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Lipo Receiver Pack Runtime

Lipo Receiver Pack Runtime

Old 05-26-2014, 05:09 PM
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Default Lipo Receiver Pack Runtime

I am running a car with a very restrictively sized battery box, and before hacking it apart was wondering what kind of runtime Lipo receiver packs get...so what min capacity would I need for:

20 minute main
30 minute main
45 minute main
1hr main

How much are people taking out of their cells during a main?

Thanks!

Dave
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Old 05-26-2014, 05:12 PM
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I get about 1hr out of a 1700.
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Old 05-26-2014, 05:21 PM
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It depends on your servos. I know the scientists here on RC tech claim all servos draw the same voltage but that's just not true. My Hitec 7955 servos use about 1300 mah in 90 minutes of use.
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Old 05-26-2014, 05:33 PM
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My Ko Propo H.C response servo's draw about 1400 during a 60 minute final from the 1600 life battery that i run
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Old 05-26-2014, 05:52 PM
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I never run longer than 1h at practice on 1 pack. Run 1 pack for the quals and then always charge or replace the pack before the main. Loosing control is not worth it.
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Old 05-26-2014, 05:56 PM
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depends on the servos. My Futaba's pull about 1400-1500 an hour, My RadioPost pull about half that
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Old 05-26-2014, 10:32 PM
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It will also depend on how much you use your brakes. Someone that is always on the brakes hard will use more juice than someone that rolls through the corners more.
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Old 05-27-2014, 12:51 AM
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Originally Posted by Jaz240 View Post
It depends on your servos. I know the scientists here on RC tech claim all servos draw the same voltage but that's just not true.
Exactly.
On 1700mah LiFe I get
Futaba BLS servos - more than 2hrs
Savox 1258tg - slightly above 1hr

Draw your own conclusions from that, but obviously mine was that Futaba draws way less than Savox. Hence I now run only Futaba.
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Old 05-27-2014, 01:17 AM
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Originally Posted by Eivind E View Post
Exactly.
On 1700mah LiFe I get
Futaba BLS servos - more than 2hrs
Savox 1258tg - slightly above 1hr

Draw your own conclusions from that, but obviously mine was that Futaba draws way less than Savox. Hence I now run only Futaba.
1258 seems to be most hungry servo today: it draws full 5 Amps in stall mode at 6.0V! Even HV brothers - 1268 and 1267 - eats only 3.5Amps. Thats why those 58's kills so many esc BECs.
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Old 05-27-2014, 02:50 AM
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Originally Posted by vandalzzz View Post
1258 seems to be most hungry servo today: it draws full 5 Amps in stall mode at 6.0V! Even HV brothers - 1268 and 1267 - eats only 3.5Amps. Thats why those 58's kills so many esc BECs.
And that's not even the worst part, the gears are seemingly made from some kind of aluminum grade butter, and at the slightest touch will deform into a mangled mush.
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Old 05-27-2014, 03:09 AM
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Originally Posted by Jaz240 View Post
I know the scientists here on RC tech claim all servos draw the same voltage but that's just not true.
It depends which part of your claim....

Voltage is not drawn but given and all servo's do take/handle the same voltage (5-7v)

Current is drawn by the servo's and that can differ a lot. With my onroad depending the track my Savox 1257 servo's do use about 550mAh in 30 minutes.
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Old 05-27-2014, 03:25 AM
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I have about 7.6v left with a 2400mah Lipo running the savox 1267/1268 HV servos after 3x 7min qualifiers and a 30min main, easily last a days racing.
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Old 05-27-2014, 05:41 AM
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Originally Posted by Nitro Tiger View Post
I have about 7.6v left with a 2400mah Lipo running the savox 1267/1268 HV servos after 3x 7min qualifiers and a 30min main, easily last a days racing.
What if you don't make the A and make the B or even C and start bumpin up?
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Old 05-27-2014, 06:04 AM
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I guess you should have a extra battery. I have always had 2 or 3 batteries with me at races.
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Old 05-27-2014, 09:46 AM
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Right! The best point is to either make sure your pack can handle a full day including bump ups or you have to charge it or swap it for a fresh pack. The agama radio box has so much room I can fit. 2600 MAH battery in it and coupled with the fact that I think the Hitec 7955's have one of the lowest draw rates out there I think 2 1/2 hours of continuous running is possible with 1 pack but I've never pushed it that far. Our track is 2 - 7 minute quali's and a 20 minute main and we usually don't have enough for B mains so I've never had to worry about it. I usually run about 20-30 minutes of practice before racing and then there is about another 20-30 minutes that the car is on for tuning or warm up.
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