High C rating Nano's desoldering my wires.

[maxmekker]

I have been running my 2S 4500 45-90 C packs for a while now, and my serial cables and soldering in general are holding just up fine. ( 1 year)
T180 - Leo 4074 2000kv M445 prop.temps all over are cool (plugs motor caps lipos etc)

Then I got my 65-130c pack's and on the first run , one of the solderings on the ec5 came off. They are smoking hot , between battery and serial cable , to hot to hold in you're finger tips. The rest is at a normal temp as they are with the 45-90c packs.

I had a spare one lying , so I charged and made 3 runs with the pack's I have with 45-90c, and then on the last run, with the 65-130c pack , right towards the end , (3,6v left) one of the soldering came off again.

Last night I made some neew ones with 10 awg (instead of the ones I had with 12) and will test today.

I'm just wondering if that is the case, 12 vs 10 awg size ?

thanks for looking

[Chilli]

The new, higher C rating packs are allowing your motor to draw more current. It's time to ditch the EC5's and go to larger bullets.

[jamespl]

I've invested in some hobbyking 6mm connectors. I'm yet to change everything over though. My ec5's run mega hot using an m445 on a 4074 2000kv motor with a T-180. That's with 60c 7.4's in series

[motorfixer1]

I've invested in some hobbyking 6mm connectors. I'm yet to change everything over though. My ec5's run mega hot using an m445 on a 4074 2000kv motor with a T-180. That's with 60c 7.4's in series

I have purchased the 6mm and 5.5mm polymax bullets from hobbyking and I will say the 6mm ones are really hard to plug in and out. So much so that I only use them for the esc/motor connections. The 5.5mm bullets are much easier to connect and disconnect so are my first choice for the batteries.

As the amperage capabilities of the batteries increases so should the connectors and switchgear. I have ran the HK deans style connectors on my genesis with a t180 on 6s2p, leo 4082 1800kv, x445 and they never came unsoldered or got too hot to touch. The possibility of a cold solder joint may be the cause of your problems or a defective connector.

[jamespl]

Are they these 6mm ones you use? That's what I've ordered. http://www.hobbyking.com/hobbyking/s...%5Fset%5F.html or are they just the 6mm bullets? I use 6mm bullets on the motor/esc and they are really hard to get apart.

[maxmekker]

Thanks guy's. I'm off to test now, with my new Leo 4074 2150 kv. Just installed it. Let you know how it went.

[Ken Haines]

Just a simple racing tip.
Solder your connections lightly tinned with your normal 60/40 solder.
Then complete the task using silver solder. 3% is probably the easiest type
to work with. That will increase your melting temp approximately 50 to 100 degrees.
You should find a lot less melting on all of your connectors. You still may have to increase
the connector sizes, but this can buy you some margin. I use all 5.5mm for the batteries.
And either 5.5's or 8mm on the motor leads for the higher current set-ups.
Hope this helped.
Ken

[maxmekker]

Hmm, nice tip. I'll see if it holds up now . Post back later

[motorfixer1]

Are they these 6mm ones you use? That's what I've ordered. http://www.hobbyking.com/hobbyking/s...%5Fset%5F.html or are they just the 6mm bullets? I use 6mm bullets on the motor/esc and they are really hard to get apart.

I bought the individual 6mm bullets not the ones with the protectors. The ones you bought look much nicer than the ones I got.

[maxmekker]

This is how things went today.

Mystic was flying with the 2150 kv, all stuff just fingerwarm. T180 at timing 11 with x442 and 642 prop 4500 2x 2s 45-90C. In the video he is only opening up in small burst's, no flat out .

Geico, it was like something was holding it back, could not get up to speed and the serial connection got smoking hot , motor caps ecs lipos was at normal temps ( temp mes. was out of battery, so no figures) This was with the 45-90c lipos
In the video I'm going flat out most of the time.

And with the 65-130 it went again. same wire as the last 3 times, red one, and the packs is at same V as the last times to. 3,69v.

So maybe I need to pull it appart, ore test with a new ESC, maybe it's broken , ore halting, not sure what to make of it right now.

Flex was pulled out before today's run and greased. New motor, so I checked that everything was working fine and spinning free. Timing is at 11, (T180) my 4074 2000kv motor. But the boat was like it was 10 times heavier in the water than the Mystic.

Video coming soon.

[Rumdog]

get some real 5.5mm bullets. No crappy series connector harness needed. You have too much resistance. That's why the heat.
Also, no matter the packs c rating, the motor will only draw the amperage designated by the setup. (motor kv, voltage, prop, prop depth, and drag) The extra amperage will not just dump into the motor/esc just because it's available.

[Chilli]

Also, no matter the packs c rating, the motor will only draw the amperage designated by the setup. (motor kv, voltage, prop, prop depth, and drag) The extra amperage will not just dump into the motor/esc just because it's available.

If your set up is pushing overrated, old, low quality packs the set up will only draw what the batteries can give you. In a conservative set up with fresh, good quality packs there should not be a significan difference in current draw between 45C and 65C .


Like Rummie said, Go with 5.5 bullets and ditch the extra connectors. Your controller and batteries will also be happier with 4S2P if it will fit in your boat. Easier on the packs and less ripple current for the controller.

[maxmekker]

Video from today

[Brushless55]

This is how things went today.

Mystic was flying with the 2150 kv, all stuff just fingerwarm. T180 at timing 11 with x442 and 642 prop 4500 2x 2s 45-90C. In the video he is only opening up in small burst's, no flat out .

Geico, it was like something was holding it back, could not get up to speed and the serial connection got smoking hot , motor caps ecs lipos was at normal temps ( temp mes. was out of battery, so no figures) This was with the 45-90c lipos
In the video I'm going flat out most of the time.

And with the 65-130 it went again. same wire as the last 3 times, red one, and the packs is at same V as the last times to. 3,69v.

So maybe I need to pull it appart, ore test with a new ESC, maybe it's broken , ore halting, not sure what to make of it right now.

Flex was pulled out before today's run and greased. New motor, so I checked that everything was working fine and spinning free. Timing is at 11, (T180) my 4074 2000kv motor. But the boat was like it was 10 times heavier in the water than the Mystic.

Video coming soon.

letting your packs goto 3.69v per cell they are about empty
can be hard on the packs...

[maxmekker]

Today I got some silver solder. Changed the melted ec5 and will try again later today.

It seems like it's the + side , were the ECS meets the serial cable , it's there it have desolder from every time.