General

1. What happens if there is a power cut?

Solar electric systems for homes are entirely grid connected. If there is a power cut your system is automatically switched off. This is a safety measure designed to stop electricity leaking on to the national grid and to protect people who may be working to restore the power supply.

2. How efficient are solar panels?

The 'efficiency' of solar panels is less relevant than you might imagine, because the sun contains an incredible amount of energy! More important is the kW·h/kWp (kilo watt hours (or 'units') per kilo watt peak) you will generate. The government quote this as 850kW·hs/kWp for the UK, but we have seen 1000kW·hs/kWp for some systems in the UK. So if you had a 4kWp system (about 30m²) you could generate 4 × 850 = 3400 units a year (at the government figures), which is more than you need in a 3 bed house with all mod cons AS LONG as you are 'energy aware' and not frivolous with your usage!

3. How can the energy benefits of the system be maximised?

Orientation, shading and the temperature of the solar system all impact on the output and must be considered at the design stage. The best orientation for solar panels in the UK is south facing but performance is still very good at any direction between SE and SW. The ideal roof angle is somewhere between 30 - 40°. Of course, the more energy efficient the building, the greater the overall benefit of the solar energy system.

4. Can you supply me a solar PV energy system outside of the UK?

No. We are not able to supply outside of the UK.

5. Do you sell solar thermal?

No, sorry we don't.

6. Do the PV panels need direct sunlight to work?

Solar PV energy panels work from daylight. Obviously they produce more power when the sun is stronger, as opposed to when it is overcast. Shade is to be avoided.

7. What happens at night?

At night, when the solar roof is not generating electricity, you buy electricity from your supplier like normal.

8. Does the glass front of the panels reflect light away?

Solar panels use a low iron glass with an anti-reflective coating. These features greatly increase the amount of light reaching the solar cells.

9. How much energy will I generate?

This depends on the size of the solar PV energy system installed

10. Are there different types of solar systems?

There are two distinct types of solar system you can install on your house: Solar thermal for making hot water. Solar electric panels (also known as 'photovoltaics' or 'PV') which make electricity. Solar Technology International Limited only offers 'photovoltaic' or solar electricity systems; we do not provide solar thermal systems.