Help needed problem with hot connectors

[MarkF]

Bigum

The connectors from esc to batteries see more amps than the ones between motor and esc. So if your melting the shrink from motor to esc then you probably have a cold solder joint. I am very good at soldering myself but sometimes I get a cold joint and don't know it until I run the boat. Your set up sounds reasonable for a rigger but your packs are going to be the week link. Buy some better packs. Also soldering esc direct to motor is a good way to go.

Mark

[photohoward1]

Oops!

2390kv x 14.8v= 35,372rpm......am i missing something? He's running 4s, not 6s. I still agree that almost a 10k rpm drop loaded is not good. But what do i know?

[kfxguy]

Oops!

Lol! It happens!

[kevinpratt823]

Bigum

The connectors from esc to batteries see more amps than the ones between motor and esc. So if your melting the shrink from motor to esc then you probably have a cold solder joint. I am very good at soldering myself but sometimes I get a cold joint and don't know it until I run the boat. Your set up sounds reasonable for a rigger but your packs are going to be the week link. Buy some better packs. Also soldering esc direct to motor is a good way to go.

Mark

I'm not sure I agree 100% here, in every boat I have the motor bullets seem to get considerably hotter than batt bullets.

[MarkF]

Good point Kevin

That's because your hot motor is getting the bullets hot. Not because the motor draws more amps from there. This is one reason we use to solder our esc to motor. Adding bigger bullets is just a band aide on a bad set up. The bullets between battery and esc see more amps. My motor bullets don't get hot unless something like a bad solder joint happens or my motor is going bad and gets real hot. A bad set up like running to big a prop for to long will do this but I don't think his set up is bad for a rigger. I have melted plenty of shrink on my battery bullets but very rare on my motor bullets. And I don't run mild set ups:)

Mark

Mark

[kevinpratt823]

I would think the higher temps on motor bullets also has something to do with the rapid pulses and changes in polarity the esc puts through the motor wires, also I thought they actually peak higher than the more steady draw from the batts, which is evened out a bit by capacitors.

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[Bigum]

Bigum

The connectors from esc to batteries see more amps than the ones between motor and esc. So if your melting the shrink from motor to esc then you probably have a cold solder joint. I am very good at soldering myself but sometimes I get a cold joint and don't know it until I run the boat. Your set up sounds reasonable for a rigger but your packs are going to be the week link. Buy some better packs. Also soldering esc direct to motor is a good way to go.

Mark

Thanks Mark yeah it looks like the batteries isn't so happy With that current, must be a upgrade, Was also thinking soldering esc direct to motor seam like god idea

[jkr]

Soldering the wires direct to the motor is the best you can do for start.

[kevinpratt823]

Soldering the wires direct to the motor is the best you can do for start.

How exactly are you guys going about this, especially if the motor leads are part of the windings? Just stack together and solder?

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[jkr]

How exactly are you guys going about this, especially if the motor leads are part of the windings? Just stack together and solder?

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Yes
I solder the wires of the esc directly on the motor wires and if i have the space i may also solder them direct on the pcb.

[montymike]

Get rid of those zippy batts...get revoletric batteries zippys have screwed up more then 1 of my escs they are ok
On small setups but there c reading is misleading.Ditch the zippys...