Specifying C21e
Selecting the right system for your project depends on three things:
- The type of tiles or slates you will be using around the C21e tiles/slates
- The size of un-shaded roof area available (length and width)
- And the amount of energy required; larger systems will make more electricity
C21e is compatible with several types of tiles and slates, and should only be installed with one of the following:
| Roof Tile Compatibility | |
| Cemex (Russell) | Grampian, Highland |
| CRH/Northstone (Scott) | Slemish Mk 2 |
| Lafarge (Redland) | Mini Stonewold |
| Lagan | Flat Tile |
| Marley (Eternit) | Modern, Duo Modern |
| Quinn | Western slate |
| Sandtoft | Calderdale, Calderdale Dual |
| Roof Slate Compatibility 600 x 300mm or 500 x 250 mm | |
| Natural Slate | |
| Reconstituted Slate | |
| Fibre Cement Slate | |
| Marley (Eternit) | Birkdale, Garsdale, Rivendale, Thrutone |
C21e slates require a slightly larger roof area than C21e tiles.
Use the following table to work out which size of system will fit the roof and how much energy it will generate. Select the appropriate Product Code to order your system:
| C21e Tile format | C21t Slate format | |||||||
| System Size | Electricity per year (kWh)* | CO2 Offset per year** | Min Roof Length*** | Min Roof Width**** | Product Code | Min Roof Length*** | Min Roof Width**** | Product Code |
| 18 | 777 | 441kg | 3.6m | 3.1m | 10215-02 | 3.8m | 3.9m | 10771-02 |
| 24 | 1036 | 588kg | 3.3m | 4.3m | 10215-03 | 3.5m | 5.1m | 10771-03 |
| 36 | 1554 | 883kg | 3.6m | 5.5m | 10215-04 | 3.8m | 6.3m | 10771-04 |
| 48 | 2072 | 1177kg | 4.6m | 5.5m | 10215-05 | 4.7m | 6.3m | 10771-05 |
| 60 | 2590 | 1471kg | 4.0m | 7.8m | 10215-06 | 4.1m | 8.8m | 10771-06 |
| 72 | 3108 | 1765kg | 4.6m | 7.8m | 10215-07 | 4.7m | 8.8m | 10771-07 |
* For a south-facing roof, generating 830 kWh per kWp
** Using SAP calculation method for grid displaced electricity - 0.568kg per kilowatt hour
*** Measured Eaves to Ridge
**** Measured Verge to Verge
To order your system please visit your local distributor or contact us on: 020 7803 0223 or email installers@solarcentury.com.
The systems can be delivered straight to site anywhere in the UK and contain all the components and instructions for a complete installation split into two packs. The roofer's pack contains the solar electric tiles and other elements for the on-roof work. The electrician's pack contains the inverter, cables and other components to complete the internal works.
Definitions
kWh: kilowatt hours: (the same as 'units' of electricity on your bill) energy generated by the system
kWp: kilowatt peak: The 'peak' power rating of the system under standard test conditions
CO2 offset: Amount of carbon dioxide emissions avoided through on-site generation
