RCCrawler Forums

rash_powder · 08-07-2007, 08:34 PM

Hey all,

Me and a friend are in a little quibble as to how much current our little rc motors and batteries are putting out. I say they can hit as much as 30 amps, possibly more. He says it isn't possible for them to deliver/draw 30 amps, no more than 10 amps maybe.

He also mean Amp hours when we say amp, and aren't talking about real electronic world amps.

Now, I don't really want to spend the $60 to get a watt-meter to install in my brushless rc18t and in my clod crawler to get watt, amp, volts and such numbers. That is a lot of cash that I could use toward parts, but if I have to in order to settle this I will.

So, what I am wondering is if any of you guys know or can get/give or direct us to a reliable source of this information.

Thanx,

rash

Tanis · 08-07-2007, 11:35 PM

1 word(actually 3)

, Johnrobholmes

DKNguyen · 08-08-2007, 11:18 AM

What do you mean when he says amps, he means amp-hours, not real world amps? The terms amps and amp-hours are both very real world and have very different meanings. The two terms are not interchangeable so if you mean amps, say amps and if you mean amp-hours, say amp-hours.

If he is saying the battery we use cannot deliver no more than 10 amp hours, he is right (have you ever seen a 30 amp hour battery in RC?). I think the largest one I've seen for these crawlers is a 4 amp hour lipo pack. If he is saying they cannot deliver 30 amps, he is wrong. Amp-hour is a measure of energy (Joules, which a wattmeter can't measure), and amps (combined with voltage) is a measure of power (Watts, which a wattmeter can measure).

It would seem that he is arguing about energy and you are arguing about power. Both of you have the right meaning, but someone has their terminology mixed up.

A battery that can deliver 1A for 1 hour (1 amp hour) is able to output 10A, it just won't be able to keep it up for anywhere near an hour.

JohnRobHolmes · 08-08-2007, 11:31 AM

Motors can pull 30 amps, batteries can deliver 30 amps. 30 amp hour batteries are not possible yet for small scale RC, but many motors can easily pull 30amps/hour.

08-07-2007, 08:34 PM	#1
rash_powder Rock Stacker Join Date: Dec 2006 Location: Grand Forks Posts: 81	motor and battery current Hey all, Me and a friend are in a little quibble as to how much current our little rc motors and batteries are putting out. I say they can hit as much as 30 amps, possibly more. He says it isn't possible for them to deliver/draw 30 amps, no more than 10 amps maybe. He also mean Amp hours when we say amp, and aren't talking about real electronic world amps. Now, I don't really want to spend the $60 to get a watt-meter to install in my brushless rc18t and in my clod crawler to get watt, amp, volts and such numbers. That is a lot of cash that I could use toward parts, but if I have to in order to settle this I will. So, what I am wondering is if any of you guys know or can get/give or direct us to a reliable source of this information. Thanx, rash

08-07-2007, 11:35 PM	#2
Tanis Keep it real Join Date: Jun 2006 Location: Yakima,WA Posts: 6,532	1 word(actually 3), Johnrobholmes

08-08-2007, 11:18 AM	#3
DKNguyen Quarry Creeper Join Date: Jan 2007 Location: Alberta, Canada Posts: 308	What do you mean when he says amps, he means amp-hours, not real world amps? The terms amps and amp-hours are both very real world and have very different meanings. The two terms are not interchangeable so if you mean amps, say amps and if you mean amp-hours, say amp-hours. If he is saying the battery we use cannot deliver no more than 10 amp hours, he is right (have you ever seen a 30 amp hour battery in RC?). I think the largest one I've seen for these crawlers is a 4 amp hour lipo pack. If he is saying they cannot deliver 30 amps, he is wrong. Amp-hour is a measure of energy (Joules, which a wattmeter can't measure), and amps (combined with voltage) is a measure of power (Watts, which a wattmeter can measure). It would seem that he is arguing about energy and you are arguing about power. Both of you have the right meaning, but someone has their terminology mixed up. A battery that can deliver 1A for 1 hour (1 amp hour) is able to output 10A, it just won't be able to keep it up for anywhere near an hour. Last edited by DKNguyen; 08-08-2007 at 11:32 AM.

08-08-2007, 11:31 AM	#4
JohnRobHolmes owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down! Posts: 20,290	Motors can pull 30 amps, batteries can deliver 30 amps. 30 amp hour batteries are not possible yet for small scale RC, but many motors can easily pull 30amps/hour.

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