|Nov 20, 2012, 09:44 PM|
Joined May 2008
Explain the Benefits of the Multi-Port Safe Parallel Adapter (MPA)
I own a couple of Celpro 4s' and I'm looking to upgrade. One charger on my list is the PL6. I've been learning about parallel charging, and I've read all the features of the MPA boards, but I don't quite understand what all those features (fuses, thermal indicators, etc) protect me from. Can someone explain?
Also, when using the MPA's do you still have to make sure that all the batteries are in a similar state of charge, or is one of the benefits of the MPA that you don't have to worry about that.
Thanks in advance for any information.
|Nov 20, 2012, 11:25 PM|
Joined Sep 2007
With any parallel board or harness its very easy to accidentally plug one in backwards. Even though the plugs are keyed, the evidence keep mounting that people are still doing it. Additionally if a cell on one of the packs fails in a way that its voltage drops, the fuses will prevent high rates of current from the other cells in parallel from flooding into the weak cell.
This is more common than you might think. Yet many still use unfused boards. Or worse, use this as a reason to stop parallel charging. The MPA addresses these risks.
Traces Burned Twice
Three Reports of Burned traces
Balance wire burned
Balance Wires Shorted
Charge Lead plugged in backwards
Balance wires burned
Batteries balance wires burned using parallel board.
|Nov 23, 2012, 10:57 AM|
Joined May 2006
Anyway, that's what I do, and only connect the main leads some seconds after all the balance plugs are connected. I also will note that I don't connect fully charged packs with depleted packs, but connect packs that I have flown that day, so all have been discharged at least some, and most are probably at similar charge states.
added: Just one more comment--you do need to be a little careful if one of the packs is pretty small in capacity --such that 2A is a very high charge rate for it. If the other pack is a much larger capacity, and also in a much higher charge state, it could be possible that you could be charging the small pack at a very high rate. Not sure how likely this is, because the small pack will raise its voltage pretty fast so the current will drop off fast. But just saying that one should use some common sense.
|Nov 23, 2012, 12:24 PM|
Actually, the thermal fuses limit current flow to 1A, not 2A.
|Nov 25, 2012, 08:06 PM|
Joined May 2006
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