Step 1 Choose Inverter

Concept

PA STC PV array capacity (W)

f1 DC/AC ratio (decimals)

Pnom inv Nominal power of the inverter/ Apparent power (only if no active power output provided) (W)

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

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

1.2 Calculate Nt ac pwr

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

f1 DC/AC ratio. Typically, 1.11 (decimal)

1.4 Select inverter model and calculate new f1

Criteria

1. Step 2.3 Calculate Pnom inv

• 1. • Select 40°C in Malaysia because maximum ambient temperature in Malaysia is 35°C

2. Maximum inverter power output/ Maximum active power of inverter/maximum apparent power <= Pout max 

3. New f1 is closed to f1 that given (if any)

No power clipping --> 1.11 > f1

SUNMAN 4.0

1. Nominal power = 4000 W > 3963.964 W

2. Apparent power = 4000 VA = 4000 W

3. New f1 = (22*200) / 4000 = 1.10 (aprroximate to 1.11 given by question)

With power clipping --> 1.11 < f1

SUNMAN 3.6

1. Nominal power = 3680 W < 3963.964 W

2. Apparent power = 3680 VA < 4000 W

3. New f1 = (22*200) / 3680 = 1.19 (aprroximate to 1.20 given by question)