4mm ec5 connectors

[Mentat]

Do you guys think that 4mm ec5 style connectors are good enough for a Mamba Monster 2200kv on 4s lipo? pushing 100-150 amps? The only reason i am wanting to use someting like this is that im having issues with my 6.5 MM Bullets coming off my Packs and such, any thoughts on that? would Flux help with that problem?

[BL_RV0]

Those are EC3 connectors. I wouldn't use them.

[simplechamp]

Got anything against using Deans?

[Mentat]

deans just do not seem like they can handle many amps, whereas the 6.5mm i use are rated around 200amps or so.

[simplechamp]

Soldered properly a deans plug is pretty much the equivalent resistance as an equal length of 12G wire. What gauge wire is your system running on?

[Mentat]

i have mainly 10awg wiring and one pack that has 8awg on it. Its on reason i run the bullets. Im starting to think maybe its something to do with how i soldered it to begin with. Heat up the Bullet, melt the Solder into the Bullet, Stick the wire in. No tinning of the wire ahead of time may be my issue?

[simplechamp]

It's always a good idea to tin the leads before soldering. If you are having issues with the bullets coming off maybe you are getting cold solder joints.

[Mentat]

whats this colder solder joints? how can i avoid?

[MetalMan]

When I solder 12ga. Wet Noodle wire into 4mm connectors I tin the wire while it's inside the un-tinned connector, effectively tinning both the wire and the connector at the same time. This method requires that the iron stay on longer, but done right it will hold beautifully.

Honestly, I wouldn't trust 4mm connectors over Deans for batteries. If you are using 6.5mm connectors and having issues with them disconnecting, I can imagine it would be worse with 4mm.

I've seen the ec5 connectors on hobbyking. Strange thing is they mention the bullets are 4mm connectors. I use losi ec5 connectors, and believe they are bigger than 4mm. The hobbyking ones are slightly different or the info isn't correct.

[wallot]

hobbyking EC-5 are same as any other EC-5. the description is not correct.

[simplechamp]

Originally Posted by Mentat

whats this colder solder joints? how can i avoid?

A cold solder joint is where the solder does not adhere completely due to lack of heat in the components being soldered (the solder doesn't melt hot enough, hence the "cold"), and doesn't form a strong physical bond or good electrical connection.

Remember, a soldering iron is NOT used to melt the solder. It is used to heat up the components so that they will melt the solder. Using the iron to directly melt the solder will result in many cold solder joints. It is crucial that the components are hot enough to melt the solder to the proper temp.

Cold joints are EXTREMELY poor electrical conductors. A 200+ amp rated bullet connector isn't any good if a cold solder joint will only allow it to conduct 40 amps.

[brushlessboy16]

I have run both deans and ec5, both are nice connectors but deans have the advantage in convenience when you want to run someone elses batteries or something of that nature.


Deans hold up fine.

[rabosi]

On the soldering, don't forget to keep the iron tip clean and tinned also. A damp sponge works great for cleaning.

[jsr]

Deans are rated for 60A to maintain their specs but everyone runs them above that. Above 60A they're lossier and will heat up but work ok. 4mm bullet connectors are rated between 50-75A. I'd say closer to 50 is more accurate. If you absolutely need max performance bigbullets are the way to go but deans are much easier, dummyproof, and common.
If you need soldering help PM me. I'm IPC certified.