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Old Oct 12, 2010, 09:07 AM
Rich in ILM is offline
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Does this spreadsheet make sense?


Although I have done a fair amount of work with batteries and power systems I am new to the LiPo world. I was trying to understand the ratings and decided to make a spreadsheet. Does the attached file seem to make sense? The first 5 values should be changed for different batteries, flight times, and reserves.

Thanks!
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Old Oct 12, 2010, 12:55 PM
hoppy is offline
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The math works out OK
Old Oct 12, 2010, 12:59 PM
Rich in ILM is offline
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Originally Posted by hoppy View Post
The math works out OK
Did I get the interpetation of what 30C discharge rate is? 60/30 = 2 minutes?
The other thing I was going to do is factor in the dropping voltage but it appears 3.3 is a good enough average. Doesn't seem to be a huge voltage swing.

Thanks!
Old Oct 12, 2010, 02:14 PM
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Yup-
If the motor draws an average of 10A, and you have a 2500mah pack, how long will it fly?
Amp draw/Ah of battery = C-rate
10A/2.5Ah= 4 (C-rate)
60min/C-rate = flight time.
60min/4=15min


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