Re: [Paparazzi-devel] voltage drop on full throttle

[Gerard Toonstra]

It depends if you saw the same some time ago. Lipo's have some internal resistance which increases over time, resulting in a voltage drop.
If you feel that the lipo starts to feel a little bit "soft" (puffy) instead of a hard casing, it's an indication its quality reduced more and one or more cells are close to dying. 
On one 4s I have, one cell is bad and the voltage drop is 1.5V on a simple quadrotor.

The voltage drop may cause failsafes or a plain voltage failure in the air. 

Another thing is that the classification of some lipo's in terms of current it can deliver is optimistic. There are lipo's where they don't make it clear
that the number means "burst" current vs. continuous current and even then sometimes need to be divided by half.


Filte test did a lipo test some time ago:

https://www.youtube.com/watch?v=KvIaLN4AVlE

Rgds,

G>

On Wed, Jul 3, 2013 at 7:56 PM, Refik Sever <address@hidden> wrote:

Hello,

After several months of hard work, today we  performed our first flight with paparazzi using manual mode. We also tried auto1 and auto2, for short periods. It was not too bad. It couldn't circle using auto2. Tomorrow we will try to tune the aircraft and play with the control gains.

There is one problem. When we give full throttle, the voltage drops by 0.8V. Is it a normal situation?

We had a crash last month, and all the cables from battery to ESC were broken, and we re-soldered them. Is this voltage drop occur due to the resistance of the re-soldered cables?

Cheers,
Refik 

_______________________________________________
Paparazzi-devel mailing list
address@hidden
https://lists.nongnu.org/mailman/listinfo/paparazzi-devel