Battery Question

[The Snowman]

I just got a Novak Rooster crawler esc and 55T motor. I also got an 8 cell 1500 mah saddle battery pack.
In the esc instructions it says to use no more than a 7 cell battery pack.
Will I do any damage running the 8 cell or will it just lead to short battery life?

[Harvo]

You will eventually get magic smoke and a toasted ESC. Some people say they have run it like that... but Novak says not to for a reason.

[TattooKenny]

I've run 8 cell split packs on one of my 2.2's for over a year with a Novak Rooster Crawler ESC with no probs.....but with a split pack you can run them in series or in parallel and that would make a difference......

[Gst95dsm]

From what i've read you should be ok, one precaution you can take though is to run a separate BEC. I think the it's the BEC that limits the rooster from handling more than 7 cells. We shall see though.... my 8 cell pack should arrive tomorrow.. lol.

[The Snowman]

What is BEC?

[rlem00]

I just ordered an 8 cell pack from TCS and this has me wondering. I am planning on running my a Novak Rooster 12t to start. Is there a difference between a split pack and a saddle pack?

[treday619]

same thing just different name

[dj23gsx]

Its kinda like asking how many 12 ton trucks can you drive over a bridge designed to hold 10 tons before it fails. Could be alot , could be a little. I'd stick with the manufacturer's specs just to be safe.

[JeremyH]

Originally Posted by The Snowman

What is BEC?

Battery Eliminator Circuit
http://en.wikipedia.org/wiki/Battery_eliminator_circuit

[rlem00]

Not to ask a simple question but I was talking to an EE at work about this today and he threw out some jargon that was over my head and basically ended up it would be a crap shoot. I forgot about the article in winter 09 RCCrawler mag. I am assuming that a few of the members on this forum had some input into this. In the article called Hard Bodyz WartHOG bolt-on Tuber the auther says he used a Novak Rooster and 55t motor and a 1500mAh 8 cell 2/3A batterback from TCS Crawlers. I would assume that these guys know what they are doing, so what gives? Is this a viable combo?

[JeremyH]

Originally Posted by rlem00

Is this a viable combo?

In what regard? (the battery, the ESC or the motor)?? Overall, that combo will work quite well!

Oh, and in general, don't listen to engineers, they don't know squat!

[rlem00]

Originally Posted by JeremyH

In what regard? (the battery, the ESC or the motor)?? Overall, that combo will work quite well!

Thanks, I'm just trying to get a little more know how.

Oh, and in general, don't listen to engineers, they don't know squat!

They can design stuff, guys like me have to make it work

[JeremyH]

Originally Posted by rlem00

Thanks, I'm just trying to get a little more know how.
They can design stuff, guys like me have to make it work

So what jargon was this EE using to justified the fact that he thought that a 1500mAh 8cell battery, 55T motor and ESC wouldnt work.

An engineer might be able to design stuff, but my profession is where their knowledge and theories are derived.

[rlem00]

Originally Posted by JeremyH

So what jargon was this EE using to justified the fact that he thought that a 1500mAh 8cell battery, 55T motor and ESC wouldnt work.

An engineer might be able to design stuff, but my profession is where their knowledge and theories are derived.

that was yesterday so don't quote me, but what it boiled down to is that the reliability of the ESC using the 9.6v power supply would be effected by if the 8.4v maximum was a true max or a nominal max (nominal max would give at least 5% more before he would worry). He also said it would be dependent on what the motor draw was as to how fast the ESC may or may not be fried (higher current draw faster you let the smoke out).

You will have to forgive me as electrical stuff is my weak point, I more of a mechanical and pneumatics guy. So what exactly is it that you do where you are on the otherside of an engineer than me?

[JeremyH]

I have a few degrees in physics and mathematics.

I just reviewed the Novak Spec Sheet ( http://www.teamnovak.com/products/es...ler/index.html ) and it does list the maximum for the Rooster Crawler, which is 7 Nimh cells or 2 Lipo cells wired in series. I forgot that these were the manufacturer suggested maximums for this ESC. He is correct, with lower current draw motors, your ESC might last a bit longer than with higher draw motors (lower turn motors).

BTW, it is a good idea to review the specs of an ESC before you apply power to it (which is something that I did not do before telling you above that the setup would be fine).

[rlem00]

Originally Posted by JeremyH

I have a few degrees in physics and mathematics.

BTW, it is a good idea to review the specs of an ESC before you apply power to it (which is something that I did not do before telling you above that the setup would be fine).

That's why it's called a project team.