Solar Calculator
How to use the TGE Solar Calculator:
1. Choose an example system from the drop down menu and click Select
2. Adjust your roof angle, orientation and shadowing
3. Click Calculate
4. Enter your price for electricity (or assume 14p)
5. Estimate how much will be used in the house/exported (or assume 50%)
6. Select VAT rate (5% for domestic & 20% for commercial)
7. Click Calculate
Example Systems
Solar Prediction
2.00 kWp System
Size: 2.00 kWp
Panels: 8
Panel Size (W): 250
Roof Array Size (m2): 13
Installation: £5311
(scaffolding included)
Cost per kW: £2655
2.50 kWp System
Size: 2.50 kWp
Panels: 10
Panel Size (W): 250
Roof Array Size (m2): 17
Installation: £5994
(scaffolding included)
Cost per kW: £2397
3.00 kWp System
Size: 3.00 kWp
Panels: 12
Panel Size (W): 250
Roof Array Size (m2): 20
Installation: £6676
(scaffolding included)
Cost per kW: £2225
3.75 kWp System
Size: 3.75 kWp
Panels: 15
Panel Size (W): 250
Roof Array Size (m2): 25
Installation: £8281
(scaffolding included)
Cost per kW: £2208
4.00 kWp System
Size: 4.00 kWp
Panels: 16
Panel Size (W): 250
Roof Array Size (m2): 27
Installation: £8591
(scaffolding included)
Cost per kW: £2148
5.00 kWp System
Size: 5.00 kWp
Panels: 20
Panel Size (W): 250
Roof Array Size (m2): 33
Installation: £10104
Cost per kW: £2021
7.00 kWp System
Size: 7.00 kWp
Panels: 28
Panel Size (W): 250
Roof Array Size (m2): 46
Installation: £13816
Cost per kW: £1974
8.00 kWp System
Size: 8.00 kWp
Panels: 32
Panel Size (W): 250
Roof Array Size (m2): 53
Installation: £15127
Cost per kW: £1891
10.00 kWp System
Size: 10.00 kWp
Panels: 40
Panel Size (W): 250
Roof Array Size (m2): 200
Installation: £19404
Cost per kW: £1940
50.00 kWp System
Size: 50.00 kWp
Panels: 200
Panel Size (W): 250
Roof Array Size (m2): 413
Installation: £86580
Cost per kW: £1732
Financial Returns
The Government Feed-in Tariff (FiT) is a premium payment for every unit of electricity that is generated by your solar pv system. The Feed-in Tariff is tax free to domestic households, index linked for both commercial and domestic installations and guaranteed for 25 years. The FiT is paid out by your chosen electricity supplier.
Our Solar Calculator output is based on the Government's SAP 2010 statistics. The Savings on Electricity section is based on what you currently pay for electricity and what percentage of your solar electricity you might use or export in your house.
Proposed FiTs payable from 3 March 2012 until 1 April 2012. Current feed in tariffs payable until 3 March are shown in brackets
21.0p per unit for systems up to 4kWh (43.3p(retrofit)/ 37.8p(new build))
16.8p for systems 4kWh - 10kWh (37.8p)
15.2p for systems 10kWh - 50kWh (32.9p)
12.9p for systems 50kWh - 150kWh (19p)
12.9p for systems 150kWh - 250kWh (15p)
8.5p for systems 250MW - 5MW (8.5p)
Additional 3.1p bonus will be awarded for every unit of electricity exported.
See our press release for full details of the new FiT proposals.
