dogman wrote:Well, you just learned lesson one. One bare wire at a time, never two.
Lesson two, after you put the color coded covers on, check polarity one more time. Amazing how many times I've mixed em up, though I was positive I had it right.
dnmun wrote:really, i would like it if you posted up the thread about why the diodes are needed.
does the diode have to be high voltage equivalent to the battery voltage?
when combining dissimilar chemistries in parallel, the diode only had to be rated at the difference in voltage between the two packs when discharged, so how do you know what value to use for the lifpo4 packs, and really why are they needed. i really would like to know.
even with graduate degrees in physics and EE, i still don't understand how it works to damage the battery. so please post up the thread if you will.
...In series, you need the reverse diodes across the battery to protect the BMS from the other pack. You would also need to check to see that the chargers were isolated or disconnect the packs for charging. Otherwise, I don't see any issues with putting them in series.
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