Engine Dyno - VFD Continuous Dynamic Braking Question

Engineers of Reddit:

I'm working on a plan to replicate the effect of very expensive equipment using a creative application of AC motors and VFDs. Basically, I'm looking to create a small engine AC dynamometer. The current plan has a 7 HP engine driving an AC motor. The AC motor's braking load is being controlled by a data acquisition system which is feeding the VFD with an analog input of drive frequency (0-60 Hz). By varying the drive frequency below the speed at which the engine is driving the motor, braking load can be varied.

Excess power (roughly 7HP continuous, worst case) needs to be delt with. Dynamic braking in the VFD would require a braking resistor rated for a 100% duty cycle at these power levels. For the sake of today, lets say that regenerative braking back to the grid isn't possible. I've also thought of using a second VFD and centrifugal pump connected with a DC common bus to circulate some water in a tank (existing) through a restriction to utilize the generated electricity.

If I wanted to stick with the simpler dynamic braking situation, what should I select for drive, motor, and resistor sizing? Something like 10 HP motor, 10 HP drive, and unknown resistor (Or will I need to oversize the drive or other components to handle the duty cycle)?