Cap banks - the pre-emptive answer

[ray schrauwen]

Yeah, you are right Wayne. I screwed up.

I have all the stuff to etch pc boards, should have done it in the first place, lazy, tsk tsk...

[drwayne]

Hmm

Yes, these FC labeled boards are a nice 'off shelf' item sourced from China.
The final connection from those boards to leads is via a 5mm solder pad... on 0.5mmX6.35 tracks.

Say a 6S setup.. some 22VDC with an expectation of some 250A peak .. ~5500W
Say an induced ripple of 2.2VAC = ~550W of heating..
Say 6S 1800Kv = 39600rpm = 118800hz ripple.
I say stand back !

This thread was initiated to circumvent people using rtr/offshelf fix-all solutions to our ever increasing demand for power and supply stability... without understanding the potentials and demands involved in their pursuits.
I applaud your enjoyment of the FC product.
Sadly they do not cater all needs presented at this forum.
cheers !

[drwayne]

Yeah, you are right Wayne. I screwed up.

I have all the stuff to etch pc boards, should have done it in the first place, lazy, tsk tsk...

Creating your own circuits is an admirable talent, but the tracking would need be 1/16 to support the currents expected here.
Look at post#12 for an alternative method to what you intend to lay up.
W

[millzee]

Hey Doc, how ya been?
I'm hoping you can reassure me that this wiring will be ok for my 10s set up

[viper1]

Hey Doc, how ya been?
I'm hoping you can reassure me that this wiring will be ok for my 10s set up

[drwayne]

Hi Danny. long time !
1) the soldering of join at 2xESC join with the 14AWG cap leads is poor
2) what capacity the bank & what type the caps ?
3) I do approve the ESC and plugs on ends those leads

W

[millzee]

It's the large Etti cap bank. Should I use thicker wire to the cap bank or is the 14awg enough if I resolder the join with a 400 degree iron and make sure they don't move when cooling?

[drwayne]

It's the large Etti cap bank. Should I use thicker wire to the cap bank or is the 14awg enough if I resolder the join with a 400 degree iron and make sure they don't move when cooling?

The Etti bank is 50V ?? uf
Yes, the soldering iron ( or technique ) needs to be better than what was used originally.. I use an Iroda 300W gas pistol grip thing that does a damn fine job.. be careful the heat doesnt travel up the wires into the esc or you'll roast it !
Although solder is a good conductor, it has limited tolerance to high current flow ( and residual heat build up ) .. more wire to wire contact at that joint is a must .. the 14AWG wires to cap bank suggests it is not capable to feed the quad 8AWG inputs to the esc....

If outside your comfort zone, mate ... post it over... I'll fix
cheers.
DocW

[ray schrauwen]

2) what capacity the bank & what type the caps ?

W

This Etti Cap Bank has a total of 5000 uF ( 5 x 1000uF) They are Rubycon RX30 63V 130*F caps.

[millzee]

thanks ray, my internet crashed for a bit there

[millzee]

How's this, I used a 8mm bullet that I squashed a little to fit both the esc wires into and up the cap bank wire to 10awg.

[drwayne]

-Much better than before.
-Novel approach to joining the 2x esc leads
-The 8mm female would have accepted the 2xESC leads and the cap lead simultaneously .. ..a bit awkward now for heatshrinking.. that's an observation.
- The cable length from 8mmF join to the final male plug looks long.. does it need all that length ?,, shorter leads allow higher current flow ..

Looks promising, mate !

[millzee]

Cheers mate. The leads need to be that long to fit where they're needed. I've put it all together and programmed the esc so I now have another boat ready to run that'll have to wait a week or so due to work commitments. (I've been stuck in the office for a couple of days and that's been a great help catching up on unfinished projects)

[Steven Vaccaro]

excellent idea on the connector.

[rickwess]

This is by far the best method I have seen (courtesy of Doug). I had built a beautiful set of T connectors out of bullets for my 2p setup then had a "V8 moment" when I saw the pic. The gauge of wire wrap is unimportant.....the thinner the better to get a tight wrap. I'm using 22 or 24awg CAT6 wire. It's really just a binder until you solder it.

Easy to shrink wrap too.

Hydra240 parallel 006.jpg