Welcome to the forum 
that depend of the consumption of each module
look here some numbers
you can counted near 50mA for each module
on the FC website :
" FC Power works from a 12V/1000mA AC wallwart and provides ~500mA at +/-12V, ~100mA at 5V (optional)."
so near of 10 modules for each FC power supply (except if this is 10 Safety Valve ahah )