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Connecting the Cellpacks
#11
(08-21-2019, 08:20 PM)Korishan Wrote: Also be aware that the XT90 can only do a max of 90A continuous, and that's if they are the legit connectors, and not knockoffs.

I have always wondered how a (legit) XT90 can be rated at  90 A (Continuous), 120 A (Peak) when the best you can do is stuff an 8 gauge more like 10 gauge wire into it and solder?

To do ~90A on the best rated copper wire it needs to be 4 gauge. How do you do that?
Maybe I am missing something here so if someone could enlighten me please do so.


Wolf
If 18 X 650 = 2200+mAh then we have power! 
May all your Cells have an IR of 75mΩ or less Smile
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Total Cells required for PowIRwall                                   2856
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#12
You can do 90A on that wire.. Its all about the length.

in RC you have perhaps 5cm of wire or 10 at most Wink Its all about voltage drop in the end.
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#13
(08-22-2019, 04:47 PM)daromer Wrote: You can do 90A on that wire.. Its all about the length.

in RC you have perhaps 5cm of wire or 10 at most Wink  Its all about voltage drop in the end.

Yea I get that so as "long" as you don't get too long (of wire) its OK to use a smaller gauge wire.

Case solved
Thanks
Wolf
If 18 X 650 = 2200+mAh then we have power! 
May all your Cells have an IR of 75mΩ or less Smile
Last count as of 8/7/2019
Total Number of Cells Recorded and processed                 6149
Total Cells required for PowIRwall                                   2856
Total Cells ≥2200mAh, ≥80%, ≥35mΩ, ≤75mΩ, ≥4.12V   2760
For Info Google Drive
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#14
(08-22-2019, 04:27 PM)Wolf Wrote:
(08-21-2019, 08:20 PM)Korishan Wrote: Also be aware that the XT90 can only do a max of 90A continuous, and that's if they are the legit connectors, and not knockoffs.

I have always wondered how a (legit) XT90 can be rated at  90 A (Continuous), 120 A (Peak) when the best you can do is stuff an 8 gauge more like 10 gauge wire into it and solder?

To do ~90A on the best rated copper wire it needs to be 4 gauge. How do you do that?
Maybe I am missing something here so if someone could enlighten me please do so.


Wolf

That's another reason I'm not a fan of the XT series. I think they're designed for total circuit runs no longer than a foot or something round trip, because the gauge wire they comfortably accept seems woefully undersized. That's great for small handheld packs in RC but would worry me for the larger packs with a much longer run. I'm sure it'd be fine for the most part but who wants their cables heating up in the wrong situation?

Edit: didn't read daromers response before opening my yapper. So 5 to 10cm seems much more realistic. But that does really limit the uses of the XT series.
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#15
(08-23-2019, 07:23 AM)OhmGrown Wrote: That's another reason I'm not a fan of the XT series. I think they're designed for total circuit runs no longer than a foot or something round trip, because the gauge wire they comfortably accept seems woefully undersized. That's great for small handheld packs in RC but would worry me for the larger packs with a much longer run. I'm sure it'd be fine for the most part but who wants their cables heating up in the wrong situation?

Edit: didn't read daromers response before opening my yapper. So 5 to 10cm seems much more realistic. But that does really limit the uses of the XT series.

Ahh you can open your yapper anytime Big Grin

The 5cm to 10cm is the combination I was missing to the puzzle. It would be nice for the XT connecter sellers to disclose that.
Maybe some of them do and some of it should be common knowledge. Sometimes you just scratch your head and wonder overlooking the obvious.
I still think to join my packs together in series as the wire length is very short I will probably use them (XT90) with as large of a wire as I can stuff into them reasonably and use 2 of them all in parallel so I would have (4) AWG 8 cables I am hoping. But maybe AWG 10  to connect my packs is sufficient as 4 AWG 10 in parallel would be 120A anyway and the V drop and resistance would be minimal for the short length. For the end terminations of the pack 48V nominal + and - more than likely proper Anderson connectors that accept large gauge wire for the longer runs.

Wolf
If 18 X 650 = 2200+mAh then we have power! 
May all your Cells have an IR of 75mΩ or less Smile
Last count as of 8/7/2019
Total Number of Cells Recorded and processed                 6149
Total Cells required for PowIRwall                                   2856
Total Cells ≥2200mAh, ≥80%, ≥35mΩ, ≤75mΩ, ≥4.12V   2760
For Info Google Drive
Not your average Wolf       
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#16
If you're pushing 52Amps continuously, you may want to use some thicker cable.  AWG10 would get pretty warm.

Also, having more mass and surface area in the cable will help keep the connector cooler.  
I'm stuffing in an AWG10 into an XT60 by trimming a few strands at the top.  You could probably do something similar for the XT90.



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