Feb 09, 2014, 08:19 PM
Flying = Falling (Slowly)
Tulsa, OK
Joined May 2004
2,374 Posts
Quote:
 Originally Posted by John Lueke 16 gauge wire has twice the resistance per foot as 12 gauge wire, but we are only talking about a foot of wire from battery to esc and back to the battery. The difference between 2 and 4 mili-ohms! It might make a difference in heating if you run high amps for hours, but not for ALES.
While it is likely that the conductors on the "J" packs can work in our applications TP data suggests that the conductors on these packs are 18 gauge and th conductors on the non-"J" packs are 16 gauge. 18 gauge may work, but it is bad practice.

IF A PERSON HAS A CHOICE, there is no reason to purchase the "J" packs.

For anyone contemplating pushing the "J" packs to their 70C rating, you should be mindful that you will be doubling the heat to be dissipated in the conductors. I would not recommend it.

From someone who has blown up a couple of power systems and NOT destroyed any planes yet, I would simply advise to not press your luck.

Happy Landings,

Don
 Feb 09, 2014, 08:52 PM the anthropocebo effect Joined Jan 2007 3,445 Posts 18AWG has a resistance of about 0.0064ohms/ft. So if there is 2x 3" (there and back), the resistance will be 6"/12" x 0.0064ohms/ft = 0.0032 ohms. At 50A current, this will give a voltage drop of about 0.16V in the wires alone. At 555W (11.1V nominal, 50A), there would be about 9W going to heat those two 3" wires. For a 30 second run they will probably survive, but will get quite hot, particularly in a closed fuse with no airflow. If you switch to 16AWG wire (like on the non-JST version of the battery), the resistance of 6" of wire would drop down to 0.001 ohms and give a voltage drop of 0.05V. The watts lost in the wire would be about 2.5W, and the wire temperature would be much lower. Even my cheap 1000mAh 45C Nanotechs have 14AWG wires. Places with the Thunderpower 850mAh without the JST, and with 16AWG wires: https://www.aero-model.com/4_166_212...50-3SPF70.html http://www.rctoys.com/rc-toys-and-pa...BATTERIES.html Kevin
 Feb 09, 2014, 08:54 PM Registered User Miamisburg OH Joined Dec 2003 456 Posts Agree that 18 gauge and JST connectors are a problem. 16 gauge and Deans, not so bad. Sounded like some people were expecting 12 gauge wire.
Feb 09, 2014, 08:59 PM
Registered User
United States, WA, Gig Harbor
Joined Aug 2007
1,651 Posts
Quote:
 Originally Posted by aeajr I have only found the one with the JST connector. Where did you get the others? I do see that there are two listed on the TP website but the Specs are the same except for the plug and I have not seen the one without a plug listed anywhere. In any case the ones from Tower have shipped so I can't stop them. I will take a look at the wire and hope tower's spec is wrong.
Lots of places carry them both as I recall. I have a very slooooow internet connection tonight but try...

http://www.atlantahobby.com/Store/pc...dcategory=1007

or

http://www.rctoys.com/rc-toys-and-pa...LIPO-BATT.html

or ebay or Amazon or Google
 Feb 09, 2014, 09:10 PM Registered User United States, WA, Gig Harbor Joined Aug 2007 1,651 Posts Wow. You're right Ed. Most suppliers I have checked (slooooowly) ONLY carry the JST version! Obviously they dont know what they are doing or dont realize that the JST version has silly leads. Makes me wonder how many other people didnt know there was a difference in the leads and are running the 18 ga version!
 Feb 10, 2014, 11:02 AM WINS - Winch In Nose Sailplane USA, NH Joined Mar 2008 2,950 Posts This thread, while interesting, has gone pretty far off topic. Please return.
 Feb 13, 2014, 06:02 PM Registered User Brazil, MG, Belo Horizonte Joined Oct 2006 453 Posts Reisenauer This one is great for very light versions. http://www.reisenauer.de/artikeldetails.php5?aid=1623 If you have 2 servos on the tail. then go for this one. http://www.reisenauer.de/artikeldetails.php5?aid=1594 Very very powerfull I still have both and will not sell them, 100% recomended! Enjoy! André
Feb 13, 2014, 06:21 PM
WINS - Winch In Nose Sailplane
USA, NH
Joined Mar 2008
2,950 Posts
Quote:
 Originally Posted by Jebera This one is great for very light versions. http://www.reisenauer.de/artikeldetails.php5?aid=1623 If you have 2 servos on the tail. then go for this one. http://www.reisenauer.de/artikeldetails.php5?aid=1594 Very very powerfull I still have both and will not sell them, 100% recomended! Enjoy! André
Andre, have you fit either of these in the E-Supra Pro? I worry about those wires coming out the side. It's pretty narrow in there. Thanks.

Preston
Feb 17, 2014, 07:37 PM
Registered User
Brazil, MG, Belo Horizonte
Joined Oct 2006
453 Posts
Quote:
 Originally Posted by jaizon Andre, have you fit either of these in the E-Supra Pro? I worry about those wires coming out the side. It's pretty narrow in there. Thanks. Preston
Preston,

Now I have my fat boy (Peggy Pepper 2524) on my Pike Perfect and it's very comfortable, still have 10mm space between the outrunner and the leads.

The skinny guy (PP 2221) is far easier, "will fit a DLG fuse".

As protection I wrap the cables with Kevlar and then Kapton tape, 4 layers is fine.

You can also hot glue the cables on the bottom of the fuse, just keep on mind you have to protect the cables.

André
 Feb 18, 2014, 02:40 PM Registered User Joined Oct 2006 28 Posts seen this? http://www.rc-network.de/forum/showt...t=peggy+pepper message nr 37 with pictures by Reisenauer himself. Did it this way, simple and effective. Jan
 Feb 18, 2014, 04:29 PM Registered User LI, New York, USA Joined Mar 2003 23,214 Posts OK well I received the packs with the JST connectors. I am going to look at whether I can find a way to change the wire or add to it. I did exchange an e-mail with ThunderPower. They confirmed that they have two packs and there are two different size wires on them, but they don't list that in the specs. I told them that they should. I would have preferred to buy the pack with the thicker wire. It's always something.
Feb 19, 2014, 10:07 AM
WINS - Winch In Nose Sailplane
USA, NH
Joined Mar 2008
2,950 Posts
Quote:
 Originally Posted by aeajr OK well I received the packs with the JST connectors. I am going to look at whether I can find a way to change the wire or add to it. I did exchange an e-mail with ThunderPower. They confirmed that they have two packs and there are two different size wires on them, but they don't list that in the specs. I told them that they should. I would have preferred to buy the pack with the thicker wire. It's always something.
All this good information about battery wires is not reaching the wide audience it deserves. Might I suggest starting a new thread that that actually points to this subject and will undoubtedly benefit so many more out there.

Preston