I'm a big A123 fan myself, and have several 2S-1100 mah packs. I was using them in my Integral for the radio and was still well under the 5K limit.<br><br>I switched over to using the motor batts for the radio not because of weight, but for simplicity (read - laziness). Using the motor batteries eliminates another charger (w/power supply) that I have to drag to the field and another battery that I have to manage / worry about.<br>
<br>Now the only two batteries (and chargers) that I have to be concerned with are the motor batteries and my transmitter batteries. The little 2S backup gets charged at the beginning of the day and is just along for the ride.<br>
<br clear="all"><br>Keith Hoard<br>Collierville, TN<br><a href="mailto:khoard@gmail.com">khoard@gmail.com</a><br><br><br>
<br><br><div class="gmail_quote">On Tue, Jan 24, 2012 at 11:30 AM, Wayne Galligan <span dir="ltr"><<a href="mailto:wcgalligan@att.net">wcgalligan@att.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">
<div dir="ltr">
<div style="font-size:12pt;font-family:'Calibri'">
<div>After all this discussion about extra wire connectors and regulators, etc.,
etc. Interesting as it seems.</div>
<div>Why not use an 1100 mil A123 pack for the receiver without the
regulator.<i> </i>I haven't weighed the difference but it couldn’t be
that much.</div>
<div>Sounds like your going for a lot extra work to save a few “Grams”.
</div>
<div> </div>
<div>Simplicity rules.</div>
<div> </div>
<div style="font-size:12pt;font-family:'Calibri'">Wayne
Galligan<br></div>
<div style="font-size:small;font-style:normal;text-decoration:none;font-family:'Calibri';display:inline;font-weight:normal">
<div style="FONT:10pt tahoma">
<div> </div>
<div style="BACKGROUND:#f5f5f5">
<div><b>From:</b> <a title="khoard@gmail.com" href="mailto:khoard@gmail.com" target="_blank">Keith Hoard</a> </div>
<div><b>Sent:</b> Tuesday, January 24, 2012 10:01 AM</div>
<div><b>To:</b> <a title="nsrca-discussion@lists.nsrca.org" href="mailto:nsrca-discussion@lists.nsrca.org" target="_blank">General pattern discussion</a>
</div><div><div class="h5">
<div><b>Subject:</b> Re: [NSRCA-discussion] Main battery redundant lead for
receiver</div></div></div></div></div>
<div> </div></div><div><div class="h5">
<div style="font-size:small;font-style:normal;text-decoration:none;font-family:'Calibri';display:inline;font-weight:normal">Anthony,<br><br>
On a typical flight, I'm guessing the radio only uses around 100-150Mah of
power, while the motor is using 4000Mah, so that's about 4% more draw on those
two cells. In practice, I haven't been able to see any difference in the
radio cells when I hook them up to my charger at the end of a flight.
Sometimes cells #1 & #2 are the high cells after a flight, so I think the
power draw of the radio is negligible to our motor packs.<br><br>The problem
with two regulators plugged into the same 10S (or 5S) pack is that you are
creating a dead short between the cells thru the ground wires (typically a
straight wire thru the regulator). <br><br>Say you plug Regulator #1 into
cells #1&2, and Regulator #2 into cells #6&7. The regulator's
<b><i>ground </i></b>wires now have 5 cells of voltage potential (5 X 4.2V =
21Volts) between them since they are plugged into cells # 1 and #6. When
those two ground wires are then plugged into your receiver either thru a switch
or direct connection the magic smoke will escape and your retailer will
rejoice.<br><br>Also, if you have both of your regulators plugged into your
motor pack and the packs eject like Goose in Top Gun, you've lost both of your
redundant power sources. However, if you use a tiny 2S LiPo that is
physically separated and secured inside your plane, you have both electrical and
physical redundancy. <br><br>Hmmm, just thought of something . . . maybe
we should tie down the receiver so the main regulator can't take the receiver
out with it. . . so many contingencies, so little weight . . .<br clear="all"><br>Keith Hoard<br>Collierville, TN<br><a href="mailto:khoard@gmail.com" target="_blank">khoard@gmail.com</a><br><br><br><br><br>
<div class="gmail_quote">On Tue, Jan 24, 2012 at 8:15 AM, Anthony Romano <span dir="ltr"><<a href="mailto:anthonyr105@hotmail.com" target="_blank">anthonyr105@hotmail.com</a>></span>
wrote:<br>
<blockquote style="BORDER-LEFT:#ccc 1px solid;MARGIN:0px 0px 0px 0.8ex;PADDING-LEFT:1ex" class="gmail_quote">
<div>
<div dir="ltr">Seems like a great idea but I have two questions. Do the packs
come down out of balance since two cells are serving extra load? Is there a
problem with parallel operation of two
regulators?<br> <br>Thanks,<br> <br>Anthony<br> <br>
<div>
<div></div>
<hr>
From: <a href="mailto:joddino@socal.rr.com" target="_blank">joddino@socal.rr.com</a><br>Date: Mon, 23 Jan 2012 15:25:00
-0800<br>To: <a href="mailto:nsrca-discussion@lists.nsrca.org" target="_blank">nsrca-discussion@lists.nsrca.org</a><br>Subject: Re:
[NSRCA-discussion] Main battery redundant lead for receiver<br><br>I've been
using this setup for sometime and it is working great. I have my two
cell LiPo charged to 7.5 volts and it is connected to a 6.0 volt regulator
into the receiver. The cable connected to the balance connector on the
"bottom" 5S is connected to a 6.3 volt regulator so it supplies all the
current to the system and the 2S pack never needs charging. I'm using an
800 mAh pack but it could be even smaller.
<div> </div>
<div>Jim O<br>
<div> </div>
<div>
<div> </div>
<div>
<div>On Jan 23, 2012, at 2:09 PM, Scott McHarg wrote:</div><br>
<blockquote>Guys,<br> Chris Moon just e-mailed me about some
leads that were done at the factory. These leads run off your balance
leads to a voltage regulator and allow your main battery pack to be utilized
as a redundant receiver battery. It is NOT meant to be a primary but
it will save 20+ grams if you're running 2 rx batteries. You still
have to run the 2nd regulator for true redundancy but you eliminate the 2nd
battery. These leads are factory made and eliminate the need to make
them yourself with the concern about plugging in to the wrong cell. I
know in my article, I was pretty much against doing this as a backup but,
with Chris having this made at the factory, he has all but eliminated making
a mistake by tying to the wrong cell. I have the link that I'll e-mail
you off-list or you can just go to his website. I don't want to break
the NSRCA list rules by advertising for him even though he advertises with
the NSRCA. The leads are only $3.99 each and are found under the
Connectors/Adapters listing.<br><br>Thank,<br>Scott<br clear="all"><br>--
<br><b style="COLOR:rgb(51,51,255)"><font style="FONT-FAMILY:comic sans ms,sans-serif" size="4">Scott A.
McHarg</font></b><br><br>_______________________________________________<br>NSRCA-discussion
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