Welcome to Multi-Rotor UK. Please login or sign up.

Monday,August 26, 2019, 06:30:47

Login with username, password and session length

Shoutbox

Andy7:
24 Aug 2019 19:21:05
 ~~
Gaza07:
23 Aug 2019 19:26:42
I agree it does look a lot better for some reasom SMF shorten any recent posts display  :rolleyes:
Andy7:
23 Aug 2019 10:29:15
Nice! Looks loads better.  :beer2:
Gaza07:
22 Aug 2019 22:47:32
Sorted mate  ~~
Andy7:
22 Aug 2019 10:27:36
Sure. But basically, all the subjects are getting cut off.
Gaza07:
21 Aug 2019 18:14:54
Can you pm me a screen shot of what you mean
Andy7:
21 Aug 2019 12:15:41
Gaza - can you make the subject line section in the forum topic list wider? It's cutting off the subject field really short.
Andy7:
19 Aug 2019 09:14:20
Good for you!  ~~
DarkButterfly:
18 Aug 2019 19:13:57
Had another negative encounter, it's been a few years since the last one, just an uneducated ******, going on about drones being illegal yada yada yada.    :-/
Still that didn't spoil my flying time, had an absolute blast  ~~
Gaza07:
07 Aug 2019 19:52:01
ooooh mrs jones  :D
Members
  • Total Members: 8066
  • Latest: badger1
Stats
  • Total Posts: 196588
  • Total Topics: 19805
  • Online Today: 60
  • Online Ever: 530
  • (Tuesday,June 26, 2012, 08:34:46 )
Users Online
Users: 0
Guests: 31
Total: 31

Theme Changer





3d - Printworx

Printing 3d Forum

Lipo's and warning voltages.

Started by ChrisH, Friday,February 22, 2013, 08:52:31

Previous topic - Next topic

ChrisH

Hi All,

I';ve been thinking - a rare occurrence - as I am fine tuning the various gains and warnings on a Naza/F450 combo. Now, the thought process. For different sized Lipo batteries the power graph for discharge/time should look similar except that for a larger capacity the time axis would be longer. Therefore, if you are setting the alarm voltages in the assistant, would I be correct in assuming that for a higher capacity battery (5000 3S) you could set the warning voltage a point or two lower than for a smaller (2200 3S) battery. This is assuming that you RTH when the lower limit is reached and the main aim is to land before the critical 3.3V/cell barrier? This is based on my limited understanding of Lipos and that the larger capacity would (should) take longer to drop to the critical level.

I would appreciate a view on this or am I making m head hurt without a purpose?

Hoping for some flying weather this weekend.  :whistling:

Cheers.
Chris
Hubsan X4
DJI F450, Naza, GPS, DX8,
Tarot FY680 Naza, GPS, Hero3 Silver, 5.8 FPV with screen
 :england:

Ross

:hmm: Must admit..never thought of that..but.
Depends how you fly.
I would think    lower capacity battery flown slowly, no fancy stuff  may last longer than a higher capacity flown at high speed and with aeros thrown in......Think  car..driven  fast..driven slower...and result in MPG.
(Well..that';s how I  see it )
Let's be careful out there.
SAFETY is.. NO accident.

ChrisH

Hi Ross,

Agree with that about life versus driving/flying style! I was thinking of the discharge graph from different sized Lipo';s assuming other factors remained the same.

It';s just I had a thought that the warning voltage may be knocking useful flying time off a battery because it cannot compensate for capacity, only voltage and warns too early.

Cheers,  :frantic:
Chris
Hubsan X4
DJI F450, Naza, GPS, DX8,
Tarot FY680 Naza, GPS, Hero3 Silver, 5.8 FPV with screen
 :england:

Ross

Let's be careful out there.
SAFETY is.. NO accident.

sendtohim

Quote from: Ross on Friday,February 22, 2013, 09:30:26
Better safe than sorry!   :rofl: 

i 2nd that if you let them drop to 3.4-3.5v you will notice a power drop and it will not get you out of trouble if you need it

better to be safe than sorry just for a extra 30 secs of flight in some cases
dji f550, still running standerd running gear, with auora 9 controller, 2 x 6000mah nano-tech, 1 x 8400mah nano-tech, 1 x 5000mah turnigy, carbon gimbal with Aeroxcraft landing gear, gopro 3 black edition camera, and to top it off LED's all round for night flying (has to be done)

DarrellW

With my 450 (RCTimer Flamewheel clone) I get about 8 mins of mixed flying from a 2200 mah 3S battery but set my timer to 7 mins, I never like my batteries to drop below 30%!
If you are using a 5000mah then you should get approx 5000/2200x7 mins flying - but personally I would land and use my battery checker a good minute earlier, also remember you get less flight time when it';s cold.
I think..........I think I am........therefore I am.............I think!

ChrisH

Thanks Guys for all the thoughts. It wasn';t about pushing the batteries beyond limits, it was more to do with the theory of the decay of a larger battery compared to a smaller one!

I think I';ll hook up the voltage monitor on the AR8000 Rx then I can see in real time!! See what I feel like tomorrow. Got gains to modify then test. Also modifying the GoPro mount to get rid of a bit of jello. See how it goes.

Cheers all and keep the ideas flowing!  :-/

Chris
Hubsan X4
DJI F450, Naza, GPS, DX8,
Tarot FY680 Naza, GPS, Hero3 Silver, 5.8 FPV with screen
 :england: