From Hero's Guide by JD Wiker and Rodney Thompson.

Effect: All variable, numeric effects of a maximized Force skill are maximized. This means that the maximum damage is dealt, the maximum protection roll is made, etc. Those that do not have random variables are not affected. If the variable is added to a non-Force roll, that roll is still made as normal. Powers affected by this include Enhance Attribute, Lightsaber Combat, Force Lightning, and Greater Force Shield.

In game terms, the difficulties are doubled and the Jedi must make a Moderate stamina check, +10 for every use, -5 per hour rested, cumulative with other special powers. But every Force die is considered to roll at max, but there is no Wild Die unless rolled with non-Force dice. If the Jedi fails the check all Force powers have their difficulty doubled and the Jedi is considered fatigued until they can rest.

This power is cumulative with Empower Force, which adds one-half the normally rolled value to the maximum normal total.