[Russ Beavis]

Simple physics - where does the energy go? It's certainly not recharging the battery since the 120A main breaker is open. So... something is going to get warm and/or generate light (kinda like a different type of "warm" actually). At some power level (energy per unit time), that extra heat will cause a failure.

Try pushing a robot that's powered on (with actuators disabled for obvious safety reasons). Then try pushing a robot with the main breaker open. Any difference? There probably will be since more of the energy will be used to recharge the battery.

Good lessons to learn. But, to Eric's point, be gentle to avoid harming your robot. And never play around with enabled robots.

Russ