Outback Power Systems FW-X240 Installation Manual - Manual (Page 12)

11
LOAD L1 120VAC LOAD L2 120VAC
500 WATTS 4500 WATTS
TO LOADS
500W
TO LOADS
4500W
25 AMP 25 AMP
2500W 2500W
WHITE WHITE
120V 120V
25 AMP
2000W 2000W
RED BLACK
X240
AC NEUTRAL BUS
Figure 7: FW-X240 Installation Balancing Two FX Series Inverter/Chargers (OutBack Stacking)*
* Figure 9 shows current fl owing from the L1 FX through the FW-X240 to run in parallel with the L2 FX
output. The L1 inverter is producing almost half of the power required to power the load on L2 and
at the same time is supplying power to its own L1 load.
• When both FXs are awake and producing power, a 240 Volt load will be powered by both inverters
equally.
• If there is less than 1000 watts on L1, then the L2 FX will go to sleep. The FW-X240 is still active and
producing 240VAC.
• A small 240VAC load would be powered from the L1 inverter and the FW-X240.
• A large load turning on will wake up the L2 FX. The L2 inverter will go back to sleep as soon as the
large load on L2 goes away.
Note: Systems with more than four FXs might require two FW-X240s in parallel and require 35 amp
breakers as well.