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AS Greg alluded to , there is a problem with charging while rolling. When a battery goes on a charger, the charge cycle does not start instantly. There is a reaction delay(chemical/molecular) that takes place first. Charging commences at some finite point after voltage is applied to the cells. The interval is small but present none the less. Charging while rolling would present enough intermittent contact -unless you had PERFECTLY CLEAN rails- that the actual charge cycle would always lag the input such that it is unlikely any significant charge could result. Rolling wheel contacts are really very poor contacts. Direct dc motor drive works because the motors have inertia and the available power levels are high to drive the armature easily. (why track power locos stall at slow speed often) but the actual contact is very inconsistent.
Now, charging from rails while stationary is certainly commonly done , but rolling will really never get much charge into the battery pack., plus you will never know the actual state of charge in your packs, since charging is intermittent, and as Greg said, any processor based charge will constantly reset.
Jonathan/EMW
 
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