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Old 06-23-2009, 04:14 AM   #1790 (permalink)
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Originally Posted by wjdennis View Post
Black Panther, this discussion has moved to another thread "Open ReVolt as Charger". But with the setup you mention, how would I control the amount of current that the lower C pack delivers? The purpose of the controller was to not let the lower C pack go above 70A. If the two packs were just connected through Mosfets, I wouldn't be limiting that. In that case, I might as well just do away with the Mosfets altogether and just connect the two packs directly to each other.


I couldn't find the new thread. anyway the idea is that the second pack would be smaller capacity, but newer tech with a high C rating and the same nominal voltage. if preserved as a fresh pack until that hill, when you paralleled them, the second pack should supply the majority of the current simply by the balance of each packs capability to deliver the current. your low C pack will tend to sag as it approaches its c rating and when paralleled to a high C pack which maintains the voltage, the low C pack will not be able to push as much current because the paralleled voltage is higher than what it can push that much current in to.

Without the second pack connected, the voltage would drop more under load and your low C pack delivers more current at the expense of battery stress.

With the high C pack connected, the high C pack will not stress until much higher current loads, so it can keep the paralleled voltage at a respectable level until you have nearly depleted them.

I hope this clarifies it somewhat.
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