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Apr 06, 2020, 04:20 PM
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Question

Does anyone still use bullet connectors?


Several years ago it was common for people to use plain bullet connectors covered with heat shrink tubing on LiPo batteries. Usually one male connector on one wire and one female on the other wire. Most people including myself have standardized on something like XT90 or EC5 connectors for large batteries.

I have several large models that use 12S setups, and I am trying to clean up the wiring inside the fuselage. I am considering using the bullet method because I can connect two 6S packs to make a 12S pack really easily. My only concern is safety since the connectors are not covered by a plastic housing, and there is a greater possibility for a short.


Anyone still use this method and have some experience?
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Apr 06, 2020, 04:23 PM
Registered User
I've never done it and will never do it. IMHO it's an accident waiting to happen, but I still see a lot of people doing it that way.
Apr 06, 2020, 04:49 PM
What would lonelasso do?
jfv61's Avatar
Saw a friend get pretty badly burned years ago because it's too easy to get wrong. I was using Dean's back then, I use XT90 for my big batteries now.
Apr 06, 2020, 05:09 PM
EDF all the way!
bruff's Avatar
I use XT150 bullet connectors on all my batteries. make 12S easy to setup.
See here.
Bob
Apr 06, 2020, 05:52 PM
Registered User
NOTHING is fool proof because there are just too many fools.

Bullet connectors are a great way to do it as long as the person using them isn't a fool.
Apr 06, 2020, 06:57 PM
Registered User
For myself personally, I would avoid examples with "bi-gender" bullets where batteries or sub-packs can easily get shorted, plugged in series with each other when the user meant a parallel configuration.

Obviously in theory this is possible with Anderson PowerPoles, except if you aren't an idiot, so easy to proof against that.

6mm even 8mm bullets now, can caryy huge ampacity.
Apr 06, 2020, 07:40 PM
Registered User
4 new ESC have the small bullets. The motor also has bullets. Nice to get rotation right.

Who makes a molded 3 pin XT 90 M & Female ? No polarity needed or wanted to reverse motor rotation.
Apr 06, 2020, 11:45 PM
Retired Electronics Specialist
vollrathd's Avatar
Quote:
Originally Posted by cyclops2
4 new ESC have the small bullets. The motor also has bullets. Nice to get rotation right.

Who makes a molded 3 pin XT 90 M & Female ? No polarity needed or wanted to reverse motor rotation.
They are rather big, but those Anderson Power Pole connectors can be stacked to as many connectors as needed. But, stacking more than three or four makes the connector rather hard to unplug.
Apr 07, 2020, 04:12 AM
Registered User
They make pull handles help with that
Apr 07, 2020, 04:59 AM
Registered User
I use bullet connectors for all my high current/voltage applications.

As you said, it's the easiest way to connect your packs in series and there are only few connectors with plastic housing out there which can handle high currents. Moreover it's very easy to build a anti spark circuit with bullet connectors, which is an important point when running high voltages.

So for me there is nothing wrong with bullet connectors. Of course, you have to be careful when plugging everthing together, but things can go wrong with "failsafe" connectors, too.
E.g. mismatching a parallel and a series harness, etc.
Apr 07, 2020, 07:28 AM
Registered User

Big 200 amp battery connectors are what I used on my generator


I bolted 2 together to make a cabled power cord. It is fist size. Has been used many times.

NEVER EVER pull apart plugs with any current flowing in the circuit. It DOES DOES cause a arc to melt a tiny spot that can ruin the smooth flat surfaces for ever. I have done that in large industrial systems.

The 2 plugs are stacked & bolted . No way they can cause a short circuit. Tested that.
Apr 08, 2020, 10:35 AM
Registered User
pilotpete2's Avatar
Quote:
Originally Posted by Treeline
NOTHING is fool proof because there are just too many fools.

Bullet connectors are a great way to do it as long as the person using them isn't a fool.
Proverbs 16:18
Pete


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