I do apologize for taking so long, I was watching a movie (Beautiful Creatures) in the next room.
There are no longer any chips or circuits available in REOS, they are all strait mechanicals now. There used to be VV Grand made, with circuits made by BuzzPro, but the owner of REOS Mods was unhappy with the durability. I have two, for over a year now, and no problems from mine. But Rob is real picky about what he makes.
As far as output- (V X V) divided by Ohms. Your variant would be the resistance of your coils. Other than that, it's a strait draw off of an onboard battery. I usually shoot for about 1.5 ohms on my Grand, so... (3.7 X 3.7) = 13.7. Divide by 1.5 = about 9 watts direct Wattage.
I don't know if that helps, but it's the best I can offer. More, smarter people in REOVille.