What is even the the point of that? An always-on (presumably only on during daytime?) 1 MW motor with enough solar panels to power them and something that actually requires a full megawatt would be pricy enough that the cost of an inverter would not be all that large percentage wise. Especially since you almost certainly would want to have some sort of controller for the motor anyway, which would need the same type of electronics as an inverter would need.
