Now before you say anything, I know I'm insane...
 

...but I'd like your help on something. I won't tell you what it's for because you'll call me crazy...but could I run a pair of two 9L Feigaos, each with it's own Warrior 9918 controller, off of a single bank of 14 cells?

It should give a maximum amp draw from the cells of under 140A, which I'd have thought the cells could handle. I also considered running 10L's with 16 cells, this would be easier on the amps (just over 120A). But I just want to check that the cells could handle this amp draw...thanks for any help guys. :)

I do the same thing on my clod with two 7S and one 9 cell pack. It will work but might be hard on the cells. Just watch the battery temp and don't expect long run times.

Thank you,
Promod

I doubt you would be able to do run 2 9L's off a single set of cells. JONNYMAXXIMA runs duel 9L, but has 28cells. Running 2 hot motors like the nemesis 9L on one set of bats is only asking for trouble...

You didn't state what you wanted to run this set-up in, you could of course try using D size cells if you have space - but 14 D cells would weigh and cost about the same as 28 sub c cells. The other option is to just go for a bigger single motor, which would probably cost less as well

sorry, but you want to run two pairs, as in 4 motors?

Each 9L is able to take the full power from a batterie pack, you need to use 4 sets of 14 cells if you want to do this.

Judging by the calculations that he made, I would say he only wants to run 2 9L's, not 4 (as it indicates)...

and if it where two pairs, each being fed by one pack.. the calculation is right as well. I don't ask it for nothing. Being insane is not running a dual brushless, it is running a quad brushless. that's why i asked.

and like i said, one 9L allready can take the full load from a a 14 cell pack. so there was some information in my reply as well.

Thanks for all your replies so far guys:-). Well, I'd be running this is my Dagger, but don't worry, it is not any ordinary Dagger (I don't know if you remember Cold Fusion that I showed a while back? That's the one, but she's progressed and improved much further since then). I won't go in to details, but it should be able to handle that kind of power...she could take it.

The reason why I want to go more this powerful is that my Dagger is big, and comparatively heavy (it will be around 4.5kg fully laden). I was orginally planning a pair of 8S motors on 8 cells each (16 total), but I think the rear motor would struggle a lot on acceleration. When the Dag acellearates, most of the load goes on the rear motor and I think it would have trouble. This is why I'm looking in to the "L" size motors. And I can't run only 1 motor as I'd lose 4WD, which I want to keep. Lastly, my custom chassis can't carry more than 16 cells, that is it's limit.

Yep, I plan to run a pair of 9L's or 10L's. If the amp draw would be too much with the 9L's then 10L's with 16 cells wouldn't be a problem for me to do. If Promod runs a pair of 7S motors, then that's 186A, so surely my 16 cells could handle 120A? Correct me if I'm wrong, though.

Thanks for all your help...:D

Running two motor/controller systems off one set of batteries will work, but as most folks mentioned, it will be limited by the batteries ability to deliver the amps. I have done it before, but the runitmes were pretty short. I think the dual 8s motors carrying 8 cells each (each its own system) would be a better overall setup, to be honest with you. You won't have any trouble with power, either. One 8s with 8 good cells is fairly impressive in a 10 pound e-maxx, Two on your dagger will have some serious power. You could also consider LiPo power to reduce some weight. If you are thinking of dropping the $$ on a dual brushless setup, why not go right to the next level and jump to Lipos?

Maybe you can run two different sized motors with similar kv. You could have a 12s in the front and a 9l in the rear.

No, running two different motors is not a good idea. it would work, but the risc of wasting a controller is too big.

Thanks guys. Admittedly I didn't really think about runtimes, they would be pretty bad wouldn't they on only one set of batts. Mike, ok you've won me over, I'll stick with the 8S setup!

As for LiPos, well I have thought about them, but there are two problems: one is that the custom chassis I'm getting cut is only designed to accept normal NiMh stick packs (there were designing probs with side x side or LiPo-shaped packs fitting), and secondly, LiPos kinda confuse me. All this about the various discharge rates measured in "C" (no idea what that means, lol) is the main prob. Other than that I'm worried they could be easily damaged from debris and such, given the chassis' design. And then there's the expense! I'm sure they are a great type of batt, from what I've heard, but I don't think I 'd be able to really use them in CF...good suggestion tho. If I could, I'd use them.

Now I know I keep going on about this BL setup, but one day it WILL happen, lol! There are just no jobs around, and I need to get one. Haven't had a job for months. Anyhoo, thanks for your help everyone!

Well, if a 3000 mAh pack is 20C it means that it van deliver 20X it's own value, meaning 20X3000=60000mAh=60A

Get it?

You need a good charger for those packs, and be carefull when charging them.

In other words C=capacity. A discharge capability of 10c means it can discharge continuosly at 10 times its capacity, so a 3amp pack (3000mah) can discharge at 30 amps.

Ah, that makes sense. Cheers, that helps a lot, I might consider LiPos for future trucks/projects... :-)