Quote:
|
Originally Posted by Finnster
From experience I know the 9920s have 50V caps. My Mtroniks has a "25/085/21 1430"
Not sure what that is, but I would guess a 25V 85C cap.
I would be surprized too that you could not push the voltage a bit. Its not like they would produce a esc righton the edge of specification (at least oyu hope not.) I don't know if you could push 16 or 18 cells, but I do wonder if alot of these esc are built with very simular components and its really the becs that are holding them back. The rec'd here are not to run a Q125 with the BEC w/ high cell counts, yet the esc is listed as such. Who's to say that Quark is just pushing the specs of their esc (knowing bec will prob get disabled) while MGM is not. The fact that it needs an extrenal HS to be reliable suggests they are pushing the design spec to begin with. Not saying its a bad controller, but a $280 esc that still needs a ubec and extra HSF to work as advertized I think clearly demonstrates they are not being conservative with the ratings.
|
On the contrary, the 9920 for instance are only rated for 12 cells on the BEC. A external BEC is required for higher. Let me explain why. The total voltage of the batteries has to go through the BEC or UBEC either way. With a internal BEC, the ESC has a fairly small BEC internally so as to maintain a small ESC, were as obviously, the smaller internal BEC is also gonna have problems disipating the heat. Heat comes to it in the form of watts. Which is gonna be killer on it with a large spike. At least this is how I understand it. Alot of this is still over my head.