Are Deans enough?

[BrianG]

Yeah, the 30A rating is most probably "continuous", which hardly any of us do.

[florianz]

honestly, I don't believe what they write. after I've read that countless mgm's going up in smoke w/out a reason, that article sounds funny...

the link I've posted before (http://www.elektromodellflug.de/hoch...romstecker.htm), this guy has tested different plugs. his tests on lipo batteries are of good standing here in germany. he is also writing for magazines.

but anyways, this guy has tested the deans ultra plugs, they have a resistance less then <0,3 mOhm, and they can handle 60A continous / 75A for 30s peaks. so I think they're quite ok. even good chinese copies should be ok, as long as they're not too hot after use.

more and more boat guys use 8 mm bullet connectors, they have higher permanent currents then cars. sure an 8mm connector can handle a lot, but that's not very handy, I think.

there is a certain way to avoid the sparks when connecting the batteries, can't remember exactly. Ive just orderd some new deans, after more then two years of use they're worn out and oxidised.

those eflite ec5-connectors look quite good.

[florianz]

off-topic:

I wanted to "spice up" the cable & plugs of the motor, and I thought, well, I try 5,5mm bullet plugs. sh****t, the're massive



harr harr, that should be sufficient... w/ the original cables of the esc, the cables got quite warm after hard bashing. So I took 4mm cables, and it got less warm. I think w/ those 5,5mm plugs and the 6 mm² cables (between 9 and 10 awg) I should be on the safe side

I have the esc placed above the steering servo to have more weight on the front end (better steering, less wheelies etc.), so a bigger diameter makes sense.

flo
(aka Mr. Frankenstein)

On MGM's site you can see how to "no-spark" when you're gonna connect your deans or w/e.

Hmmm, on MGM's site deans are designed for up to 30A continious, and on that german website they're for 70A. But that still wouldn't be enough for my LST conversion with my bigmaxx? I'm getting a bit scaried

[Sammus]

I use both deans (6s MMM 2200 combo in a savage XL) and 4mm bullets (6s MMM feigao 11xl in e-revo). Neither of them heat up noticeably above ambient. The feigao motor gets hot, the MMM 2200 motor rarely gets above ambient. Both trucks geared to about 45mph according to briang's calc.

[florianz]

Originally Posted by Byte

On MGM's site you can see how to "no-spark" when you're gonna connect your deans or w/e.

Hmmm, on MGM's site deans are designed for up to 30A continious, and on that german website they're for 70A. But that still wouldn't be enough for my LST conversion with my bigmaxx? I'm getting a bit scaried

thanks for the "no-sparks" hint. that german guy doesn't get any money for his tests, so I would trust that results. at least it shows more/less how capable different plugs are.

at hk they have some nice 8mm plugs. I don't know if that's too much. they're not quite convenient...

very interesting topic. when people invest 100's $ in excellent electronics, it's also important to think about plugs, wires etc, and if there are any weak spots.

Originally Posted by florianz

thanks for the "no-sparks" hint. that german guy doesn't get any money for his tests, so I would trust that results. at least it shows more/less how capable different plugs are.

at hk they have some nice 8mm plugs. I don't know if that's too much. they're not quite convenient...

very interesting topic. when people invest 100's $ in excellent electronics, it's also important to think about plugs, wires etc, and if there are any weak spots.

I ordered some 5.5mm plugs from Hobbycity. But they weren't that cheap; 12 dollar for 10 pair.

But MGM says that because of low-current connectors ESC's can go into fire. Well, when I started this hobby I had a 10 turns brushed + LRP brushed ESC. I used Tamiya connectors, and they melted three times, but to the motor or ESC nothing happened? Can anybody explain this? Or was it just lucky me?

[florianz]

I melted my plugs as well... but the esc survived. it was a lrp irc/ics controller, I think one of the best and most solid bushed esc's EVER. great stuff. any other might have burned. but I think it killed the motor. I think it burns there where the weakest point is.

[MetalMan]

Originally Posted by Byte

But MGM says that because of low-current connectors ESC's can go into fire. Well, when I started this hobby I had a 10 turns brushed + LRP brushed ESC. I used Tamiya connectors, and they melted three times, but to the motor or ESC nothing happened? Can anybody explain this? Or was it just lucky me?

Comparing brushed and brushless is like comparing apples and oranges (sort of...). Brushless ESCs do all the commutation, brushed motors do the commutation. Brushed ESCs do a lot less work than brushless ones, which is why brushless ESCs in brushed mode can handle so much current.

There's a lot more to go wrong with a brushless ESC, especially a sensorless one. If a rotor locked up on a brushed motor it might just fry the commutator or brushes, but in brushless there is no weak link like that.