Hi Guys I feel embarased to ask this but here it goes.
I have just added a osd to my quad as I am doing FPV, the question is at what voltage will the ESC shut down. I dont let my 4000ma 3s go under 3.3v per cell, but if I miscalculate the time it takes me to return I need some margin for error. So at what voltage will the esc tell me to get stuffed.
Any replies would be appreciated.
Regards Pete
Replies
This $4 HK battery monitor (http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=...) is a must for your Quad. I solderd mine directly to the power distribution board and stuck it underneath, beside the battery, with some foam tape. When my Quad is flying around, I just look up and can tell roughly how much time is left in the battery. When I see red, its time to find a landing pad.
above 11.1V solid blue
10.2 -11.1V flashing blue
9.9-10.2V solid red (time to land)
under 9.9V beeping and flashing red
Thanks much appreciated.
Usually this can be set on the esc. Often 3.3-3.1-2.9V per cell are selectable. Then you can choose soft cutoff (gently reduce motorpower) or hard cutoff (immediately stop motor).
Actually it is best for a copter to set the esc's to NimH batteries, so that the cutoff gets disabled. It's better to damage (only) your battery then to crash your whole copter.
In any case, I have mine set to 2.9, but honestly it doesn't make much of a difference. When a lipo is empty, the voltage drops VERY quickly. So a few seconds after hitting 3.3 you'll hit 2.9 aswell.