How to calculate low voltage alarm for 4S? - RC Groups
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Jan 18, 2013, 02:50 PM
Registered User

How to calculate low voltage alarm for 4S?

Greetings all! I recently finished my QAV500 build and have it powered off of 4S flight packs. I'm used to flying 3S, and I'm trying to calculate 20% and 30% low voltage alarms for my balance connector plug in low voltage alarm. What should the overall pack voltage read at these two points? What should each cell's voltage be at these two points? My math skills are not working today...

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Jan 18, 2013, 03:22 PM
A man with too many toys
The easiest way is to take the 3s voltage setting that you were using and multiply by 4 and divide by 3.

If it was 3.4v per cell on 3s that would be a cutoff of 3.4 x 3 = 10.20v

For 4s: 10.2 x 4 / 3 = 13.60v

Jan 18, 2013, 04:14 PM
Registered User
Voltages for each cell are exactly the same as for the 3S packs you're used to.

Then overall pack voltages are 4 times individual cell voltages (instead of 3 times). It really doesn't get much simpler than that .


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