IEA PVPS Task 2 Performance Database Example
Plant name : Hanyu city
Start of plant operation : 1998
Type of plant : Grid-connected
Type of use : Residential house
Mounting : Sloped roof
Nominal peak power : 2.90 kW
Location : Hanyu city, Saitama prefecture, about 50km north of Tokyo
Country : Japan

Year       1998   1999   2000      
Availability of monitored data 0.50 0.94 0.92 AMD [ ]
Meteorology      
Annual irradiation, 
in array plane		 548 1 258 1 287 Hi [kWh/mē]
System Energies      
Annual a.c. energy output  1 249 2 911 2 902 EIO [kWh]
Annual useful energy 6 464   13 568 13 339 Euse [kWh]
PV array fraction 0.21 0.23 0.23 FA [ ]
Annual energy consumption 6 085  12 565  12 343 Econ [kWh]
 
System performance Indices            
Daily reference yield 2.99 3.68 3.81 Yr [kWh/kW]
Daily final yield 2.35 2.93 2.96 Yf [kWh/kW]
Daily array 
capture losses		 0.46 0.52 0.62 Lc [kWh/kW]
Daily system losses 0.18 0.23 0.22 Ls [kWh/kW]
Annual performance ratio 0.79 0.80 0.78 PR [ ]
Annual array efficiency 11.2 11.4 11.1 hA [%]
Annual inverter efficiency 92.9 92.8 93.0 hinv [%]
Annual overall plant efficiency 10.4 10.6 10.3 htot [%]
Utility Grid
Annual energy to utility grid 379  1 003  996 ETU [kWh]
Annual energy from utility grid 5 215  10 657  10 437 EFU [kWh]

This is a typical example of residential grid-connected PV systems in Japan, located in Hanyu city, Saitama prefecture, about 50km north of Tokyo. The system was installed in January 1998, using the subsidiary money of the residential PV monitoring programme from NEF (New Energy Foundation). The monitoring of operational data has been started in March 1998 under the detailed performance monitoring programme conducted by JQA (Japan Quality Assurance Organization) and funded by NEDO (New Energy and Industrial Technology Development Organization).

The PV array is installed on the sloped roof facing south and covered by traditional roof tiles. The annual performance indices are slightly better than the average values of Japanese residential PV systems due to th good surrounding conditions and proper system design.

The solar coverage (PV energy output / total energy consumption by the household) for this system is about 23%, which is well below the average annual value of 47% for 85 well-monitored residential PV systems in Japan. There is a very large dispersion in solar coverage values for these 85 PV systems from less than 10% to greater than 130%. These rather low solar coverage values are due to the fact that the average annual consumption (6 750kWh) is about 1.5 times larger than the national average for all the residential houses.
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modified on 02/14/05