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12.12.2007, 12:03 PM
I have something interesting to report!
I finally got my DPR back and put it on my BL X1CR to check what kind of numbers it pushes. I downloaded the data off it now and have been scratching my head trying to figure out why its current readings are so whacked.
The current graph starts at 0 when everything is powered up. But after that the graph shoots abnormally high! I'm getting readings of over 90A on a 10S buggy! Then I noticed where the graph settled when the car was stationary (had a few flips). Even though very little current was flowing at that moment, the graph reflects about 26A. Here's the most interesting bit!
I also noticed short spikes below 26A. The largest of those spikes that reached 0A reflects the battery pack being at 42V at the same time. Here's my take on it:
The DPR resets its zero point if the direction of current flow reverses. So when I connected everything up it's 0A point was true zero (ignoring radio load). The moment I braked for the first time, current flowed in the opposite direction back to the battery! The magnitude of the reverse current set a new zero point, and the old zero point effectively becomes a positive value on the graph.
I'll post the graphs shortly. But I feel pretty confident to say that a Kontronik Jazz ESC does recharge the pack under a braking condition! What's more is it seems like it caps the max voltage according to the lipo cell count (it is programmed in lipo mode). What's scary is that this means that my packs had to endure 26A spikes of charge current! Well, I'm not sure what the implications of that are, but they're not overheating or puffing, so I guess time will tell. :)
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