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What is a feed-in tariff?
A feed-in tariff is a fixed rate per unit of electricity paid by your main provider for electricity generated by your PV array, as determined by the government. This will be be introduced in April 2010, and is set to be 41.3p per kWh generated by the solar array, for systems under 4kW installed before 31st March 2012. For systems installed after 1st April, the rate will reduce to 37.8p per kWh. Systems larger than 4kW will qualify for a tariff of 36.1p per kWh, reducing to 33p per kWh thereafter. In addition any surplus energy exported to the national grid can be sold for a minimum rate of 3p per kWh. The tariff is for 25 years and is tax free.
What is the payback time on the system?
The payback period, defined as how long to recoup the money spent on the system in terms of savings make on electricity costs, will vary considerably depending primarily on the future cost of electricity, and the size of your system which attracts the new feed-in tariff system. Based on current average electricity costs, and assuming modest inflation of energy prices, the payback period on this calculation alone should be anywhere between 10 and 15 years, although the introduction of the feed-in tariff at 41.3p per kWh will reduce the time further. This payback calculation also ignores any added value the system may add to your property. Try using our Payback Calculator on System Costs for illustrations. You will also be reducing your carbon footprint for many years to come.
How can I see how much electricity I am saving?
As part of the system, we provide a solar powered wireless data monitor, to be used in the house, which records and stores data collected from the PV array, so you can easily see what power is being generated and how much energy you are saving.
Do I need planning permission to install a roof mounted system?
No. You do not need planning permission to install a roof mounted solar PV system, unless you live in a listed building. However, it is always worth checking with your local authority.
How much maintenance does my system need?
PV systems need very little maintenance, we recommend that you simply regularly keep your solar panels clean and check that there is no shading on the panels. Any wiring or system components should only be checked by a qualified technician.
How long is my PV microgeneration system guaranteed for?
The power generated by the system is guaranteed for 20 years, although should have an operation life of at least 30 years. Some parts, such as the inverter, may need replacing over that period.
Does my solar array need to be south facing?
The solar array should ideally be south facing, or primarily south facing, otherwise there will be an appreciable reduction in power generated over the course of the year. Please note also your array should be sited so there is no shading during the day from nearby buildings, walls, trees etc.
Do PV systems make any noise?
No, one of the great advantages of PV versus wind is that it is silent.
Is the system safe? I am worried about having an electricity generating system in my garden with children or animals around?
The PV system is totally safe, as long as correctly installed. We strongly recommend that armoured cabling is used to carry the power from the solar system to the consumer unit and that the cables are routed with safety in mind in order to comply with building regulations.
Can I store the electricity generated by my PV system?
No, the electricity generated must be used during the day in the house, or exported back to your electricity provider.
Is my roof strong enough to support a roof mounted system?
Your roof needs to be able to withstand the weight of the solar array. We can advise on viability from information you supply us, but if you are unsure, please consult a local builder or construction expert.
Do I need to insure my PV system?
Yes, you need to check with your insurance provider that your policy covers this.
Do I need planning permission to install a ground mounted system?
You do not need permission as long as you fulfil the criteria stated in our Planning section. Our standard system meets the size criteria to avoid the need for planning permission, however the proposed location of the system in terms of conforming to the rules remains your responsibility. If you are in any doubt, we advise that you contact your local planning authority.
Can I claim for more than one installation at my property?
No, unless it is for a different technology.
How long will the PV microgeneration system remain effective for?
The power generated by the system is guaranteed for 20 years, although should have an operation life of at least 30 years. Some parts, such as the inverter, may need replacing over that period.
Can I extend my system at some time in the future?
PV systems are modular, hence readily expandable, subject to space criteria. If additional solar panels are added in the future, the inverter will probably also need to be changed to accommodate a larger power supply. System extensions will not qualify for additional capital grants, but should qualify for the feed-in tariff when introduced.
Will my PV system supply all my hot water?
No, a solar/PV system generates electricity, not hot water. If you are interested in using solar to generate hot water, you need a thermal system. Smart Solar does not currently supply thermal systems.