hlpressley

iTrader: (209)

What is the minimum C rating that you guys will use to power your 1/8 buggies? Not really looking at extreme performance here but more along the lines of reliability and safety.

mydudrevo

iTrader: (1)

A lot of guys including myself have had great luck with the 20-30c turnigy packs.

Davidka

iTrader: (86)

+1, there's plenty of power. No point in spending a bunch of $$ on the flavor of the month in 1/8th scale.

qZOMBIEXTUNAp

Seems like a bit on the low side. My SCTE would not like anything less than 45-50c. But Ive never ran 1/8 electro. Is it somthing in the higher voltage that dosn't require a high C rating?

mydudrevo

iTrader: (1)

Yes sc requires batteries 50+c rating. More volts -
Less amp draw. Less volts - more amp draw.

That's why 6s low kv setups are so efficient

Dave H

Yes, most racing 1/8 scales aren't that hard on the batteries, at least electrically. Generally 35C is plenty from what I have seen.

They are hard on them physically though, make sure they well secured. Most use velcro between pack and tray to help hold them in place. Some padding to the front, wires to the back side (most hard impacts are from the front).

Pulse_

keep in mind there is no standard measure of C ratings so it really depends on the batteries

in 6S I would say 25C is a good beginning, in 4S 35C.. there are current drops that can cause troubles to the esc with low C rating batts so rather be safe than sorry

SvenRu

C-Rating depends on the capacity of the battery! So a discussion about the C-Rating without calling out the capacity is worthless because it's not comparable.

Just do a little math:

Let's take a Ezrun 150. This ESC can do 150 amps. Which means the battery has to deliver 150 amps to fulfill the max of the ESC. Now take a 5000mAh lipo. With 20C, this battery only delivers a maximum of 100 amps. That means, either the ESC never delivers the power he could, or the lipo will fail after a short time.

Now take a 8000mAh lipo with 20C. This lipo can deliver 160 amps. Completely different situation with the same C-rate.

To make a long story short: I'm only taking lipos which can deliver the amps the ESC draws as a max + 50%. Take the EZrun: 150A + 50% = 225Amps. With a 5000mAh Lipo, that requires a 45C. With a 7000mAh lipo, something around 30C is enough.

Greetings
Sven

stascom

iTrader: (10)

^ I'm with that guy.

lovethebuggy

That was super informative... I guess i will have some troubles with the Reventon R and my 5000mAh 25C lipos... As it draws 70A but 480 bursts, I'm correct thinking it wont be able to go through the bursts??

stascom

iTrader: (10)

Motors never burst that high. 100-120A is typical, unless it's a Tenshock.

SvenRu

We should never assume that the lipos are *really* capable of delivering what they should deliver. That's why I add a security ratio of 50% on the so called C-rates.

5000mAh with 25C means 125Amps...with a 70 Amps ESC (just ignore the burst, that's just pure marketing ;-)) you should be fine.

Greetings
Sven

Dave H

Need to add the motor into the calculations to have much relevance. Otherwise the ESC is as likely to blow up as the lipo.

Davidka

iTrader: (86)

The amp rating of a speed control is not important beyond estimating how much you need to match the motor you want to run. The motor draws the power, not the speed control.

SvenRu

Yes, that's right up to the limit of the ESC. The motor will never draw more amps than the ESC is able to deliver (at least not for long ;-)).

Greetings
Sven