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112 INTRODUCTION TO SOLAR POWER SYSTEM DESIGN
Figure 4.13 Two-axis tracking array.
■ The inverter manufacturer (must be listed on CEC-approved equipment)
■ Inverter model number and number of units (total output capacity)
■ Inverter efficiency in percent
■ Maximum site electrical demand load
Upon completion of the parameters, project incentive and cost calculations are cal-
culated using the following formula:
Total eligible rebate watts (TERW) = Total sum of PV PTC watts × Inverter efficiency
The total rebate amount is calculated by multiplying the TERW by the rebate per
watt amount.
The following example demonstrates the eligible rebate amounts that can be
expected from Southern California Gas Company. Let’s assume that a solar power
platform provides an unshaded area for a quantity of 530 SolarWorld modules (model
SW 175 mono) and a properly sized inverter is selected from a manufacturer that has
been listed under CEC-approved solar power equipment. The rebate application cal-
culation will be as follows:
■ PV module: SolarWorld model SW 175 with dc-rated output of 175 W
■ PV module PTC power output rating: 158.3 W
