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Author Topic: Solar PV – Frequently Asked Questions and Answers  (Read 17180 times)
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« on: April 25, 2013, 02:45:24 PM »

The following is a list of general topics and questions that regularly get asked on the various Navitron solar PV threads. All of the advice comes from enthusiastic PV owners. It should not therefore be considered technically perfect, nor 100% accurate. It should only be considered as shared advice and experiences.
Also please note, there is no such thing as a simple question (nor a simple answer), this post is only meant as a first port-of-call, you will always learn more by chatting on an appropriate thread and gaining additional input and opinions.

Please point out any posts that you think it would be helpful to add to a particular subject, or any additional subjects that could be added to the list.

Thank you.

1. I’m only thinking about getting PV – What should I consider?

2. I want to get PV installed – How do I go about it / What should I do next?

3. Now I have PV – How do I get the most out of it?

4. My meter is running backwards – Do I need to do anything?
4.a. My meter is recording export as import?

5. Estimating generation – How do I estimate my monthly/annual generation or check that my system is performing correctly?

6. Energy monitors – How do they work / Should I get one?

7. I’ve had PV installed – But what exactly are all the parts called / What do they do?

8. Getting serious with circuits - some DIY ideas for the less technically challenged.

9. Feed-in-Tariff registration and changing suppliers.

10. Adding to an existing PV system, or adding an additional PV system at the same address.

11. Common terms and acronyms used on this site in conjunction with PV and renewables in general.

12. FiT degressions.

13. Basic consumer advice and protection.

1. I’m only thinking about getting PV – What should I consider?

Spend some time researching PV on the internet. (Please note that this thread refers to solar PV which generates electricity, not solar thermal which generates hot water.)

Some handy links:-

The main Navitron site gives information here:

Introduction to Solar PV

Solar Photovoltaic Panels (history, background and basics)

Feed-In Tariff FAQ

The Energy Savings Trust website gives information here:

Try speaking to somebody nearby who has had an install, hopefully they will be happy to explain what is needed and their experiences.

An ideal roof will be South facing. The further from South that the roof orientation is, the less efficient it will be. South East and South West roofs will generate about 10% less than South, East and West roofs will generate about 20% less than South.

Shading can have a large impact on generation, especially during Winter months when the sun is lower in the sky. Consider neighbouring structures and trees.

Savings and income: There are 3 sources and they are all tax free:-

1. The Feed in Tariff currently (1/4/18) pays 4.01p* per unit (kWh) generated for installs that are 10kWp or smaller. This amount is index-linked and runs for 20 years. [Note: The rate will be degressed on 1/7/18]

2. The export tariff pays for exported units, 5.24p/kWh. For most installs this will not be accurately measured, instead it will simply be estimated/deemed at 50% of generation.

information on FITs and the export rate can be found at

*another OFGEM document suggests differing FiT rates

3. Savings on your electricity bill. Consuming electricity that is being generated by the PV at that specific time, will save you importing as much electricity from your energy supplier. The amount of savings will depend on the size of the PV system installed, how much electricity you use, and importantly, whether there is much electrical consumption during the working day, when the PV is generating. Savings will vary from household to household, but could be approx. £100 (probably in the £80 to £160 range). Larger savings are possible, but will require higher daytime consumption.

3. (cont) Beware quotes that give overly optimistic levels of savings, higher savings are difficult (for most) and require increasing effort. Also, for electricity customers who pay via a two tier tariff scheme, PV will be reducing consumption 'off the top' so estimated savings should be based on lower tier 2 prices, not higher tier 1 prices (refer to your charges). Similarly, some quotes project enormous savings in the future via compounding large annual bill increases for the whole 20 years. Do not be misled, future prices remain an unknown, for decision purposes only expect reasonable annual savings. Ask PV'ers for their experiences.

Workthrough, please note that this is only an example, and should not be assumed to relate to your proposed installation.

South facing install in Birmingham area. Size of install is 4kWp unshaded, generating an estimated average of 3,600kWh's pa.
FIT income - 3,600kWh's @ 4.01p = £144.36
Export income at a deemed 50% of generation - 1,800kWh's (3,600kWh's/2) @ 5.24p = £94.32
Leccy savings - between £80 to £160  = £120
Total - £145.44 + £90.54 + £120 = £358.68

Many Pv’ers are reporting a 4th source of income/savings. They have found that a better awareness of electrical generation and consumption, has led to a small reduction in demand, regardless of how conscientious they thought they were before installing PV.

Maintenance and upkeep: Solar PV needs little maintenance - you'll just need to keep the panels relatively clean and make sure trees don't begin to overshadow them. The panels should last 25 years or more (hopefully 40+), but the inverter is likely to need replacing some time during this period, at a current cost of around £600 to £1,000.

There should be no change to your buildings insurance, but check with your insurer, and notify them of the PV install.

To qualify for the higher rate of FITs, you will need to obtain an Energy Performance Certificate of D or better on your property, towards which the PV itself can contribute. For more information see the DECC website above.

You can't move your install if you move. So it's important to consider and compare the lengthy payback period of the PV alongside your long term plans to remain in the property. Whilst the FITs income will remain with the property for the full 20 year period, this doesn't mean that any prospective buyer will necessarily want, value nor appreciate the PV system. There is simply no way to guess what the effect of a PV system will have on the final price of your property, it will depend entirely on the buyer in question.

If you are thinking about investigating PV further, then take a look at item 2 on the index.

2. I want to get PV installed – How do I go about it / What should I do next?

Here's a tip sheet

If possible have a good chat with someone that already has PV. Ideally, speak to a neighbour / someone nearby. Most PV'ers will probably be happy to have a chat and show you all the bits and bobs.

Get as many quotes as you feel comfortable with (2 minimum). Ask for company recommendations from friends, neighbours or individuals on sites such as this. However, beware any individuals that may be salespersons in disguise!

For each visit get a written quote that sets out everything that is included, and ask if there is anything that is not included. If you are at all unsure, then use sites such as this, or technical forums to ask for opinions on the system (such as specific panels and inverters). Keep coming back to us for some 'crowd' thinking.

If you are reasonably confident about the size of your roof, and the panel numbers, and orientation that is possible, then you may find it useful to standardize your quotes by asking for a specific system size e.g. 3kWp, and a preferred inverter option (if you have one). But do still ask each representative for their thoughts and suggestions.

Do not underestimate the effects of shading and ask the installer for their views. There are ways to mitigate the effects of shading, such as micro-inverters or power optimisers – ask on thread for thoughts, comments and ideas. Whilst these devices will reduce the negative impact that shaded areas will have on non-shaded areas, they can’t eliminate the problem.

To get a more accurate estimate of the potential generation of your proposed install, try using PVGIS to get a better guess at generation. See index item 5 for more information.

*IMPORTANT* Ask on this forum (or others) for opinions on the price of the install before committing, if you are at all unsure. Prices are in dramatic flux at the moment.

Try not to rush, or be rushed. Take your time and do your research.

Some recent Navitron threads, but please note that both prices and FIT rates keep changing, so up to date advice should be sought:,22589.0.html,21977.0.html,21310.0.html

Solar panels can also be ground mounted, or placed on 'trackers' that follow the sun throughout the day, though this is less common. There are several threads on trackers, the following thread details the construction and installation of trackers by one member (with advice and assistance from a myriad of Navitron members):,16743.0.html

3. Now I have PV – How do I get the most out of it?

Rule 1, don’t get too obsessed, if it’s not fun, then you’re trying too hard!

Rule 2, this issue sits within the question ‘how long is a piece of string?’. There is no short answer, you will need to monitor threads, and chat with fellow PV’ers, exchanging hints, tips and ideas. The following is no more than a very short summary to get you started.

To save money on your electricity bill from PV, then you will need to use the electricity being generated rather than importing it from the grid. Whenever PV is generating it will contribute to your consumption as the household demand will always use PV first before calling on the grid for any shortfall.

PV will contribute to (or cover at higher generation) baseload (fridge, freezer, clocks, answerphones, standby’s, etc) without you making any particular effort.

The next step is to try to run items when generation is higher (the sun is higher or cloud cover is less), this can be achieved more simply if the house is in use during the day, if not, then through the use of timer switches, or programmes on many appliances.

Staggering items can allow you to consume more generation over a longer period. E.g. running 4 large items for an hour may mean that generation only contributes some of the demand, for that 1 hour. Running them separately for an hour each, would allow generation to contribute to the lower demand (at any given time) for the whole 4 hours.

Some recent Navitron threads:,22445.45.html,20883.0.html

Some PV'ers attempt to maximise use of generation (and minimise export of excess) via heating of stored hot water. This will only be possible if your house has a suitable system with an immersion heater. However, this is not easy to achieve and if miscalculated could lead to increased costs e.g. if Gas costs approx 5p/kWh and 'imported' electricity approx 15p/kWh, then if the immersion heater is using 1kW of imported electricity and 2kW of PV electricity, the cost is the same as using 3kW of gas.

There are now several 'intelligent switches' on the market, that monitor export before diverting power to an immersion (or other device). Some of these switches modulate the amount of power going to the device so that it never exceeds spare generation.

Heating of water is discussed here:,19242.0.html,19495.0.html

4. My meter is running backwards – Do I need to do anything?

If your import meter is running backwards, then at some point the meter will need replacing, and the household should expect to have to pay for the imported units that they haven't paid for as they were 'deleted' by exported (backwards) units. Those exported units are already being paid for via export rate at 3.3p (install before 1/8/12) or 4.6p (install after 1/8/12) on an assumed 50% export of generation. Running a meter backwards means that they are being paid for a second time by deleting full price units.

Usually, when applying to your supplier for FITs registration, one of the questions is 'does your meter go backwards'. If you have one of the old-style meters which will run backwards you should answer 'yes'. If the question is not asked in the application form, it is prudent to let them know, otherwise there is likely to be a bill for the assumed extra owing the company when they do find out.

Do not be overly concerned, this is a common issue, but it will need to be resolved. A new meter should normally be supplied FOC.

Some recent Navitron threads:,19408.30.html

Meter displaying rEd:,19818.0.html

4.a. My meter is recording export as import?

Though rare, some people have found that their import meter may be reading the excess electricity that is being generated and exported to the network as if it is being imported.

This appears to be a known 'fault' with some Siemens  meters (possibly S2AS) that have an 'anti-tamper' programme. All the exported units are supposed to be available from an internal register - though you may have difficulty in finding an operator who understands the situation. Your REC's solar energy helpline might be able to help.

Some recent Navitron threads:,15446.0.html

5. Estimating generation – How do I estimate my monthly/annual generation or check that my system is performing as expected?

This site allows you to enter more specific information about your location, and installation:

It's not as bad as it looks. You can play with the finer details all you like, but at first only really need to complete;

Installed peak power – e.g. 3 for a 3kWp system
Mounting position - free standing
Slope – e.g. 30deg
Azimuth (point of reference, the sun) – e.g. for South 0deg, for East -90deg, for West +90deg

Click on the map where you live
Click calculate.

You will then get a page of info, and a table giving an estimate of monthly and annual generation (column Em).

Remember this is only an estimate based on average solar levels of the last 30 years. Generation will vary and will be affected by shading.

There are many weather sites available on the internet, and these can be used to predict short term generation, or to help decide when you think it'll be best to set timers to run appliances etc. You may find it useful to find a site that you are comfortable with, however there does not (at this time) seem to be any one in particular that stands out for recommendation.

At the end of each month you may also want to compare sunshine levels for that month against a 30 year average in the UK. This can be done on this site, just choose the sunshine report map from the list of options.

Some recent Navitron threads:,22513.0.html,22428.0.html

6. Energy monitors – How do they work / Do I need one?

Energy monitors can be used to measure/report the amount of PV being generated.

Do you need a monitor – They are not essential, but if you’d like to know what is being generated at any given time, possibly to help you judge what and when to switch items on (or off), then they can be useful.

There are two main types:

Firstly the more common clamp type. These are relatively cheap, and some energy suppliers will provide them free, or with certain tariff packages. They can also be found for re-sale on popular internet auction sites. It might also be possible to borrow one from your local library, if they offer this service.

These monitors use a ‘clamp’ that is easily fitted around a suitable electrical cable, and relays information on energy flow to the monitor.

At low levels of consumption or generation (less than 300W) these devices can be very inaccurate, but are reasonably accurate above such levels.

Clamp type meters register the current flowing in a cable - regardless of direction of flow. You cannot therefore be sure whether the indication from such a meter where the clamp has been placed in the usually recommended position of the main feed from meter to consumer unit is showing an export or an import. It can help to show which if you have an easily switchable device (e.g. kettle, toaster etc) alongside the meter. If reading goes up when you turn that device on you are importing; if reading goes down you are exporting. But even that has a problem - e.g. if you were exporting 500watts then switch on a 1000w load you'll then be importing 500w but meter reading would stay the same.

With careful planning, you (or an electrical contractor if your own skills not up to it) should be able to arrange your wiring such that you can fit a clamp around a cable in which you know which way the current is flowing. Fitting two (maybe more) such clamps will allow you to measure consumption and generation separately. Most of the cheaper monitors will only display results from one such clamp at a time so you may need to use several of them and perform some quick mental arithmetic to get an idea of net usage (or export).

The Wattson meter

or the OpenEnergyMonitor project

takes that a stage further by displaying a nett figure for you.

Secondly, systems that monitor the flashes from the LED on the total generation meter (TGM). These devices can only be fitted to suitable meters, but provide an accurate report of energy being generated.

Some recent Navitron threads:,17977.0.html,15794.0.html,14759.0.html

7. I’ve had PV installed – But what exactly are all the parts called / What do they do?

The solar panels fitted onto the roof, and convert solar energy into electrical energy in the form of direct current (DC).
The DC is carried by cables to the inverter, and will pass through an isolator switch. This safety switch enables the inverter to be disconnected from the DC side (PV panels).
The inverter converts the DC into alternating current (AC) which the electrical items in a domestic property will run on.
The AC is carried by cables to the total generation meter (TGM), and will again pass through an isolator switch. This safety switch enables the inverter to be disconnected from the AC side (National Grid). On some installs, there may be a small consumer unit installed before the TGM.
The TGM records the amount of energy that the system generates in units. Each unit is 1kiloWatt hour (kWh), (this is the same measure used to record imported units that the household buy from their energy provider, which are recorded on the existing import meter.) It is the TGM reading that will need to reported to your FITs provider in order to get your quarterly payment.
Cables then take the AC to the main consumer unit via another AC isolator switch .

NB: Not all installs will have AC isolators on both sides of the TGM. Some may only have one.

8. Getting serious with circuits - some DIY ideas for the less technically challenged.

Some members have been playing with their soldering irons to solve some PV related issues. If you're a competent DIY'er and can work with circuit boards, or are just interested in such things, then you may fancy a look at the following links;,22092.0.html

9. Feed-in-Tariff registration and changing suppliers

Q. Do I have to register for the FiT with my existing electricity supplier? Or can I pick from any?
A. (short answer) If you're electricity supplier is one of the 'big six' you generally can't register for FiTs with one of the other 'big six'. However if your electricity supplier is one of the smaller (non-'big 6') suppliers, you can choose from any FiT supplier.

Q. Is there any difference between FiT suppliers, for example the amounts I will be paid?
A. Unfortunately yes: there's differences in the following: Service; Registration backlog; speed of payment; method of payment (BACS/Cheque/Credit to bills); 'windows' for submitting quarterly generation readings; methods of submitting readings; some niche providers pay a little extra on top of export tariff.

Q. Once registered for FiTs, can I move electricity supplier without moving FiT provider?
A. Yes, you continue to submit quarterly meter readings to your FiT provider. The Elec/gas switching process should be no different than before.

Q. Once registered for FiTs, can I move to another FiT provider without changing electricity supplier?
A. Yes, subject to the FiT provider allowing applications from non-customers, which may depend on who your current electricity supplier is. There's little incentive to other than to get better service from the FiT provider. The switching process is somewhat of a mystery as few have proceeded with it, probably best to start with the FiT team at the new provider if you want to proceed with this.

Q. What questions should I ask a FiT provider before registering/moving to them?
A. See above question about differences between them, then ask them about those topics. Note many providers are putting systems in place to speed up/automate payments with varying success. There are a number of forums threads specifically discussing problems surrounding FiT payments, but note that past service is not necessarily a reflection of current or future service standards.

Q. What happens if I sell my home?
A. See the following YouGen blogs

Q. My meter goes backwards sometimes when my Solar PV is generating, will this be a problem if I want to move electricity supplier?
A. You should have already notified your FiT supplier and/or electricity supplier that the meter is going backwards. If they haven't actioned that yet, then it may make for some interesting discussions between the 3 parties trying to agree a meter reading at the date of supply transfer.

Q. Will I have problems transferring my FIT?
A. No evidence either way I'm afraid. Perhaps the only known issue you may come across is that most if not all of the 'Big Six' will only accept a FiT application if your Electricity supplier is not one of the 'Big Six' (unless you're intending to move your supply over to them as well).

Q. Can I leave my FIT arrangements with npower  and take my "normal" energy from another supplier?
A. Yes. In theory you could use [Company A] as FiT provider, [Company B] as Electricity Supplier and [Company C] as Gas Supplier.

10. Adding to an existing PV system, or adding an additional PV system at the same address.

There is no reason why you can't 'try' to have more PV installed, but there are a few important factors:-

Additional systems, or extensions will not receive any FiT support now. FiT's can only be claimed on the first/original system.

There are two ways to add more PV. Adding additional panels to your existing system, or adding a totally separate system (panels, inverter, and TGM).

Another important factor is the District Network Operator (DNO). They only allow 3.68kW export under 'self-commissioning'. Anymore than that will require prior approval by them. You will need to check your DNO’s rules (which may be on their website). Their definition of 3.68kW will probably be:- an inverter smaller than 3.68kW, or limited to 3.68kW, or whose efficiency multiplied by 4kWp is 3.68kW or less.

For most properties (which have a single phase domestic supply) an application will have to be submitted to the DNO for prior approval, to exceed the 3.68kW limit. Your installer will need to complete a G83 stage 2 application, or a G59 application. Success is unlikely, and will almost certainly depend on you (and your neighbours) having individual supplies to each property. If you share a loop with your neighbour(s) then the DNO are much more likely to decline. Also, the DNO will take into account the number of other SSEG’s (small scale embedded generators) (PV, wind, hydro etc) in your vicinity that could potentially all be exporting at the same time.

You also need to contact your FITs provider just to get confirmation on their policies regarding extensions. I'd suggest doing it by e-mail (not phone) so you have some documented evidence.

If you are adding panels to an existing system (sharing an inverter and TGM) ask your FITs provider how they calculate the division of generated units. They will most likely apportion generation entirely on the installed capacity of the panels. Crucial – if they take no account of orientation, and you are adding East panels to a South system, then when the generation is apportioned, some of the ‘old’ system units, will end up as ‘new’ system units, and not get paid, since in reality, the S system will outperform the E system per installed kWp.

Some recent Navitron threads:,19792.0.html,18456.0.html

11. Common terms and acronyms used on this site in conjunction with PV and renewables in general.

AGW = anthropogenic global warming
DECC = Department of Energy and Climate Change
DNO = District network operator
FITs = Feed in tariff scheme
Mono = Monocrystalline panels
NG = National Grid
Poly = Polycrystalline panels
PV = Photovoltaic
PVGIS = Photovoltaic Geographical Information System
RECs = Regional electricity companies (out of date term - now just 'electricity supplier')
SP = solar panel (could be electrical (PV) or thermal (water))

12. FiT Degressions

FiT rates are to be reduced/degressed over time as the technology becomes cheaper, encouraging greater take up. The government has decided that PV FiT rates should be reviewed every 3 months (1st Jan, April, July & Oct). If installs during the qtr that just ended exceed 100MWp, then a 3.5% degression will be applied to the next but one qtr. So qtr 1 affects qtr 3, 2 affects 4 and so on.

If installs within a single qtr are even higher (150+MWp, 200+MWp or 250+MWp) then degressions of 7%, 14% and even 28% can be applied.

If there have been no degressions triggered for 3 qtrs, then an automatic 3.5% degression will be applied, so we will, at the very least, see a 3.5% reduction every 9 months.

Latest: The installs in qtr2 were not high enough to trigger a degression in qtr4 (1/10/14). As this will take the non-degression period to 9 months we will see an automatic degression of 3.5% on 1/1/15 even if installs don't reach any of the degression levels [Edit 4/11/14 - installs in qtr3 just exceeded the 3.5% degression point of 100MWp with 103MWp of installs. So a 3.5% degression will take place.]. A degression of 3.5% will take the FiT rate for an upto 4kWp system to 13.88p/kWh.

Purely supposition, but installs seem to be growing, and if qtr4 installs are similar to qtr3, and exceed 100MWp, then we could see a further 3.5% degression at the start of qtr2 2015 - 1/4/15.

Latest (23/1/15) - PV installs in qtr4 2014 exceeded the 100MWp degression point, so the FiT rates for upto 4kWp (and 4-10kWp) will be degressed by a further 3.5% on 1/4/15. the new rate should be ~13.39p/kWh.

Latest (2/5/15) - PV installs in qtr1 2015 exceeded the 100MWp degression point, so the FiT rates for upto 4kWp (and 4-10kWp) will be degressed by a further 3.5% on 1/7/15. The new rate will be 12.92p/kWh.

Latest (3/7/15) - awaiting OFGEM results for qtr 2 installs. Best bet is that they will again exceed the degression point, triggering a 3.5% cut on 1/10/15 to 12.47p. Results should be announced by late July.

Latest (1/8/15) - OFGEM have confirmed a FiT rate cut to 12.47p from 1/10/15.

It looks like the falling price of PV and 'constant' upcoming FiT reductions have created a level of demand consistently above the degression point.

13. Basic consumer advice and protection.

For an introduction into consumer protection and rights, you can find information both general and PV specific on the RECC website:

There are also sections of the RECC code that potential PV'ers and concerned recent PV'ers may be interested in, such as section 5 'pre-sales activities'.

The RECC website also has a Top Tips section, worth listing (but links removed):

- Make sure you get at least three quotes before deciding to contract with a company.

- Only approach companies listed on the RECC website.

- Only approach companies certified by the Microgeneration Certification Scheme (MCS) for the relevant technology.

- Read our guidance carefully before you sign a contract or pay a deposit.

- Before you sign a contract or pay a deposit make sure you read and understand all the information carefully; ask for clarification if you don’t.

- Never pay more than 25% of the contract price up front; check it will be protected.

- Never sign a contract if you are being offered a discount or pressurised in any way at all to sign it; this is illegal.

- Remember if you sign an order form or contract with a sales rep in your home you have the right to cancel the contract within 14 days from the date the goods are delivered to you.

- If you want the installation to start during the 14-day ‘cancellation’ period you must give your express written consent; if you later cancel the contract you will have to pay for any work completed.

- Even if you do not sign an order form or contract with a sales rep in your home you still have the right to cancel the contract within 14 days from when you signed the contract; make sure you don’t give up this right by signing a waiver.

- If you are being offered finance by the company you’re contracting with remember you have 14 days from the date you receive the documentation from the finance provider to cancel the agreement without penalty.

- Check the Energy Saving Trust website for objective information and target prices.

- Check the DECC calculator for objective information about payments available under the Domestic Renewable Heat Incentive.

- Make sure any testimonials you rely on are genuine; contact the people yourself to check that they are, and that they were not paid for.

- Before you sign a contract or pay a deposit make sure the company gives you in writing a quote including a standard performance estimate specific to your property and a full, all-inclusive breakdown of what will be supplied.

- Before you sign a contract or pay a deposit make sure the company gives you in writing the standard terms and conditions that will form the contract

- Remember if you or the company make any changes to the contract make sure they are agreed in writing and part of the contract; if you are not happy with any changes you have the right to cancel the contract within 14 days with no penalty.

- Remember to send us your feedback once the job has been completed.
« Last Edit: May 19, 2018, 06:48:58 PM by M » Logged

Just call me Mart.     Cardiff: 5.58kWp PV - (3.58kWp SE3500 + 2kWp SE2200 WNW)
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