Cost of installing solar PV panels 2010
3.94kWp system
A 3.94kWp system will give roughly 3200kWh per year of electricity, depending on where you live, if on an unshaded south facing roof. This is documented as the average UK household electricity use, this can be found by looking at electricity bills.
As it is under 4kWp it is also in the highest Feed-in-Tarrif bracket of 41.3p per kWh.
So for a 3.94kWp system the costs would be:
System cost about £15,000
Building Warrant £325 - £340 in West Lothian in November 2010
Giving a total of less than £16,000
Pay back would be:
3200kWh of electricity paid at 41.3p = £1321.60
if half used = saving of 1600kWp @ 12p per unit = £192.00
Other half put back to grid = 1600kWh @ 3p = £48.00
Total annual saving = £1561.6
This gives a 10 -11 year pay back depending on where the inital £16,000 was sourced and any interest paid or lost on it.
The remaining 14 - 15 years of the Feed-in-tariff are profit.
As it is under 4kWp it is also in the highest Feed-in-Tarrif bracket of 41.3p per kWh.
So for a 3.94kWp system the costs would be:
System cost about £15,000
Building Warrant £325 - £340 in West Lothian in November 2010
Giving a total of less than £16,000
Pay back would be:
3200kWh of electricity paid at 41.3p = £1321.60
if half used = saving of 1600kWp @ 12p per unit = £192.00
Other half put back to grid = 1600kWh @ 3p = £48.00
Total annual saving = £1561.6
This gives a 10 -11 year pay back depending on where the inital £16,000 was sourced and any interest paid or lost on it.
The remaining 14 - 15 years of the Feed-in-tariff are profit.
7.05kWp system
A 7.05 kWp system will give roughly 5500kWh/year of electricity on our roof. Again this will vary depending on where you live, the slope of your roof and the way the roof faces. As it is a system between 4 and 10 kWp it attracts a feed-in-tarrif of 36.1 pence per unit.
The cost to install as of September 2010
System cost = £22847. 40
G59 switich = £1,500
Building warrant = £460.00
Scottish Power G59 assessment = £734.66 (as of Oct 2010 I understand it is £850)
Hireing G59 testing equipment = £500.00
Total = £26,042.06
Payback should be:
5500 kWh per year at 36.1p = £1985.50
if half used saving 2750kWh per year @ 12p per unit = £330
if half put back to grid 2750kWh per year @ 3p per unit = £82.5
Total annual saving = £2398.00
This also gives a 10 - 11 year payback depending on how you fund - through loans, savings grants etc. Our figures will be different to this as we predict we will use a higher proportion of our electricity due to having an air source heatpump.
The cost to install as of September 2010
System cost = £22847. 40
G59 switich = £1,500
Building warrant = £460.00
Scottish Power G59 assessment = £734.66 (as of Oct 2010 I understand it is £850)
Hireing G59 testing equipment = £500.00
Total = £26,042.06
Payback should be:
5500 kWh per year at 36.1p = £1985.50
if half used saving 2750kWh per year @ 12p per unit = £330
if half put back to grid 2750kWh per year @ 3p per unit = £82.5
Total annual saving = £2398.00
This also gives a 10 - 11 year payback depending on how you fund - through loans, savings grants etc. Our figures will be different to this as we predict we will use a higher proportion of our electricity due to having an air source heatpump.
