5. Factors affecting performance Pitch and direction of panels Shade Temperature (drop off above 27°C) Amount of light Renewable Energy 7 October 2011
6. Factors affecting performance Amount of light (lumens) Example: Rustling, High St, Elham Weather and solar PV performance (1=best, 4=worst) 1 Sun 2 Sun & Cloud 3 Cloud 4 Rain 53.2 Sun Cloud/rain Cloud/ more rain 24.7 Power generated (kWh) 14.9 25 26 27 May 2011 Renewable Energy 7 October 2011
37. Community investment ?Thank you for listening Solar PV presentation created by Graham Blythe and Scott Jagger Renewable Energy 7 October 2011
Notas do Editor
Solar ElectricityDaylight is energy – Solar Panels convert this energy into either electricity or heat.I will concentrate on electricity today – This means Photovoltaic (PV) Panels.
Now is a good time to install solar PVSolar panel prices have fallen by 33% this year and are expected to fall a further 15% by the end of the yearThere is currently a boom in installations to beat the government’s review of the feed-in tariff (FIT) in April next year
How it works:The electricity produced is fed into an Inverter which modifies the electricity into a format that exactly matches mains power from the grid. It can now be used by you or be exported to the grid.
Factors affecting performance include:Pitch and direction of panelsShade:Temperature:Amount (or quality) of lightRegarding shade:A smaller system avoiding a shady section of roof can generate more electricity than a larger one including it.Regarding temperature: Performance drops off above 27°C. Fortunately, from our figures so far, this does not appear to be a significant factor here.
Now to amount (or quality) of light.This is largely dictated by the weather.From data collected at Rustling, a house here in Elham, a bright sunny day is best and a dark, rainy day is worst.In May 2011, the system generated 53.2 kWhs on the 25th, a bright, sunny day. It fell to 24.7 on the 26th, which was cloudy with some rain; and dropped to 14.9 on the 27th which was an even darker and rainier day.What is a kWh? A kWh is one unit of electricity.In real life:One full dishwasher load is 2 unitsOne full washing machine load is 10 units1 hour’s ironing is 0.5 units
There are several advantages to this form of renewable energy generation. Appearance – is it offensive to the eye? I would say no, but some would disagree Environment – whilst producing power does it use up our worlds resources? no Financial – are there benefits to individuals and communities? YesWe will now look at these advantages in more detail
The location and appearance of the installation will be governed by Planning Regulations.We’re in a conservation area so if the panels are visible from the street, planning permission will be required. Listed Buildings are more difficult.The position on a roof is subject to regulations so be sure these are followed.- If there is deemed to be significant change to an aspect of the property, this will have implications too.- It’s always worth asking the planning authority. If planning permission is required it will cost £150 but it will help remove any later complications which could be costly.
Now to the environmental advantages:For every kWh of electricity generated approx ½ a ton of CO2 is saved.
Financial advantages: the Feed-in Tariff (FIT) means that:You will receive a Generation tariff for electricity you generateYou receive an additional Export tariff for electricity exported to the gridGenerated electricity is free to useThe generation tariff still applied even if you use the electricity yourself
Depending on the size of the installation your electricity supplier will pay you a generation tariff of between 32.9 – 43.3 pence per unit generated. This is guaranteed by the government for 25 years and is index linked.
You will also be paid an Export TariffSurplus electricity is fed in to the grid and your supplier pays you for it (currently 3.1 pence/kWh)The advice is that you should use as much of your own power and as little of your supplier’s power as possible as the export tariff is much lower than the import tariff from electricity suppliers. Run electrical appliances during the day, not the night.There are 2 options for setting up the export tariff: A precise, metered system or a percentage of the total power you generate. For most domestic systems, the percentage route will be best.
When all the property’s requirements are not met by PV generation, the deficit is imported from the grid at normal metered rates. Please note that at night all the property’s requirements are imported.
This slide shows the potential Costs and Savings of a possible installation at a commercial or community site.This example of 63 panels and an installation cost of £56,000, would generate an annual income of £5,000, which would result in…
A potential income over 25 years of £227,000.This figure takes into consideration – Loss of efficiency of the PV Panels – from 100% to 80% efficiency after 25 years.- An Annual Inflation Rate of 3.8%- Annual increase in Energy Costs of 10%
How would the community benefit from a community project?This needs to be discussed with the owners of the community buildings to ensure benefit for both the community and the owners. Community investment There may be a situation where a project needs funding through private individuals. In this case there would be a need for a Share return for those individuals, thus a three way benefit for Owners, Investors and the Community. Thank you for listening and I would like to thank Graham Blythe for helping put this presentation together.
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