How much resistance / loss is created by using too many XT90 connectors


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B8rez 2g4

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Jun 21, 2021
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For example , if you had 4 battery packs
Then joined them all together with XT90's (4 X Female) to (1 X Male) output then to the load
Essentially a 4 to 1 adapter
Is the loss of any significance ?
 

hbpowerwall

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Oct 7, 2016
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I wouldn't expect any at low draws - if there was you'd be hard-pressed to notice anything.. If you had a thermal camera that would be a quick way to visually see the losses. High loads for sure there would be some sort of losses
 

B8rez 2g4

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Jun 21, 2021
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Hey thanks for your reply HBPowerwall.

My new motor draws 42 Amps max . When back EMF kicks in it draws much less.

Would you consider that a high load
 

hbpowerwall

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Googles says XT90 (I would assume genuine ones as there are more off-brand ones out there these days than real and in my experience the off brand are 1/4 the rated...)
1. They are rated for 100 amp duty ,designed to handle 100 Amps continuously without exceeding 80°C.

Test for heat and voltage drop you'll soon find their limits
 

daromer

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And if you dont want that heat we generally say max 1/2 of their raiting. XT contacts are known to work on RC and thus you only run for minutes at a time and then the heat that is generated is not a problem since it will cool down in short again.
 

B8rez 2g4

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Jun 21, 2021
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Thanks Daromer. So to be safe ...

Only use 50 amps for the XT90's
And 30 amps for the XT60's

My motor bursts @ 42 amps for very short periods

It should be OK
 
Last edited:

ajw22

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Nov 16, 2018
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The cable used will be very important, too.
A thicker cable will act as a heatsink and more efficiently draw away any heat generated in the connector. You can even use an oversized cable, and trim away a few strands at the tip until it fits in the connector. Use plenty of solder! Keep adding until nothing more goes in, to maximize electrical/thermal contact with the connector.
 
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