4p configuration question

[jingalls007]

This is going in a 36? AC Nitro Cat w/the packs in the sponsons.

-2x4s 6000mAh + 2x6s 6000mAh packs.

My plan was to connect each 4s pack to a 6s pack in series (10s 6000 mAh) then connect parallel to the controller for 10s 12,000mAh; however, when I connected the 4s to the 6s via a ?y? adapter, I got a spark.

I can connect the 6s packs in series without a spark. Same with the 4s packs.

Does this mean that I have to connect the 6s packs in series, the 4s packs in series then parallel to the controller?

Thx for the help. I?m trying to avoid burning down the house 🤯

[Fluid]

There is a terminology problem here. You are wanting a 10S2P power system, not 4P. I assume that each pack is 6000 mAh capacity, not 3000 mAh. A spark is normal when connecting to the ESC, it lets you know your ESC caps are working. Connect a 4S and 6S pack together in series, then parallel with the other 4S and 6S in series with the Y connector. Without seeing your layout, that’s the safest option. Do NOT parallel 4S and 6S packs together....



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[RaceMechaniX]

Jarrett,

Besides Jay's comments about the nomenclature, it sounds like your two 10S parallel lipos are not at the same voltage if you see a spark when connecting the two 10S packs in parallel.
I run a 10S2P cat with a similar configuration of 4S and 6S packs to a single controller. I connect the 4S and 6S packs together first making a 10S pack on each side.
I then connect the negative of each 10S side to the negative of the ESC. Then connect the positive of each 10S pack to the ESC.

You should not see a spark when connecting the second 10S pack to the ESC. If you do this means the two 10S batteries are at different voltage levels.

A quick check would be to connect the the 4S and 6S packs on the bench to make your 10s packs. Use a multi-meter and check the positive and negative of the complete 10S pack. You should be within 0.1V on both packs.

-Tyler