IRONJ
Can you explain how you load balanced the A/C's? I too have a 3 A/C TH and would like to do the same.
I just did this mod two weeks ago. Hopefully not hijacking this thread too much. In the cyclone it was very easy.
Pull your circuit breaker main box out of the hole. Remove the switch to select the air conditioner. Using fish tape run 12/2 romex from the switch box to the hole for your circuit box. It was about 4 feet on mine. With the breaker box out of the hole you can easily reach the fish tape. You may even be able to run the wire without the fish tape.
Find a spot in the circuit breaker box for a new 20 amp breaker. Pop it in and attach the black wire to the new breaker and the white and copper wires to the appropriate buss bar.
At the light switch you'll see the wire coming from the bottom of the box attach to the middle hot screws. The two wires going out of the top of the box go to each air conditioner. Feed your new wire into the bottom of the switch box. Attach the existing bottom wire to one air conditioner line and the new wire to the other. Now both air conditioners have their own breaker. Cover it with a blank plate and you're all done.
As far as balancing, each of your 50 amp main breakers control 1/2 your circuits. On our boxes they are every other circuit. The top 50 amp main controls the upper circuit breaker. Then skips one, etc. balancing the load simply requires putting loads on every other breaker. You'll notice that each breaker contains two legs. Both those legs are controlled by one main breaker.
Here is an idea of what the breaker box looks like. You can see how every other breaker is attached to the metal rail.
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