If Kuma was human, he would wind easily. Wipe out the floor with Enel, actually. This is because Enel illusions of greatness, considering himself a god. He would greatly underestimate Kuma. Kuma would then attack quickly and deadly. Kuma is also smarter than Enel,and would most likely find his weakness before Enel could find a way to beat him.
Against direct lightning, Kuma would just push it away while I don't think Enel can counter a direct push from Kuma. Even without Haki, the way Kuma's power works makes it perfect against pretty much anything.
The problem is, Kuma is now a robot. A mindless robot. As such, he would have a great weakness, as Enel's lightning would scramble Kuma's circuits and would lead to it's demise. The problem is, would Enel step out of it's pedestal and actualy create a good strategy to do so, or would just succumb before he could figure out Kuma's weakness?