E-Power 101

TManiaci

Engineer
Lifetime Supporter
Thank you, That is a LOT of helpful information, and takes some of the brain-ache out of the equation.
Wiring up 2 packs into an 8S, would increase the speed, and get the prop diameter smaller too.
The shorter flight times, 4 or 5 min, is fine, or, as you stated, double up with 4 packs, 2S-2P, into a a 4400mah, 8S combo.
I am expecting the build to start in a week or twos' time........and once I get it framed up, and space figured out, I will start shopping for the motor and esc.
yea, just look out for those 400-600 kV outrunner motor specs. Most are only good for 6-7 cell packs. Do not try to run a 8S setup on a 7S motor, it will smoke.
 

TManiaci

Engineer
Lifetime Supporter
I'd like to use the batteries I have...since I have (8) 4S, 2200 packs already. :)
When you do a parallel pack setup, be REAL careful about the pack charge states. When packs are fully charged, they need to be close in voltage. You should consider doing a few charge-discharge cycles and then check the charged voltage of all the packs. If any one pack is low more than 1/2 volt or more, you may need to toss them. When you hook all of the batteries up, the parallel set with a higher voltage will discharge into the lower voltage packs. If that voltage difference is too much, it could be really ugly. The current can run without any limits, and a large difference could result in hundreds of amps of discharge current making lots of fire. This is a place for extreme caution. Always check voltages before hookup. If you mix up a used battery with a fresh pack, it's a bad day.
 

JeffinTD

Well-Known Member
Actually, I was going to suggest a passage about safety practices be added to your excellent and informative thread.
 
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