Step 5 AC Power Constraint

Concept

PA STC PV array capacity (W)

Pout max Maximum allowable AC power limit injected into the gird by the authority , ≠ PmaxSTC (W)

f1 DC/AC ratio. Typically, 1.11, refer to Energy Hub - Step 2 Choose Inverter (f1 Ratio)  (decimal)

Nt ac pwr Total number of PV modules based on AC power limit (units)

Pmax STC Peak power of PV module at STC (W)

5.2 Assume f1 = 1.3

• 26 units of PV modules may generate power which higher than maximum power rating of inverter.

• If the power that generated from PV modules > maximum power rating of inverter, the inverter will clamp or clips to limit AC power flow into grid.