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'Add-on' equipment for solar PV: an opportunity but beware of possible pitfalls

Posted by Lorraine Haskell (RECC) on 30 January 2018 at 10:44 am

Here at YouGen we’re producing a blog series which look at some examples of ‘mis-selling’, used by a small number of rogue traders in the renewables and energy efficiency industry. Although mis-selling is a trend which appears to be on the increase, there are also rising numbers of reputable organisations which are attempting to eradicate this form of bad practice by making sure customers stay informed. Here is a blog written from the perspective of Lorraine Haskell from RECC which covers what you need to know on the subject. 

The Renewable Energy Consumer Code (RECC) is approved by the Chartered Trading Standards Institute, and sets out the high standards of consumer protection in marketing, selling and the after-sales service, which should be expected by domestic consumers who have chosen to install renewable energy and other equipment related to that energy generator.

The attractiveness of renewables is growing, as equipment costs fall and governments - including our own - are setting out plans and providing incentives for investment in a ‘low carbon industrial future’.

On the back of any successful industry, however, there comes the potential for mis-selling; companies on the lookout for a ‘fast buck’ can take advantage of unwary householders or small businesses, offering incomplete, inaccurate or - in the worst cases - downright false information.

RECC is aware that a growing number of home-owners who already own, or are considering installing, solar PV systems or related products, have been coming under increasing pressure from companies cold calling and offering 'upgrades' and ‘add-on’ services for their systems.

When approached by a company offering ‘add-on’ goods or services you should first ask them how they got your phone number. If you’re not happy with their response, you shouldn’t pursue the call. If your number is listed on the Telephone Preference Service (TPS) you should not receive any cold calls at all. If you do you can consider reporting the matter to the Information Commissioner’s Office.

Offers come in several forms and may be perfectly legitimate and worthwhile. However, in some instances, these products are being mis-sold. Offers include (but are not necessarily limited to) the sale of domestic-scale battery storage systems; voltage optimisers; diversion devices; energy saving equipment such as LEDs (light-emitting diodes), extended warranties and insurance. Some companies are also offering consumers replacement inverters, telling them that their original inverter is not performing well or is not efficient.

Making the right choices is not always straightforward and you should consult the information available from impartial sources (such as RECC, YouGen, or the Energy Saving Trust) to see if you are likely to benefit.

Certainly, you should not agree to any offer of goods or services without considering carefully whether you need the product or service being offered. These types of products and offers can sometimes benefit consumers, but they do not always live up to the claims made for them.

Battery storage systems are becoming increasingly popular but householders considering them should weigh up the pros and cons carefully. Equipment costs are falling, but achieving a financial payback for most domestic users is currently unusual and depends on particular circumstances. RECC has produced a guide, in association with technical experts BRE which includes twenty questions people interested in domestic energy storage should ask their potential installer (Link). 

Voltage optimisers are another popular ‘add-on’ being offered. They can be called many names like a ‘magic box’, for example. They reduce the voltage of the electricity entering your home and as a result, it is claimed, save you money on your electricity bills. RECC has found, however, that there is no robust evidence to support claims of 10-15 per cent ‘typical’ savings. Conversely, one study that BRE judged to be ‘robust’, found that the voltage optimisers tested led to an average reduction in electricity demand of close to 5 per cent.  The study also found a wide variation in impact with electricity demand actually increasing in one home, while in another the reduction was 19 per cent (Link).


Choosing a company that is a member of RECC (and who will normally display the logo on their website) means they have been through a robust accreditation process. This provides you with protection, and means that any marketing claims they make should be accurate and honest.

·         Code Members must make sure that any verbal statements and advertising and sales promotion materials do not mislead Consumers in any way and that they do not lead Consumers into taking decisions they otherwise would not have done. 

·         Code Members, their Employees and those who sell on their behalf must not give false or misleading information about their business or the product, services or facilities being offered. They must not make any statement that is likely to mislead a Consumer in any way.

·         Code Members whose representatives contact Consumers by telephone must ensure that their representatives comply with best practice at all times, as set out in Telephone Preference Service Assured’s guidance on outbound telemarketing best practice.

·         Code Members, their Employees and those who sell on their behalf must ensure that any estimate of savings, periods of recovery ('payback') or other measures of financial effectiveness they provide to Consumers are provided in writing and are based on Consumers’ actual energy use and pattern of energy use. Any assumptions that have been made (for example, about future energy prices, interest rates or inflation) must be set out, clearly explained and attributed to a reputable source.


RECC can also help consumers of accredited companies, who may have a dispute with their installer but cannot resolve this with them directly, where disputes fall under the remits of the Code.

RECC guidance on supplementary solar PV equipment:

BRE/RECC: Batteries and Solar Power: Guidance for domestic and small commercial consumers:

RECC guidance on faulty or underperforming system issues:

More information:, or contact RECC on 0207 981 0850.


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About the author: Lorraine Haskell is Head of Independent Panels and has worked for RECC (Renewable Energy Consumer Code) for over five years. She manages the Applications Panel, and represents RECC at hearings of the independent Non-Compliance Panel and Appeals Panel. She has extensive experience of presenting cases of non-compliance in accordance with RECC’s disciplinary procedure, and sits on various industry working groups.

If you have a question about anything in the above blog, please ask it in the comments section below.

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5 comments - read them below or add one

Sam Tonge

Sam Tonge from Comment left on: 5 April 2018 at 11:01 am

Hi Nick Hanna - thank you for your feedback.

Please could you let me know which links aren't working and we can have a look for you?

All of the links on this page seem to work okay for me. All the best, Sam

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Nick Hanna

Nick HannaComment left on: 5 April 2018 at 10:52 am

I left a 'not very useful' on the poll because the links do not work in this piece.

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richmcComment left on: 31 January 2018 at 2:40 pm

Hi Allen.

By Europiean directive UK mains voltage should be 230VAC, it was thought by the grid providers to be too expensive to convert the UK from 240 to 230 so they didn't. Now worldwide suppliers understandably supply domestic equipment to the EU including the UK set to operate at 230VAC so stuff of a resistive nature will suffer from over voltage, other equipment TV's computers etc will have their lifespan affected by being over stressed.

If you find the mains voltage exceding 253VAC then it is outside legal limits and the distributor is obliged to rectify that. In my case they tapped down my local transformer, it appered to me that the problem occured during high winds, I summised that one or more local wind turbines were the culprit, lately there has been some "maintainance" at a local wind farm and as if by magic there are no more peaks, I'm sitting very happyly at around 230VAC, the kettle may take a little longer to boil but at least my PC won't be destroyed.

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allenspComment left on: 31 January 2018 at 1:24 pm

Completely agree with previous comments by Richmc. I fitted a "diverter" myself about 18 months ago which cost £230 from eBay. Very pleased with the results!

I would like to query the subject of mains voltage though. What should it be? My solar PV ALWAYS registers in excess of 240v. I have checked with Fluke MM and found just below 240v. I was expecting approx 230v as widely advertised a few years ago!

What should it be?

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richmcComment left on: 31 January 2018 at 12:54 pm

1) The first add onto consider will always be a diverter to heat a tank full of water.

2) Weigh up the benifits of a battery system, I have a Wattstor system and with the latest software upgrades I an very happy with it, little use in the winter but it has a winter maintainance mode.

3) Voltage optimisers useful when your mains voltage is too high, but a better alternative is to contact your local grid supply service Western Power in my case and have the voltage monitored, if over spec (as in my case) they will "down tap" your local transformer to get it in spec........cost nothing but a couple of phone calls.

4) everyone reading this blog should be 100% LED lit except maybe for that light in the loft used once in a blue moon, even then replace it for a LED in case you forget to switch it off.

5) Micro inverters (or solar optimisers), unless you have shading problems they have no place in your system, I have a completly un shaded roof but one company attempted to sell me a system with micro inverters, I showed them the door.

6) A decent installation company like the one I used will come out and test the eficency of your system, most panels have a 5 to 10 year spec and warrenty for output, if they are not working correctly the maker foots the bill not the installer and has the result of making the installer look good.

7) All solar systems are pretty useless in the winter, I'm considering getting a wind turbine for my winter gale swept location, if I can find a supplier, they are as rare as hens teeth! 

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