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02-08-2006 05:00 PM  12 years agoPost 1
Awamori

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Minot, ND

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Installed Lipo Guard and now my flight times are lasting almost 14 min. I know what your thinking your killing your battery! That's what I was thinking the first time I went to 12 min. I set the guard up for 9.6V and before the thing even starts to beep I'm at like almost 14 min of uninterrupted flight time. For the record I'm only hovering and doing very slow circuts but this just seems like such a longer time than most. I'm using the newer Thunder Power Prolights and today after 15 min the guard started to beep so I brought it down and I thought for sure I had exceeded my limits this time. To my suprise I get home and hook the battery up to my ICE charger and it's telling me I have 10.6V Has anyone else experienced times like these? I keep hearing after 10 I bring it home! If my voltage is reading that high how can damage be done? Also this is the second time I have put about 2050mah back into it. Well I just thought I would ping the other TREX brothers for times cause this is great if I'm not trashing my batteries

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02-08-2006 05:26 PM  12 years agoPost 2
gkoutsis

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Athens Greece

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When the battery is under load, the voltage is lower than what you see on the ICE.

However, I have a feeling you haven't setuped your guard correctly.

If you are putting back 2050mah it means you are almost draining your batteries. Maybe lower than the safe voltage.

I stop flying when I feel the headspeed going lower. On a 2200 pack I put back 1800 +-50.

If I were you, I would check the settings on the guard.

George

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02-08-2006 05:32 PM  12 years agoPost 3
Rob_T

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It's normal for the voltage to increase again after flying, so the 10.6V your charger indicates is probably right.

EDIT I have removed a claim on an exact relationship between depth of discharge and battery life. I may have misinterpreted the data I was looking at...

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02-08-2006 05:40 PM  12 years agoPost 4
Awamori

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Minot, ND

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gkoutsis,
Well I just put my lipo guard through the set-up mode and it beeped/blinked green at the #8 position. This is exactly where I stated it was in the original post. 3-cell limit @ 8 = 9.6V for a three cell. Are you thinking I should up the setting even more? Like lets say 9.9V or 10.2? I was under the impression you just don't want it to drop below 9.0V no matter what. Is it possible I am and then by the time I get home I'm at 10.5V. If thats the case then what good would the LiPo saver do me? Now I'm getting a little confused. May be I should just mount a stop watch to my radio

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02-08-2006 05:49 PM  12 years agoPost 5
gkoutsis

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Athens Greece

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May be I should just mount a stop watch to my radio
Thats what I am doing with mine. I have calculated that arround 11mins is the best for my batteries. Tne pack will last arround 13 mins until the ESC decides to cut at 70%. So I figured 11mins is ok.

George

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02-08-2006 05:59 PM  12 years agoPost 6
Rick_H

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Boulder City, Nevada

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Awamori

Your setup is correct, when you start flying 3D the times will go down. The 10 minute recommendation is a safety point for those who don't use a Li-Po guards. Anytime the battery voltage falls below the preset limit your Li-Po guard will either flash or beep or both. I use this to adjust my pitch range (with a fresh battery) so I don't overload the battery doing 3D moves.

Taking 2050Mah out of a 2100Mah battery is fine as long as you don't run the battery below the voltage threshold.

Enjoy your long flight times

Rick

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02-08-2006 06:09 PM  12 years agoPost 7
Awamori

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Minot, ND

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Thanks Rick,
I was thinking the same as you stated. Now that I know my lipo guard is right I'm going to do like you said and enjoy the long flights. The last battery I charged was 1062mah. So I believe this lipo guard is working like it should and I'm going to keep it at 9.6V as my limit. Also the beeping starts slowly then increases to a steady, but I always try touch down before that happens. As soon as the throttle is shut the voltage rises and the beeping stops. I'm just happy to be getting longer flight times and really believe Lipo guards are worth every penny if I get to stay in the air longer

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02-08-2006 06:09 PM  12 years agoPost 8
Ozydego

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Westerville, Ohio

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2050 is more than the 85% discharge limit that the manufacters recommend. 85% of 2100 is ~1750 over that and you are slowly killing your battery. I would tinker with the lipo alarm to get it to go off so that when you get it on the charger you have only taken out 1750mah... maybe is 9.9 or 10.2. I would use the alarm not as a voltage indicator, but as a rough mah depletion indicator. It may take a couple cycles to get it where you want it, but you will save your lipo life in the end...

But Honey, I can't live with just stock.....

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02-08-2006 06:20 PM  12 years agoPost 9
Awamori

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Minot, ND

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Ozydego,
I'm understanding what your saying but is this 85% coming from the mah or rated voltage. This LiPo guard seems like its doing its job and my batteries are not going below 9.6V. My batteries have about 20flights each in them and we all know TP's aren't cheap, but it seems like there are some mixed opinions on this subject as well.

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02-08-2006 06:56 PM  12 years agoPost 10
Rob_T

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85% is based on the capacity of the pack. The problem is that newer cells hold their voltage better than older generation of cells, which means that at 85% their voltage has not gone down as much as the older generations of lipo did.

A timer is the best way to protect your battery- low voltages warning devices are just there as a backup. (After all, the timer doesn't know that you didn't fully charge the battery, or that you're now running with the belt too tight, or any of the other things that reduce the flying time.)

Edit: incorrect references removed.

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02-08-2006 07:16 PM  12 years agoPost 11
efliernz

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Hamilton, New Zealand

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I use a DIY microscream - adjustable to 9.8v
This gives me over 16 minutes on a 3S 2250 Dualsky. It slowly starts to beep when the battery gets to 9.8v. It may go on and off depending on how hard you are climbing. No matter what, if it is beeps solid in a haover, I have 1 minute before the ESC cutoff hits.

It was a huge surprise how much battery was left after 12 minute flights and no microscream. I have built mine to be adjustable from 6.5v up to 13v to cover 2/3/4 cells in any type of model. Now used in boats, planes and helis in New Zealand

Photos in my gallery.

Pete, Trex500, Trex600E, Streched 600, DSX9, DX7, Low-volt alarms - check the gallery for my alarms

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02-08-2006 07:25 PM  12 years agoPost 12
gkoutsis

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Athens Greece

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Do you have a death wish????????

George

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02-08-2006 07:30 PM  12 years agoPost 13
Awamori

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Minot, ND

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Thanks for all the replies from everyone. Rob_T has some interesting points that are valid. I'm leaning to doing both small timer or clock and my LiPo Guard set to 9.9V. I just tried 10.2 and it beeped when I gunned it. So I'm going to run a fully charged pack at 9.9V and see what I get. My feelings are it would be very nice to just focus on seeing a light/hearing a tune vs. checking my time over and over. I will post more tomorrow (if its not raining) on the results.

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02-08-2006 07:47 PM  12 years agoPost 14
efliernz

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Hamilton, New Zealand

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Hey Geaorge - death wish?
It was actually the first flight all dressed up with stickers. It had done 3-4 flights before that. Yes it was too close. I had a battle with trying to get my wife to take the shot with both heli and me in shot.

I have not had it that close since and don't plan to!!!

Pete, Trex500, Trex600E, Streched 600, DSX9, DX7, Low-volt alarms - check the gallery for my alarms

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02-08-2006 08:57 PM  12 years agoPost 15
Hoverdown3K

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Rochester, New York

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"Nah too close is when you can kiss the skids!

-= I know there is Money in RC helicopters. I put it there=-

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02-08-2006 09:01 PM  12 years agoPost 16
gkoutsis

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Athens Greece

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I have not had it that close since and don't plan to!!!
I lost the tail blade grip once while hovering. They rocketed past me 30 meters away. Imagine having a blade grip failure right there..... I don't even want to imagine it.

Just be carefull man!

George

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02-08-2006 09:05 PM  12 years agoPost 17
Rob_T

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Many transmitters have a timer that you can use- they beep at you when the time is up so there is no need to take your eyes off the model. If your transmitter doesn't, then in the US RadioShack sells the "talking timer" which can be programmed to count down, and announces the time during the countdown. I'm sure you can get something equivalent.

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02-08-2006 09:17 PM  12 years agoPost 18
Pistol Pete

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Seffner, FL

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10.6
sounds just about right...thats what I measure afterwards. would not hurt to fly one less minute just in case.

~~Enjoying the hobby one flight at a time~~

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02-09-2006 05:54 AM  12 years agoPost 19
Rick_H

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Boulder City, Nevada

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Where are you guy's getting your information?

ThunderPower's Documentation only talks about not discharging voltage level below a certain point. Nothing about discharging below a Mah rating. It does state that if the pack won't charge above 80% of it's rated capacity that the packs useful life is over. So how would you ever know if your pack has gone bad if you never discharge it below 80% of rated capacity.?

http://www.thunderpower-batteries.c...etyWarnings.pdf

Rick

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02-09-2006 08:46 AM  12 years agoPost 20
Rob_T

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EDIT: deleted source of original data - I may have mis interpreted the graphs.

I started looking out for this info when I observed that succesive cycles run on the same new battery yielded lower and lower capacity. I have measured on a TP prolite 2100, that each discharge to 3V per cell (as most cyclers do) produces a permanent 1% reduction in the battery capacity each time it is done. (I stopped at 4 cycles, not wanting to ruin the battery, so I dont know if this effect stops after a while, but I dont think it does.)

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