esc cutting off to early?
04-01-2012 | 07:12 AM
#1
Thread Starter
Tech Rookie
Joined: Mar 2012
Posts: 6
esc cutting off to early?
im running a hobby wing b5 combo, sky lipo 2s 7.4v 5000mah batt, i charge my lipo around 7.3 with in 5 min truck stops moveing, i have the cut off set at 2v it acts up at 4.5v, also i would think it should take longer to drop around 3v, but im not sure, im new to electric, thanks ahead of time for any help or ideas
04-01-2012 | 09:44 AM
#2
Joined: Nov 2008
Posts: 15,743
From: RIP 'Chopper', 4/18/13 miss you bud:(
A full 2s lipo is going to be 8.4v not 7.4, if I'm reading your post correctly.
And a heavy load can pull the packs voltage down to lvc even though the resting voltage of the pack is higher.
Where are you getting the 4.5v number from? I hope that's not your packs total voltage??
Maybe explain things a little better to help us understand, please.
And a heavy load can pull the packs voltage down to lvc even though the resting voltage of the pack is higher.
Where are you getting the 4.5v number from? I hope that's not your packs total voltage??
Maybe explain things a little better to help us understand, please.
04-01-2012 | 03:28 PM
#3
Joined: Apr 2009
Posts: 3,055
Only use a lipo specific charger for your pack, any charger made for lipo should terminate charging at 8.4V, or 4.2V/cell. The pack will also appreciate if you run the cutoff up to at least 3.4V/cell. If your Sky lipo is at least 30C rated I know it is a very robust pack that should not allow the LVC to kick in with any reasonable setup.
04-01-2012 | 06:09 PM
#4
Thread Starter
Tech Rookie
Joined: Mar 2012
Posts: 6
the volts that im comeing up with is when i plug it back in to my charger, im useing a thunder ac6, on the battery it self its marked 7.4v and after around 5 min of run time, the truck will move for a few seconds stop and move for a few again, try to steer it the wheels barley turn, hope this will help, also if a 2s batt is 8.4v and mine is marked 7.4v should i try and charge it to 8.4 or is that a no no 
, also the batt says 2 cell 7.4v 5000mah 3dc continudus/6dc burts, again thanks for any help
, also the batt says 2 cell 7.4v 5000mah 3dc continudus/6dc burts, again thanks for any help
Last edited by dusty262; 04-01-2012 at 06:15 PM. Reason: forgot to add batt spec
04-01-2012 | 06:42 PM
#5
Tech Master
iTrader: (3)
Joined: Jul 2008
Posts: 1,465
From: Melbourne, Australia
A 2s lipo has a nominal voltage of 7.4v
When fully charged straight off the charger it will be 8.4v
Set your LVC at 3.5v / cell when your pack comes out of your car it should be around 7.4v
A resting voltage of 7.4v means the pack has roughly 20% left in it
When charging you should be adding around 80% of a packs listed capacity back in
5000mah sized pack - 4000mah added when charging
Allthough discharge is not linear here is a handy table to remember
Resting voltage vs Capacity
8.4v - 100%
8.26v - 90%
8.12v - 80%
7.98v - 70%
7.84v - 60%
7.70v - 50%
7.56v - 40%
7.42v - 30%
7.28v - 20%
7.14v - 10%
7.00v - 0%
Cheers
When fully charged straight off the charger it will be 8.4v
Set your LVC at 3.5v / cell when your pack comes out of your car it should be around 7.4v
A resting voltage of 7.4v means the pack has roughly 20% left in it
When charging you should be adding around 80% of a packs listed capacity back in
5000mah sized pack - 4000mah added when charging
Allthough discharge is not linear here is a handy table to remember
Resting voltage vs Capacity
8.4v - 100%
8.26v - 90%
8.12v - 80%
7.98v - 70%
7.84v - 60%
7.70v - 50%
7.56v - 40%
7.42v - 30%
7.28v - 20%
7.14v - 10%
7.00v - 0%
Cheers
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