oOple.com Forums - Lipo advice

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- - Lipo advice (http://www.oople.com/forums/showthread.php?t=25887)

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Quote:

Originally Posted by JJ The Boat Wizzard (Post 256040)

Quote "Technically it is not the current draw which kills a pack, its the relationship between current draw voltage drop and heat. If you draw too much current, the voltage will drop off, below 3v per cell, and damage the pack, end of story.

To put this into real life terms, in a particular type of RC Glider, they draw on average 75-100C (yes you heard me correct there!) from their packs, for a maximum of 3 to 4 seconds. This is way over any packs "burst" rating, but as it only happens for a short period of time, the packs do not go below 3v per cell, the result, they do not kill their packs at the rate you would image them to! If they flew for more than 3 or 4 seconds at this rate then yes, the packs would get damaged. " End Quote

!That is all we have been trying to say!
Thanks for confirming that

John

but there is no way the original posters gear wil draw 75-100c in a car, so your still giving wrong info

So I've been thinking about this a little more...and looked at some numbers for things with regards to matching your motor and esc to your battery, your esc should most likely be over specced according to your motor, and battery.

For example, the Novak GTB is rated at 540A per phase, brushless is a 3 phase motor so that's over 1500A ??? :o (that is probably wrong but you get my point!) that the esc can safely operate with.

Thankfully brushless motors run way below this level, even Novaks fastest motor, the 3.5t Ballistic motor has a power rating of 620W which, using a simple calc (P=VxI), means that it will on average draw around 85A on a 7.4v battery, in very simple terms.

I guess what this means, the element of the system that provides the control should ideally be rated to work reliably with currents well above what the energy source and the load are capable of generating, this means that it can safely and efficiently be in control of both!

Seems logical to me?

Quote:

Originally Posted by mark christopher (Post 256050)

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but there is no way the original posters gear wil draw 75-100c in a car, so your still giving wrong info

NO i never said it would in a 10th car i said it could if you geared it wrong with a 'silly motor' so your giving wrong advice by saying ignor my post as lipos will never puff! and why do you have to argue with everything i say in every post :mad::eh?: clown :woot: im sick of arguing with you now if you want to try it plug a 2500 10C battery off of ebay into your 3turn setup and see what happens :p

Thank you Trakpower. Nice post from someone who people will listen to.

Quote:

Originally Posted by JJ The Boat Wizzard (Post 256072)

so why are you banging on about thingd that are not relevent to the orginal posters question????