ORIGINAL: dynoflux
With the b17 I used one battery pack to power all 4 controllers/motors. I used #12 wire from the battery to the inboard motor/controller and #14 wire from inboard to outboard. Use high quality silicone wire as it will not melt if you over current it. Never fly the airplane to the point of low voltage cutoff due to wire, connector, and electronic component tolerances one speed controller will always quit before the others. I start with short flight and measure the amount of power left in the battery; in about 3 flights you will be able to find a safe time limit for your flights.
If you use E-Flight speed controllers it may be a good idea to contact Horizon and ask for advice about parallel connection of BECs. Castle Creations use standard voltage regulator circuts on their controllers; since this the also the easiest solution E-flight may do the same making parallel BECs ok. With my E-Flight Super Airliner the instructions advises to connect speed controllers with standard Y connector; no mention of disabling one BEC.
Nice fleet of planes
Effectively, I will also be using one battery(at least the esc's will see it as one battery since 5 TP2100s will be set up in parrelel). So, you basically wired all your esc together(the battery connections) and then simply y-connected the throttle leads? Wouldnt that overvolt the receiver and servos?