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Old Jan 18, 2013, 01:50 PM
Registered User
Joined Jan 2012
69 Posts
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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Old Jan 18, 2013, 02:22 PM
A man with too many toys
United States
Joined Feb 2001
18,537 Posts
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

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Old Jan 18, 2013, 03:14 PM
Registered User
Staffs, UK
Joined Nov 2003
11,158 Posts
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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