Kraton Hobbywing 4985 1650kv cooling

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jkflow said:
. 5A per fan is not an issue, even 3 of them. No need to worry about unbalancing. On a 5000mAh you will probablybbe 0.1V lower after a 30min bash session compared to the others. Different story for high power fans that draw more than and 1A each. Those are for speed runs and maybe 10min runtime before they could cause unbalancing that matters.
Click to expand...

Sorry don't know how I missed this - thanks for the reply.

The fans I'm using are the centro 40mm 28000rpm fans, it seems the 16k rpm alibaba ones pull around 0.5-0.6 per fan but centro don't quote current draw. It's possible it could pull up to 0.8a-1a as a guesstimate.

I think my reciever can cope with 6A total but I have no idea how much the servo will pull under peak load

Another option I was thinking of was to use a small bec into the balance lead (across all 6 cells so drain is even). Just don't want to fry the reciever

Not sure anyone has tried this before though
 
Woodley99 said:
I'm still confused on the point of BECs, can you help me understand?
Also I have a HW Max6, that has a built in bec right? So I should be good?
Click to expand...

BEC is just a voltage step down circuit - but the max6 bec will plug into the reciever. If you want to bypass the reciever to power the fans then I'm thinking to use a separate bec straight off the 6s battery to power the fans, so too much current isn't being pulled through reciever
Deiglie said:
WOW.

So I can solder Bec to Esc battery connector, so Bec directly to the fans? Then I may not have to have my own 3s battery for the fans .. Have problems that the battery is unbalanced today.

Maybe this one?! https://www.hobbywingdirect.com/products/ubec-10a?variant=1013205920
Click to expand...

This seems like a neater setup actually + I'm not sure what the current limit of the balance leads are? Wires seem pretty thin and probably not much current flow is needed to balance the cells
 
Search for UBEC 7.4V and you will find a couple. Cheaper than Hobbywing.
https://www.ebay.com/itm/132979655201?hash=item1ef6348221:g:3O4AAOSwOVpXc3mt

I just build my own 8S 12V/2A which is enough for my fans. You need some basic solder skills and good eyesight (or phone zoom). Soldering the bridge to get 12V is fairly easy but zoom is needed.
Currently running 2 of these on my infraction, 1 per fan. They say 6S but it's an advertising issue, they are 8S capable (actually marked on the board).
I use clear paint prior to make it waterproof and heatshrink to give it some protection. 8S is confirmed and works just fine. You can find these on ebay and other stores. China was only a fraction cheaper, not worth the wait.
Granted, I did burn 2 of them up when the fans got ripped in pieces, due to high impact. They are cheap enough and I probably would have ripped wires on a Lipo. This also allows you to use 12V fans which are more common.

Hobbywing would work as well but at $40 it's a bit high. They go to 8.4V though.

These are 5V/3A out of the box and need a bridge to get 12V/2A.
https://www.amazon.com/gp/product/B0823QLMWC/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

https://www.amazon.com/gp/product/B07PLSYX9G/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
 
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