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Old Dec 23, 2011, 07:18 PM
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I just got the email today from FMA on the MPA. Looks like I'm buying one as soon as the web site confirms that they are on the shelf. It will sure clear up a lot of clutter on my bench when I charge my lipos. The 1S connectors were a nice touch.
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Old Dec 23, 2011, 10:28 PM
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Quote:
Originally Posted by Stumblebee View Post
I just got the email today from FMA on the MPA. Looks like I'm buying one as soon as the web site confirms that they are on the shelf. It will sure clear up a lot of clutter on my bench when I charge my lipos. The 1S connectors were a nice touch.
Hi:

You must have missed the first one that went out on 12/16/11 then?

http://www.revolectrix.com/new_appli...t12.16.11.html

Tim Marks
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Old Jan 03, 2012, 04:30 PM
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just curious - can you 1s off of a deans w/o a balance connection? Not all 1s are micro...

I guess I am just trying to figure out what adapter would be needed. I know assumptions are dangerous. I don't know if the 1s pack can be charged as a "balanced" pack without connecting to the balanced lead (or if it would have to be charged as an unbalanced pack with an amp limit). Likewise, if I had to have a balanced lead, I don't know if I could make an adapter and grab either the first 2 of the jst pins or the outer two and cheat.
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Old Jan 03, 2012, 06:02 PM
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Tim can verify but I expect the answer is yes.

Glen
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Old Jan 03, 2012, 07:44 PM
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Quote:
Originally Posted by chainlink View Post
just curious - can you 1s off of a deans w/o a balance connection? Not all 1s are micro...

I guess I am just trying to figure out what adapter would be needed. I know assumptions are dangerous. I don't know if the 1s pack can be charged as a "balanced" pack without connecting to the balanced lead (or if it would have to be charged as an unbalanced pack with an amp limit). Likewise, if I had to have a balanced lead, I don't know if I could make an adapter and grab either the first 2 of the jst pins or the outer two and cheat.
Hi:

Yes, the preferred method would be to connect to one of the Deans. The Deans are not related to the balance ports in any way. You'd need to use an unbalanced preset if using a Revolectrix charger/battery workstation.

Tim Marks
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Old Jan 11, 2012, 02:07 PM
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Any idea when these will start shipping? My order still says "Pending Fulfillment".
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Old Jan 11, 2012, 02:10 PM
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I got an email yesterday stating that my order has been shipped. Just waiting for the post office.
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Old Jan 11, 2012, 05:56 PM
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Originally Posted by HansAuf View Post
Any idea when these will start shipping? My order still says "Pending Fulfillment".
Hi,

Send an e-mail to jamie@fmadirect.com with your name and SO number. I will give you the best estimate I can as to when your order will ship based on where it sits in the queue.


Regards,
Jamie Marks
FMA Direct/REVO USA
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Old Jan 11, 2012, 07:30 PM
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Thanks Jamie. Email sent.
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Old Jan 12, 2012, 10:43 AM
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Count me as another Power Pole user that would like bare wires that I can just crimp the PP's on to before ever firing it up. I don't want to make 6 Deans to PP jumpers either.
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Old Jan 12, 2012, 11:20 AM
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Originally Posted by aerosheldon View Post
Count me as another Power Pole user that would like bare wires that I can just crimp the PP's on to before ever firing it up. I don't want to make 6 Deans to PP jumpers either.
Looks like converters are the only option now. that is what I am doing anyway. A bare wire option would be good.
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Old Jan 16, 2012, 05:11 PM
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Is there a limit in voltage difference using same cell count packs that can be connected? i.e if one 4s battery has 20% and a 2nd has 80% and both are connected to the board.
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Old Jan 16, 2012, 05:37 PM
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Originally Posted by topgearuk View Post
Is there a limit in voltage difference using same cell count packs that can be connected? i.e if one 4s battery has 20% and a 2nd has 80% and both are connected to the board.
Hello:

As far as the MPA goes, it won't be possible to cause any damage to the unit, the wiring, or the charger to which it is connected by intereconnecting batteries of vastly different charge states.

However, as far as the batteries go, it's a good idea for the packs to be of similar states of charge. There are a ton of threads in RCG and other forums that discuss this topic. Our observations have shown that no matter what the state of charge, the initial surge currents which flow from a "full" battery to a "dead" battery are not as large as one might think, and the duration of high-current, un-regulated "charging" generally fairly short; e.g., even at 80% and 20% states, you're likely looking at 10-20A for a few seconds, followed by 5A-10A for 1-3 minutes. Whether that's enough to damage your batteries depends on too many factors to discuss here. It seems obvious that a 10C-charge-capable LiPo could withstand it better than a 1C capable LiPo.

Most would agree that if the individual cells are within 0.1V, it's a good rule of thumb and safe for pretty much any LiPo battery, although that value could be a bit overly contstraining, in my opinion.

Hope this helps!

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Old Jan 16, 2012, 05:47 PM
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Thanks for your reply, It does help a bit, I understand about cell voltage being very close when not using you MPA.. This is what I do now.. And I always make sure my batteries are normally with-in 0.1v..
But the impression I got was if using your MPA it would limit the max cross flow between batteries to 1A anyway?? or have I got that wrong?
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Old Jan 16, 2012, 05:56 PM
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Originally Posted by topgearuk View Post
Thanks for your reply, It does help a bit, I understand about cell voltage being very close when not using you MPA.. This is what I do now.. And I always make sure my batteries are normally with-in 0.1v..
But the impression I got was if using your MPA it would limit the max cross flow between batteries to 1A anyway?? or have I got that wrong?
Hi:

Good question. The MPA will limit the flow of current on the balance wires to 1A, but as soon as you connect the main pack leads together, the current flow is only limited by the internal resistance of the batteries (which is very low, and varies from chemistry-to-chemistry). There is no other protection, thermal fuse or otherwise on your main pack leads. Current always chooses the path of least resistance.

So this is why the MPA will protect all of the balance wires, and your main pack wires will always be able to handle many times the current surge while the paralleled packs equalize. So the only remaining question is, how well can your LiPos tolerate, e.g., 5C or 10C charge for 1-3 minutes. I think most good quality LiPo these days won't break a sweat on it. So it's likely peoples' concern over this topic is over-stated, IMO.

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