Lilredmachine

The Excelorin is overrated.

Escs have fets in, they are what handle the power. Some manufacturers take the direct amp ratings of the fets and use them as a continuous current rating. The fet rating is often taken at a low temperature, say 25 degrees c, which no system runs at no matter how cool running it is. When fets heat up they lose a dramatic amount of their amp handling capability, say 35%. This means you get an unrealistically rated esc that may be able to theoretically take 150 amps, but in the real world will struggle with anything over 100 amps when at normal operating temperature. The MMM on the other hand, is only rated to 120 amps, but that is not only realistic, but conservative. The MMM has taken huge motors, even seen a Neu 1527 run on one without problems. All the issues with the various versions of the MMM have come from trying to make it too small, components too close to each other, the switching BEC, pressure on the wrong parts of the PCB, heatsinks touching motor/battery outputs/inputs and now those are all fixed in the V3. The MMMs amp handling capability has never been in doubt.

The other point is voltage, as you mentioned the Excelorin can take 5s and the MMM can stomach 6s. This means that the MMM, when compared to the Excelorin, has to deal with less amp spikes at it's maximum voltage. To give you an example, a 6s controller in a 1/8th application really needs to be able to handle 150 amps comfortably to give head room, a 10s controller may only need to handle 110 amps due to the efficiency of the system being higher.

As for maximum input from the battery and maximum output to the motor, the ESC these days tends to be the bottle neck. Good lipos are capable of supplying 200a continuous and high end motors are capable of pulling that out of the packs during heavy use, not to mention the stress that braking all that puts back through the ESC. Don't worry about the MMM not having the guts to give the motor what it needs, it will.