[NSRCA-discussion] FW: 10s LiPo Charger Recommendation

Thu Oct 8 12:08:16 AKDT 2015

Real men "parallel Charge" ! ☺

On Thu, Oct 8, 2015 at 1:05 PM, Keith Hoard via NSRCA-discussion <
nsrca-discussion at lists.nsrca.org> wrote:

> No.  Parallel charging works great.  Georg Simon Ohm is right there
> managing the charge to make sure every pack is topped off at the exact same
> time. The only way it can fail is if the laws of physics were suddenly
> repealed during a charge cycle.  I use the FMA MPA board which has 40 amp
> automotive fuses between main charge leads, and 1 amp thermal resettable
> fuses between every cell tap.
>
>
>
> For the benefit of the R/C community, I have activated every electrical
> short / failure mode applicable to this board and have not ruined one pack.
>
>
>
> *From:* Ed Alt [mailto:ed_alt at hotmail.com]
> *Sent:* Thursday, October 8, 2015 15:54
> *To:* Keith Hoard <klhoard at outlook.com>; General pattern discussion <
> nsrca-discussion at lists.nsrca.org>
> *Subject:* Re: [NSRCA-discussion] FW: 10s LiPo Charger Recommendation
>
>
>
> Although I haven't done parallel charging, it seems like it would be ok
> within certain limits.  The main limiting factor might be the path
> resistance between parallel cells, but really only in the case of high C
> rate charging.  That's a theory anyway.  What has your experience been at
> high C rates? Does it seem to make much difference?
>
>
>
> Ed
>
>
> On Oct 8, 2015, at 3:09 PM, Keith Hoard via NSRCA-discussion <
> nsrca-discussion at lists.nsrca.org> wrote:
>
>
>
> I have found that the loudest detractors of parallel charging have no
> experience parallel charging.  When I ask them to point to an  incident
> where parallel charging caused a problem, the answer is always “Well, I
> read on the internet . . . “
>
> .
>
> I do a lot of parallel charging, and have no problem “putting the spurs”
> to my packs during charge if I’m ready to get in the air.  To dispel one
> myth right now, a good quality charger **WILL** detect a bad cell during
> parallel charging.
>
>
>
> (steps up on soapbox) . . .
>
>
>
> **I HAVE ACTUALLY SEEN IT WITH MY OWN EYES AND CONFIRMED IT WITH FURTHER
> TESTS**
>
> **PLEASE DON’T KEEP REFERRING ME BACK TO “THE INTERNET”**
>
> **IF YOU GIVE ME ONE OF YOUR CRAPPY PUFFED UP PACKS, I’LL PUT IT ON WITH
> ONE OF MY GOOD PACKS AND SHOW YOU**
>
>
>
> OK, with that statement out of the way . . . . (steps down off soapbox) .
> . . .
>
>
>
> The only time that bad cell **MAY** be masked is if you are parallel
> charging 4 or 6 packs.  In practical use, you would only be parallel
> charging that many batteries on very rare occasions, perhaps once per
> season.  Besides, most chargers out there don’t have enough ass to charge 6
> pattern packs in parallel and be done before sundown anyway.  However, you
> should not be relying on your charger as the only point in your routine to
> detect bad cells.
>
>
>
> In my experience,  folks with bad cells and puffy packs are doing a myriad
> of other no-no’s.  The worst is taking their batteries home on a full
> charge and letting them sit all week or all winter.  My soapbox finally
> broke down on that one and now I just smile and say “That’s too bad” and
> keep walking down the flight line.
>
>
>
> Ironically, the “straw that broke the camel’s back” for me was an H1B
> German Engineer who flies at our field asked me how I keep my packs from
> puffing up. Every time I said “storage charge at the end of the day”, he
> would reply “I don’t do that.” Then I said, “Yes, that’s why your batteries
> are all puffy and trashed.”  To which he replied “Yes, I charge my
> batteries to 100% before taking them home.”  . . . <Sigh> . . .
>
>
>
> I now understand how VW got busted.
>
>
>
> *From:* NSRCA-discussion [mailto:nsrca-discussion-bounces at lists.nsrca.org
> <nsrca-discussion-bounces at lists.nsrca.org>] *On Behalf Of *Vicente
> Bortone via NSRCA-discussion
> *Sent:* Thursday, October 8, 2015 13:16
> *To:* James Hiller <jnhiller at earthlink.net>; General pattern discussion <
> nsrca-discussion at lists.nsrca.org>
> *Subject:* Re: [NSRCA-discussion] 10s LiPo Charger Recommendation
>
>
>
> For some reason TP does not recommend parallel charging.  Probably because
> it is difficult to keep track of each cell and values are averaged.   Is
> this really an important factor?  At this point I just following
> instructions.  This factor could be important to decide what charger to buy.
>
>
>
> Vicente "Vince" Bortone
>
> On Thursday, October 8, 2015, James Hiller via NSRCA-discussion <
> nsrca-discussion at lists.nsrca.org> wrote:
>
> Plug & play charge box from Progressive RC (see photo).
> Parallel charging 5 flight packs in one session while having a couple cold
> ones!
> Jim
>
>
> -----Original Message-----
> From: NSRCA-discussion [mailto:nsrca-discussion-bounces at lists.nsrca.org]
> On Behalf Of Dr. Michael Harrison, DDS via NSRCA-discussion
> Sent: Thursday, October 08, 2015 9:46 AM
> To: 'Earl Haury'; 'General pattern discussion'
> Subject: Re: [NSRCA-discussion] 10s LiPo Charger Recommendation
>
> lol
>
> -----Original Message-----
> From: NSRCA-discussion [mailto:nsrca-discussion-bounces at lists.nsrca.org]
> On Behalf Of Earl Haury via NSRCA-discussion
> Sent: Thursday, October 08, 2015 8:26 AM
> To: Budd Engineering; General pattern discussion
> Subject: Re: [NSRCA-discussion] 10s LiPo Charger Recommendation
>
> Jerry
>
> Hard to beat the iChargers. The CellPros taught me that a fuse between the
> pack & charger is a good investment! No issues with 3010b iChargers  (about
> 3000 charges over 5 years or so). They  will report cell IR / voltage and
> charge a 10S pack at 2C with a 24v supply without breaking a sweat. The
> newer 4010 can handle 2x10S and displays data from both packs
> simultaneously. They don't meet your criteria of charging through the
> balance leads, but haven't really found that to an issue as the balancing
> system works fine. Can't really comment on service, haven't needed any
> (that should jinx me).
>
> Earl
>
> -----Original Message-----
> From: Budd Engineering via NSRCA-discussion
> Sent: Thursday, October 08, 2015 4:59 AM
> To: List NSRCA-list
> Subject: [NSRCA-discussion] 10s LiPo Charger Recommendation
>
> Hi all, I m in need of some advice/suggestions for a new LiPo charger for
> 10s packs.
>
> For the past several years I ve used CellPro-10S chargers with good
> results.
> However recently one of my CellPro-10s' emitted the dreaded  magic smoke
> when I connected a 10s pack for charging.  This also happened at the Nats 3
> years ago, fortunately Mike M. from F3AU was there with inventory and I was
> able to purchase a replacement charger and press on.  However, after having
> a second one give up the ghost a few weeks ago (and after not many charge
> cycles - I don t fly very much), I m interested in exploring other options.
>
>
> To try to add some focus to this here s my search constraints:
>
> 1.  It must be able to charge each cell individually through the balance
> connector, and give me a relative readout of each cell s condition compared
> to the other 9 cells.
>
> 2.  I m not interested in chargers that have separate balancers from the
> charger (e.g. like the TP1010C).
>
> 3.  Reliability and value are important, as is ease of use.
>
> 4.  Cost no more than a replacement CellPro 10XP (<$180), unless a single
> charger can charge two 10s packs simultaneously, then I d consider spending
> a bit more.
>
> 5.  Customer service matters, if I can buy it through F3A Unlimited, that
> would be a PLUS.
>
>
> With this in mind does anyone have a suggestion for what chargers I should
> consider?
>
>
> I don t get out much these days so it s difficult to see what everyone s
> using that works well.  So I really do appreciate everyone s help with
> this.
>
> Thx, Jerry
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>
>
> --
> Vicente "Vince" Bortone
>
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