RC-Monster Forums - View Single Post - MMM vs MM with A123's.. Check this out boys :D

GriffinRU · **Science & Engineering :) -** 07.11.2008, 05:14 PM

There is a difference in total Fet's Rdon between MM and MMM, but such drop (60A vs 85A) I would relate to power connectors. Unless battery and motor wires were soldered in both cases.
Simplified calc, due to similar (close to be identical) setup:
16V/60A=0.267Ohms
16V/85A=0.188Ohms

0.267Ohms-0.188Ohms=0.079Ohms -> too high value for Fet's difference (5 vs 6 Fet's, even if only one is good). While 10-30mOhms for connectors is normal.

Temperature wise both ESC's and motor were close to each other, right?

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GriffinRU RC-Monster Aluminum Offline Posts: 748 Join Date: Oct 2005	Science & Engineering :) - 07.11.2008, 05:14 PM There is a difference in total Fet's Rdon between MM and MMM, but such drop (60A vs 85A) I would relate to power connectors. Unless battery and motor wires were soldered in both cases. Simplified calc, due to similar (close to be identical) setup: 16V/60A=0.267Ohms 16V/85A=0.188Ohms 0.267Ohms-0.188Ohms=0.079Ohms -> too high value for Fet's difference (5 vs 6 Fet's, even if only one is good). While 10-30mOhms for connectors is normal. Temperature wise both ESC's and motor were close to each other, right?