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Solar performance

Two members of the Solar Group had a one-kilowatt PV system installed at their Strickland Ave home in April 2008. Over the next twelve months they recorded daily readings of electricity generation from their inverter, as well as their daily electricity consumption. Together with careful use of electricity, they found that their solar system provided them with two-thirds of their annual "Light & Power" electricity consumption. If you include their electric heating consumption, the solar system provided one-third of their total electricity use. 

Here is a chart and table of their monthly results measured in kilowatt-hours (kWh). Below these are more details in the notes.







Date

Solar

Light & Power consumption

Solar as % of Light & Power consumption

Total consumption

Solar as % of Total Consumption

2008

APRIL

3.1

6.5

48%

12.5

25%

MAY

2.0

9.3

22%

15.3

13%

JUNE

1.7

6.5

27%

12.5

14%

JULY

2.1

8.2

26%

14.4

15%

AUGUST

2.7

8.3

33%

14.2

19%

SEPTEMBER

3.7

7.5

49%

13.1

28%

OCTOBER

4.4

4.7

92%

10.5

42%

NOVEMBER

4.4

2.4

181%

5.9

75%

DECEMBER

5.1

2.4

207%

5.5

93%

2009

JANUARY

5.5

2.1

258%

6.0

92%

FEBRUARY

4.0

2.5

163%

6.9

58%

MARCH

3.3

2.5

131%

5.5

60%

Average

3.5

5.2

67%

10.2

36%


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Notes:

System: 1kW (6 panels x 150 watts = 1050 watts), mounted at 20 degree pitch facing NNW.

Household: Two person household, both working full-time so majority of energy consumption in evenings and on weekends

House type: Three bedroom home of approx. 100m2, weatherboard construction with electric storage hot water system

Annual consumption: for the first full year that the Solar PV system was installed was 3580kWh (1670kWh–Hot Water and 1910kWh–L&P), which is 

roughly 36% of the average for Tasmanian households of 10,000kWh (2500kWh– Hot Water and 7500kWh–L&P). 

The line on the chart for total consumption includes the usage of Hot Water, which is metered separately as it is on Hydro heat tariff.


Key message: the findings underscore the importance of also switching to Solar or Heat Pump Hot Water as part of a household’s overall energy efficiency 

strategy. A 1kW Solar PV system will not generate entire energy needs but can generate a significant portion of Light and Power usage (in this case just over 2/3rd

if energy efficiency measures are also undertaken.


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