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Connectors for 8AWG wire?
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bonzo View Drop Down
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Posts: 5 		  Quote bonzo Quote  Post ReplyReply Direct Link To This Post Topic: Connectors for 8AWG wire?
    Posted: 11/Feb/2010 at 3:57am
Some turnigy lipos come with 8awg wire.
I've soldered Deans to this lipos but the wire is massive for such a small welding surface of the connector.
I'd like to ask what would be an ideal connector, ec5? ec3? ec3 seems a good option but I don't know if the 3.5mm bullet will fit such a wide wire.
I'd like to use connectors that are fool proof, so bananas are not an option.
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Posts: 25 		  Quote _BEN_ Quote  Post ReplyReply Direct Link To This Post Posted: 12/Feb/2010 at 3:09am
I had a hell of a time soldering 10awg to a deans connector. I couldn't imagine 8wg.

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bonzo View Drop Down
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Posts: 5 		  Quote bonzo Quote  Post ReplyReply Direct Link To This Post Posted: 12/Feb/2010 at 3:47am
That's why I ask! :-)
I just want to know if EC3 would be enough or if I should go for Ec5...
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Posts: 859 		  Quote AmmoJammo Quote  Post ReplyReply Direct Link To This Post Posted: 12/Feb/2010 at 3:47am
the EC5's will take 8ga, EC3 won't even fit 10ga properly.

the EC5's seem reasonable, but sometimes they can be pretty tight to unplug.

10ga cable fits on deans just fine.
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Posts: 859 		  Quote AmmoJammo Quote  Post ReplyReply Direct Link To This Post Posted: 16/Feb/2010 at 3:47am
an update for anyone who cares.

I attempted to solder 12ga cable to some EC3 plugs,

the conductors fitted in the bullet just fine, but I was unable to insert the bullet into the housing, as I couldn't apply enough pressure without simply mashing the cable, and the insulation was the same size as the end of the bullet, so I couldn't use a small screw driver to push it in.

I went back to crappy deans!
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Posts: 25 		  Quote _BEN_ Quote  Post ReplyReply Direct Link To This Post Posted: 19/Feb/2010 at 2:31am
@AmmoJammo: Nice job with the deans connectors.  I'm too worried about melting the plastic. I have ruined a couple connectors in the past because I couldn't get the heat to soak into the wire fast enough. 

FYI:
A buddy of mine just got some zippy packs(5000mAh 2s 40c) that have 8ga wire on them. I soldered the wires to some Traxxas style connectors and the wire fit perfectly. The 8ga wires insulation fits perfectly inside the traxxas connector. If the insulation was any larger it wouldn't fit.   
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Posts: 119 		  Quote rewolff Quote  Post ReplyReply Direct Link To This Post Posted: 22/Feb/2010 at 6:54pm
If I remember correctly the deans connectors are rated at 80A. 5Ah, 40C means 200A.

I measured the contact resistance of a deans connector at 0.3 mOhm(*). At 100A that's 30mV, and 3W (6W for the whole connector!). That's too much for such a small connector. It will desolder the connections, melt through isolation tape etc etc.

So if you are able to restrict yourself to say 16C, and stay under 80A, then Deans might still be the way to go....


(*) I'm a bit stupid. I didn't write it down. It may have been 3mOhm, but that would mean 30W at 100A. That would fry it immediately. I don't think it's that bad... :-)
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Posts: 859 		  Quote AmmoJammo Quote  Post ReplyReply Direct Link To This Post Posted: 23/Feb/2010 at 3:35am
I ended up just using 5.5mm bullets:

http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=9763

I really wasn't happy with anything else, and I'm still not happy with these either!

but, they seemed like the best of a bad bunch.
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Posts: 5 		  Quote bonzo Quote  Post ReplyReply Direct Link To This Post Posted: 25/Feb/2010 at 12:52am
Originally posted by AmmoJammo

an update for anyone who cares.

I attempted to solder 12ga cable to some EC3 plugs,

the conductors fitted in the bullet just fine, but I was unable to insert the bullet into the housing, as I couldn't apply enough pressure without simply mashing the cable, and the insulation was the same size as the end of the bullet, so I couldn't use a small screw driver to push it in.

I went back to crappy deans!

Search the net, there are videos that show that you ahve to push the bullet with a small screwdriver into the housing.
I've ordered EC-5 and a few lipos, as soon as I get them (they are backordered) and I solder them, I'll post the result.
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Posts: 859 		  Quote AmmoJammo Quote  Post ReplyReply Direct Link To This Post Posted: 25/Feb/2010 at 3:35am
Originally posted by bonzo


Search the net, there are videos that show that you ahve to push the bullet with a small screwdriver into the housing.
I've ordered EC-5 and a few lipos, as soon as I get them (they are backordered) and I solder them, I'll post the result.


the insulation on the 12ga cable was slightly bigger than the outside of the bullet on the EC3 connectors.

therefore.

there was nothing to push the screwdriver on! :)
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