RE: Ignitions on A123 Cells??  
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RE: Ignitions on A123 Cells?? - 12/9/2007 7:06:26 AM   
SinCityJets


 

Posts: 812
Joined: 11/13/2005
From: Henderson, NV, USA
Status: offline
quote:

ORIGINAL: craigteffe

What chargers are avaliable for the A123 packs? Will the acucycle work? Or do we need to purchase another charger?



Craig, you have to decide if you are going to balance charge or not. If you are going to balance charge, the best charger out right now is the FMA CellPro 4S. If you are NOT going to balance charge, then you can use any nicad capable charger as long as you use a "Dapter." You can find a Dapter at SLK Electronics, or maybe even at the website in my signature. The dapter allows you to charge 1 A123 cell for every 2.5 nicad cells your charger will handle. The dapter can handle up to an 8amp charge, so the charge rate will depend on your charger's capabilities.

Having said all that, if you are still undecided on balance charging, or not; most information and research out shows these cells do NOT need to be balanced, like their Lipo cousins. Especially in 2S-6S configurations. While it certainly isn't going to hurt to balance them, you might as well save yourself an extra $5 per battery.

< Message edited by SinCityJets -- 12/9/2007 3:24:29 PM >

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RE: Ignitions on A123 Cells?? - 12/9/2007 11:54:31 PM   
Richard D Bahmann aka/Wrongway



Posts: 2014
Joined: 1/7/2004
From: Ormond Beach, FL, USA
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quote:

ORIGINAL: Josey Wales

1--Yes Im using a JRHD DSC Switch
2--Yes the Cellpro comes with a pigtail and you solder on the connection you want to use
3--Yes
4--Yes-the plug will get warm but it works fine
5--All I did was snip off the stock wires up to the tab and soldered my own wires right on top. The white signal wire was soldered to the existing taps that came with the packs. I didnt add any extra bars. I left the cardboard sleeves on and ca's them together like I did with the 2300 A123's.



So Joe, are you charging through the switch or direct to the battery? I decided to do one A123 2300 two cell on my 35 % and will likely recharge after each flight until I get a track record going.

I wory about how many amps you can send through a switch....say smart fly type witout damaging it. Sure would be nice to not have to cut the canopy loose each flight.

RDB

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       Post #: 177

RE: Ignitions on A123 Cells?? - 12/9/2007 11:58:04 PM   
Josey Wales



Posts: 4668
Joined: 7/27/2003
From: **, NJ, USA
Status: offline 		I charge direct through the switch with the Cellpro--been doing it that way all summer with the JR switches.

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       Post #: 178

RE: Ignitions on A123 Cells?? - 12/10/2007 12:02:37 AM   
Bob Pastorello



Posts: 5214
Joined: 2/23/2002
From: El Reno, OK, USA
Status: offline 		Rich - if this is any help.... I have three airplanes, using Hitec 5955's on ail (2), elev (2) rudd (1) and a Hitec 5625 or something like it for throttle on all three. Average current per flight is about 265-340 ma, depending on throttle setting, how crazy, etc. These are average of 8-10 min. flights.

BTW - what I do is keep track of radio "on" time at the flying field per session....then watch the Cell Pro tell me how much current it has to put back, and I go all the way through peak, just to be consistent.

I use dual switches just to provide redundant paths; each is rated at 5A DC, I believe, they are the Maxx Products Heavy Duty charge switch.

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       Post #: 179

RE: Ignitions on A123 Cells?? - 12/10/2007 12:19:36 AM   
Richard D Bahmann aka/Wrongway



Posts: 2014
Joined: 1/7/2004
From: Ormond Beach, FL, USA
Status: offline 		Thanks guys, so I keep the amps down to say 3 or so?

I am only using the one Smart Fly fail safe switch to take the 18 g deans to the power expander in the 35%.

On my EF-88 I did my 2 cell A123 at 5 amps after a day of flying and put 699 mAh back in in 10 minutes flat.......before I could break down and put it in the trailer, done! That was after about 5 flights at 10 or more minutes each. Cool stuff.

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       Post #: 180

RE: Ignitions on A123 Cells?? - 12/10/2007 5:21:58 AM   
rctom



Posts: 5150
Joined: 5/8/2002
From: Flower Mound (near Dallas), TX, USA
Status: offline 		It's surprising how little power a 50cc size plane actually uses. People have been massively overpowering them.

BTW I skipped over 8 pages of posts. Are we still talking about A123 on ignitions?

TF
       Post #: 181

RE: Ignitions on A123 Cells?? - 12/10/2007 1:43:44 PM   
dick Hanson



Posts: 9930
Joined: 12/12/2001
From: slc, UT, USA
Status: offline 		If 2.5 ounces means the world to you - get a pair of VPXcells for ignition -1100ma (2.5 oz all ready to go ) .
on any single cyl -this is plenty for a day
on twins -depends on how many flights and rpm of engine !
Add diodes if you have 4.8 ONLY type ignitions - be sure to get large diodes .
many advanced type ignitions (with multiple functions uch as included tach,auto cutof etc., like a full sip of power for each cycle -
Do NOT starve the ignition module .
you could kill it.

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       Post #: 182

RE: Ignitions on A123 Cells?? - 12/10/2007 8:26:48 PM   
craigteffe



Posts: 456
Joined: 2/7/2003
From: Maryville, TN, USA
Status: offline 		What solider are you guys using to build your own packs, and are you using the tabs that are already on the packs?

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       Post #: 183

RE: Ignitions on A123 Cells?? - 12/10/2007 9:36:50 PM   
Bob Pastorello



Posts: 5214
Joined: 2/23/2002
From: El Reno, OK, USA
Status: offline 		REgular rosin-core electronics solder
Yes

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       Post #: 184

RE: Ignitions on A123 Cells?? - 12/11/2007 12:58:57 AM   
nonstoprc



Posts: 1027
Joined: 9/9/2003
From: austin, TX, USA
Status: offline 		I am on my way to pick up two packs of VPX to build two packs for my gas pattern. The total weight saving over two nicad packs is worthy every dollar!

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       Post #: 185

RE: Ignitions on A123 Cells?? - 12/11/2007 1:02:20 AM   
Bob Pastorello



Posts: 5214
Joined: 2/23/2002
From: El Reno, OK, USA
Status: offline 		Yep.
Sure is.

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       Post #: 186

RE: Ignitions on A123 Cells?? - 12/19/2007 5:08:39 AM   
vettebob


 

Posts: 31
Joined: 11/26/2005
From: Blue Springs, MO, USA
Status: offline 		I have a Rcxcel red label with a ver 2 sticker on it I wired 1 5402 diode in series. Is this going to be acceptable 0ver the long term? Thanks Bob

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       Post #: 187

RE: Ignitions on A123 Cells?? - 12/19/2007 11:12:10 AM   
Bob Pastorello



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Joined: 2/23/2002
From: El Reno, OK, USA
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quote:

ORIGINAL: vettebob

I have a Rcxcel red label with a ver 2 sticker on it I wired 1 5402 diode in series. Is this going to be acceptable 0ver the long term? Thanks Bob


Sounds like it should be fine. That's consistent with the Rc Ecxell instructions, so I can't see what problem there would be.

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RE: Ignitions on A123 Cells?? - 12/20/2007 4:04:15 PM   
3D_Junkie


 

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Joined: 5/2/2007
From: League City, TX, USA
Status: offline
quote:

ORIGINAL: vettebob

I have a Rcxcel red label with a ver 2 sticker on it I wired 1 5402 diode in series. Is this going to be acceptable 0ver the long term? Thanks Bob


I looked up the 5402 diode, I don't think the voltage drop you get will be enough since it uses a metal semiconductor.

http://www.secomtel.com/UpFilesPDF/PDF/Agilent/PDF_DOCS/SKYDIODE/03_SKYDI/59682349.PDF

I would go with a 1N4001 Rectifier diode. They are rated at 1A and will drop the voltage ~0.7V because it is made of silicone.

http://www.onsemi.com/pub/Collateral/1n4001rev5dx.pdf

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