Uhr Seite 29
31


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