Battery question

[Rehost]

Hey guys, I can't seem to find a concise answer to what voltage I should bring down my F550. I'm running stock with 10" Graups and 4s 5100mah as well as a gopro hero3 (no gimbals).

I have a feeling my Naza is warning me too early since, when I recharge, I put back 2500mah at the most after about 6-7 mins of flying. The battery is brand new KYPOM brand.

Thanks for any help!
Dan

 

[bruce365]

Hi Rehost, normally about 3.5 volts per cell should be your absolute bottom limit (with 4 cells = 14 volts).
In naza (Depending on motors you are using) with stock motors and 10" grapners I set my voltage cutoff to:-
First level 14.75 - 0.75 = 14 volts
Second level 14.15 - 0.75 = 13.4 volts
If you allow your battery to get to Second level (if activated in naza) your craft will come down fairly fast and you can not control this as naza is making an emergency landing.
regards - bruce

 

[Rehost]

Thank you Bruce!

I'm definitely going to try those settings. I think Naza defaults to being extremely safe at the expense of at least 3 mins more runtime.

When you say comes down fast, is this a Failsafe or just lacks power? And how fast is fast? LOL

Thanks again!
Daniel

 

[bruce365]

Hi Rehost, Naza lands the craft very quickly (its decent is fast but still controlled by Naza), faster than you would probably normally land, its a form of failsafe in that naza knows that once your 2nd level voltage settings have been reached there is not a lot of energy left in your battery and it has to land quickly before your hexa falls out of the sky because you battery is drained dry.

When your Battery reaches the second level (and you should not allow the voltage to get to that level) the battery will only have about 5 to 7% energy left (about one minute or less flight time) and you can understand the urgency of getting the hexa on the ground.

You should normally never allow your battery to go below the 20% remaining mark, of its maximum capacity, in other words if your battery has a capacity 5000Mah you use 4000Mah and leave 1000Mah in the battery.
Regards - bruce

 

[Rehost]

Wow thanks Bruce. I'm guessing I could set my radio telemetry to alert me at 14.5 volts that way I have remote notification before I hit second level. Damn these things are smart LOL