Quote:
Originally Posted by Bondonutz
why do they use 12G with some of the Flightmax 4s 30C packs I bought and one of my buddys who has 3s Turnigy packs have 8G wire.
WTF is up with that ?  |
Wire gauge in LiPo packs usually reflex the current level. for Turnigy, say a 5Ah pack, I found they use 10AWG on 20C but 8AWG on 30C models, 'cause their supposed current handling capability differs, 100A vs 150A.
Back to the topic I agree with BrianG, ADD EXTRA CAPACITORS.
MMM 's power smoothing capacitor totals only 990uF, electrolytic type. Yes they are high quality Rubycon ZLH type for switching power supplies but still electrolytic. In such a 100A+ switching/pulse application, 990uF electrolytic is far from adequate.
According to Rubycon datasheet, the ZLH35V330uF handles ripple current of 1.33A, three on board totals 4A, only. And the reality is ESCs are all switching type, currents are all in pulse form. This may not be a huge problem in RC cars for its not fully loaded continously. A high quality battery with extremely low source resistance will help A LOT smoothing out the ripple current, making the voltage relatively constant.
When subpar packs are used, because they have higher IR, extra capacitors are highly recommended, 4700uF or greater. Make sure they are high quality type designed for switching power supplies. They will iron out most voltage ripples to help the on board caps survive as well as the whole ESC.
