Energy draw from various systems

[Magrim]

I've googled, looked through the wikis and browsed the forums but cant seem to find the answer. I would like to know exactly how many points of energy each ship system uses to operate . For instance, I have heard (somwhere) that for 1 point of shield regen it uses 1 point of energy from the pool. Is this correct? And what about am cannons and thrusters? The reason is if im running full tilt, firing my cannons with my shields regening, i would like to know that my cap will hold.

Thanks, and what an amazing game.