⚡ Optimisers help to maximise a solar panel’s output

🌳 Solar panels already have technology to help them deal with partial shade

📈 Optimisers increase the cost and complexity of your system

💷 Microinverters are generally better than optimisers, but cost more

🛠️ Either of these products can fix multiple issues that reduce your output

When you’re getting a solar panel system, you want it to produce as much electricity as possible, so you can maximise your electricity bill savings.

But if your system is partly shaded, you may need to turn to solar panel optimisers, which manage each panel individually and improve their performance.

In this guide, we’ll explain how optimisers work, their pros and cons, and which households should seriously consider getting them.

If you’re wondering how much you could save with a solar & battery system, enter a few details below and we’ll generate a quick estimate.

What is a solar panel optimiser?

A solar panel optimiser is a small box that connects to a solar panel and tracks its generation, then alters the panel’s electrical characteristics to make sure your system produces as much electricity as possible.

It achieves this via Maximum Power Point Tracking (MPPT), the same technology used by string inverters to maximise a system’s generation.

If your installer recommends that your system needs optimisers, this will mean getting one fitted to every solar panel that could suffer reduced output – for example by being in shade – to ensure they don’t affect how much electricity the rest of your system generates. 

Or, depending on the brand of optimiser you go for, you may need to get one for every panel – even the ones that aren’t expected to experience any output loss.

You should be able to monitor your system’s performance via your solar panel app, and see whether your optimisers are working properly – or whether you need to add some.

Solar panel optimisers work by rerouting the electric current flowing through your solar panel system around panels that are underperforming.

If a small amount of shade falls on one of your panels and temporarily reduces its output by 10%, it can cut your entire system’s generation by 10% – unless you have an optimiser on that panel.

This is because solar panel systems are usually wired in series, meaning every panel’s positive terminal is wired to another’s negative terminal. This raises the system’s output, but means that a drop in one panel’s production levels is replicated across every panel.

When a solar panel’s output falls because of shading, its optimiser can take it out of series and put it in parallel, meaning the shaded panel can still continue to produce its lesser contribution, and the other panels won’t be brought down to its level.

This is an invaluable service, but it’s only necessary in certain situations, as your solar panels already have an in-built solution to partial shading: bypass diodes.

Manufacturers will usually include three bypass diodes per panel, and they’ll each monitor one third of the cells in that panel. If shading affects one of these areas, the relevant bypass diode will reroute the current around that section.

This means you’ll miss out on that section’s solar-generated electricity until it’s unshaded again, but it’s a small price to pay for keeping the system’s current level as high as possible.

Bypass diodes also protect your solar cells from damage, since a panel in the shade can actually overheat and break.

Ideally you’d want a bypass diode for every cell, as this would maximise your system’s output, but the cost would be prohibitive. Three per panel is the practical, cost-effective compromise made by most solar panel manufacturers.

However, bypass diodes generally only step in when 20% of their section is under shade.

So if 15% of your panel is under shade, but it’s spread across three bypass diode areas, it will lower the entire system’s output by 15% – and your bypass diodes will do nothing.

This is where optimisers come in. They’ll leap into action whenever they sense even a modicum of shading, so your system can always work to its maximum level.

<center><em>Optimisers can help you maximise your system's output</em></center>

How are solar panel optimisers installed?

Solar panel optimisers are usually installed on the back of your solar panels or on the mounting brackets they sit on.

Each optimiser will be secured in place within easy reach of a panel, as they must be close enough for an installer to connect the two without using extension cables.

After the installer has connected every optimiser’s cables to its panel and the inverter, they’ll check that the voltage is correct and everything is functioning as it should.

It’s a relatively simple process that usually forms part of a solar panel system installation, though they can also be retrofitted later on.

The exact installation process will also depend on which brand of optimisers you buy – for instance, Tigo’s optimisers have extra wiring and communication needs.

SolarEdge, however, requires you to get a specific SolarEdge inverter, and to have optimisers fitted to every panel, rather than just the ones that experience shading.

To find out how much you could save with a solar & battery system, enter a few details below and we'll generate an estimate for you. 

The pros and cons of solar panel optimisers

Optimisers can increase the amount of electricity your system produces while also raising its price, so it’s important to perform a cost-benefit analysis before you commit.

It also helps to ask one of the best solar installers around – like us – to inspect your rooftop and estimate whether any of your panels will require optimisers.

It’s also worth considering other technologies that let you track and maximise your panels’ output, like microinverters – which a good installer will do too.

You can prevent a partly shaded solar panel from affecting your system’s overall output. A system that suffers from diffuse or partial shading could produce much more electricity with strategically placed optimisers.

They can add to your savings and earnings. If your panels produce more electricity, you’ll need to import less from the grid, and you can sell more to the grid through an export tariff.

You can monitor the performance of every panel that has an optimiser. If all your panels are connected to an optimiser, you can easily diagnose the issue if your system’s overall output ever drops dramatically.

Homes with solar panels on multiple roofs can use optimisers to maximise output. Solar panel systems that are spread across three roofs will struggle to produce as much electricity as possible with a string inverter. Optimisers can solve this issue – though microinverters can too.

Optimisers maximise output even as your solar panels degrade or get dirty. Solar panels lose a tiny amount of output every year, but even in the same system, they’ll usually degrade at different rates. The same is true of dirt – it accumulates on panels to different levels. Optimisers use MPPT to combat this, so each panel will function at its highest possible level.

It adds to your upfront cost. Every extra optimiser bumps up your overall price, with some costing roughly the same as the panel it’s attached to.

Optimisers’ panel monitoring isn’t as sophisticated as it could be. Microinverters monitor your panels’ output in a more dynamic, detailed, and up-to-date manner.

They increase the complexity of your system. Solar panels require a limited amount of maintenance, but installing optimisers means more electrical gear on your roof, and so increases the chance of something going wrong.

Does your solar PV system need optimisers?

Your solar panel system may need optimisers if it often falls under diffuse or partial shading, whether from a tree, chimney, or weather vane.

Without optimisers, any shade could drastically impact your system’s output, as other panels will only be able to produce the same amount of electricity as the affected panel.

In this case, optimisers will allow you to separate the shaded panel from the rest of the panels, and allow the unaffected ones to go on generating as much electricity as they can.

However, solar panels are already fitted with bypass diodes – typically three – which each perform the same function once shading on their section of the panel reaches 20%.

If you have solar panels that face more than two compass directions – for instance, if they face south, west, and east – then a regular inverter won’t be able to handle it well, and your output will suffer as a result. Optimisers can solve this issue.

However, in all these scenarios, a solar panel system in need of optimisation is better off with microinverters – even if they are more expensive. We’ll go into more detail about microinverters later in the article.

You don’t need an optimiser on every solar panel, strictly speaking – but it does allow you to monitor your entire setup and maximise your output.

If you know some of your panels will be affected by diffuse or limited shading, you can only add optimisers to those, but this will leave you unable to address any issues with the others.

And over the years, as they degrade and accumulate dirt, it’ll be increasingly helpful – and profitable – to be able to monitor and automatically adjust all your panels.

Some brands, like SolarEdge and Huawei, only offer solar packages that come with an optimiser for every panel.

However, other companies including Tigo allow you to only attach optimisers to panels affected by shading.

Tigo does recommend that customers buy an optimiser for every panel, but leaves the final decision up to you – making it a potentially more cost-effective option.

<center><em>A solar panel system in need of optimisation is usually better off with microinverters</em></center>

How long do solar panel optimisers last?

Solar panel optimisers generally last around 20-25 years.

That’s why brands like Tigo and SolarEdge’s optimisers come with 25-year warranties, which is also relatively standard for solar panels.

This theoretically means your optimisers should need replacing around the same time as your panels, though in reality, panels can function perfectly well for up to 40 years.

As long as your panels are still working properly, it’s usually worth replacing optimisers that have reached the end of their lifespan.

Doing so is potentially more important as your panels degrade, since larger gaps can open up between individual panels’ performances. With optimisers, you can monitor your panels and get the most out of them throughout their decline.

Do solar panel optimisers require any maintenance?

Solar panels optimisers don’t typically require any maintenance, though like any electrical product, they can experience issues.

Adding any extra items to your system will increase its complexity and the chances of something needing maintenance, and this holds true for optimisers.

If you do get optimisers, check that your warranty includes repairs and replacements if any of them break down.

Fortunately, if you’re regularly monitoring your panels, any optimiser faults should be easy to spot, as you’ll have a decent idea of what outputs to expect from them.

Solar panel optimisers vs microinverters

Microinverters convert each solar panel’s DC electricity to AC, meaning they can replace your string inverter and negate any need for optimisers.

They give you all the monitoring benefits and automatic adjustments that optimisers provide, while offering a number of additional advantages.

Microinverters enable you to add more panels to your system at a later date, even if they’re a different model, size, or brand. All you’ll need is more microinverters.

If you have optimisers however, you may need to get a new string inverter to suit the system’s upgraded capacity, which can be a more difficult, costly process.

Microinverters also fare better than optimisers in low light, since they can start producing electricity with just 20-30 volts. String inverters require at least 60 volts, and usually closer to 200 volts – even with optimisers.

In terms of safety, microinverters are also the better choice, since they perform electricity conversions at each panel. This means there’ll be no high-voltage DC running from your system to your inverter – unlike a setup with a string inverter and optimisers. 

Microinverters are generally better than optimisers, but are usually around three times more expensive.

However, you’ll save by not needing to buy a string inverter, and you may generate more electricity than you would with optimisers – meaning it could be worth it in the long run.

Are solar panel optimisers worth it?

Solar panel optimisers are only worth it if they save you more money than you spend on them – so this calculation should form a crucial part of your decision-making process.

All optimisers have operating power losses, meaning that to stay on, they use about 2% of the electricity that your solar panels generate.

Your installer should work out how much extra electricity optimisers will squeeze out of your panels over their lifespan, enabling you to make a proper comparison.

If your system would only experience shading for part of each day and only on a small number of panels, it may not be worth the cost.

Optimisers will also add to the complexity of your system, and increase the number of electrical items that can break and require maintenance. This can be expensive for rooftop systems, especially as your optimiser warranty probably won’t include scaffolding costs.

Solar panels already come with bypass diodes that do a pretty good job of managing your system’s output under partial shade, so they don’t generally require optimisers.

If we think your system could benefit from optimisation, we’ll recommend it, though we usually prefer to install microinverters, as they’re superior to optimisers in all the ways we’ve explained above.

Solar panel optimisers: FAQs

Do you need optimisers on all solar panels?

What does an optimiser do on a solar panel?

Where are solar optimisers fitted?

What is the warranty of optimisers vs microinverters?

Solar panel optimisers: are they worth it? [UK, 2024]

What's in this guide?

Solar panel optimisers: the expert guide

✂️ A solar & battery system can cut your annual electricity costs by 103%, on average

📈 Solar panels can increase a home’s value by 3%

💷 The upfront cost is £9,000 for the average three-bedroom household

🏡 Most houses are suitable for solar panels

📅 They work all year round

It’s important to weigh up the benefits and drawbacks of getting solar panels, as you would before any home improvement.

As well as the financial elements, it’s also worth considering their environmental impact, how much they’ll add to your property’s value, and what the planning process will be like.

In this guide, we’ll run through all of these pros and cons and more – and explain how you can make the most of your system while avoiding the biggest pitfalls.

If you would like to see the savings you could get from a solar & battery system, answer a few quick questions below, and we’ll provide an estimate.

What are the advantages and disadvantages of solar panels?

Solar panels, like any source of energy, come with upsides and downsides.

Fortunately, there are many more upsides – as you’ll see below – and most households can easily avoid the downsides.

The upsides are also excellent – among the many positives, you can save hundreds of pounds per year, cut your carbon footprint, and increase your home’s value.

There are numerous advantages to going solar, because it’s a source of free, green electricity that often lasts upwards of 30 years.

Here are all the best benefits to getting solar panels.

Solar panels generate electricity that you can use in your home, which reduces the amount of electricity you have to buy from the grid.

This cuts your electricity bills, and if you get a solar battery too, you can save even more – 103%, on average, which means across a year you actually earn more than you spend. 

This might sound too good to be true, but it’s all because of the high performance of modern solar panels and storage batteries, as well as export income. The panels will dramatically reduce the amount of electricity you buy from the grid, and you’ll also earn money by selling your unused electricity to the grid.

This 103% figure is based on a household experiencing average UK irradiance with a 4.4 kilowatt-peak (kWp) solar panel system and a 5.2 kilowatt-hour (kWh) battery, using 3,500kWh of electricity each year and signed up to the Intelligent Octopus Flux export tariff.

The electricity your system generates and stores can also power heat pumps and electric vehicles, which means you can use your panels to slash your heating and driving costs too.

Solar panels cost thousands of pounds if you pay upfront, so it’s only right that they substantially lower your energy bills.

2. You can sell excess energy to the grid

<div style="text-align: center; font-size: 14px;">
<div style="display: inline-block; border-radius: 8px; overflow-x: scroll; max-width: 100%; margin: 40px auto; text-align: left;">
<table style="background: rgba(0,0,0,0.02);">
  <tr style="background: #4EE5D3; text-align: left; border-radius: 4px;">
    <th style="padding: 12px;">Provider</th>
    <th style="padding: 12px;">Name of tariff</th>
    <th style="padding: 12px;">Rate (p/kWh)</th>
    <th style="padding: 12px;">Customers only?</th>
    <th style="padding: 12px;">Avg annual income**</th>
  </tr>
  <tr style="border-bottom: 1px rgba(0,0,0,0.1) solid;">
    <td style="padding: 12px;">Octopus</td>
    <td style="padding: 12px;">Intelligent Octopus Flux</td>
    <td style="padding: 12px;">29.4*</td>
    <td style="padding: 12px;">Yes</td>
    <td style="padding: 12px;">£350</td>
  </tr>
<tr style="border-bottom: 1px rgba(0,0,0,0.1) solid;">
    <td style="padding: 12px;">Octopus</td>
    <td style="padding: 12px;">Octopus Flux</td>
    <td style="padding: 12px;">26*</td>
    <td style="padding: 12px;">Yes</td>
    <td style="padding: 12px;">£317</td>
  </tr>
  <tr style="border-bottom: 1px rgba(0,0,0,0.1) solid;">
    <td style="padding: 12px;">E.ON</td>
    <td style="padding: 12px;">Next Export Premium v2</td>
    <td style="padding: 12px;">21</td>
    <td style="padding: 12px;">Yes</td>
    <td style="padding: 12px;">£266</td>
  </tr>
  <tr style="border-bottom: 1px rgba(0,0,0,0.1) solid;">
    <td style="padding: 12px;">OVO</td>
    <td style="padding: 12px;">OVO SEG Tariff (exclusive)</td>
    <td style="padding: 12px;">20</td>
    <td style="padding: 12px;">Yes</td>
    <td style="padding: 12px;">£254</td>
  </tr>
<tr style="border-bottom: 1px rgba(0,0,0,0.1) solid;">
    <td style="padding: 12px;">EDF</td>
    <td style="padding: 12px;">Empower Exclusive</td>
    <td style="padding: 12px;">20</td>
    <td style="padding: 12px;">Yes</td>
    <td style="padding: 12px;">£254</td>
  </tr>
</table>
</div>
</div>
<p><em>* Time of use tariffs pay different amounts depending on the time of day and their location in the UK. For those tariffs, we’ve given the average peak rate.</em></p>
<br>
<p><em>** These figures are based on a home with a 4.4kWp system, a 5.2kWh battery, an annual consumption of 3,500kWh, and typical UK solar irradiance, which exports 34% of its solar electricity. Intelligent Octopus Flux and Octopus Flux also generate additional income by using electricity arbitrage – that is, charging from the grid at cheaper times, then exporting back to the grid at more profitable times. We’ve used lower rates to estimate the income from these tariffs, to be conservative.</em></p>

You can earn hundreds of pounds per year by sending the excess electricity your solar panels produce to the grid.

There will be times, especially during summer, when your panels generate more electricity than your home can use and your battery can hold.

This electricity will automatically be sent to the grid – but if you sign up to a solar export tariff, you can gain some profit instead of giving it away for free. The average household can save around £350 per year via Intelligent Octopus Flux, one of the best export tariffs.

This £350 figure is based on a household experiencing average UK irradiance with a 4.4 kilowatt-peak (kWp) solar panel system and a 5.2 kilowatt-hour (kWh) battery.

All the major electricity suppliers offer export tariffs – often called Smart Export Guarantee rates – but they vary enormously, from 1p per kilowatt-hour (kWh) to above 20p per kWh.

Fortunately, your export tariff can be with any company, so it doesn’t have to come from your electricity supplier.

If you signed up to the Feed-in Tariff before it closed to new applications in 2019, you’ll still receive export payments from that scheme, unless you switch to an export tariff.

Solar panels are a clean and renewable source of energy, meaning they don't produce any harmful emissions.

By using solar panels, you can therefore reduce your carbon footprint and help the planet.

With a solar & battery system, your household’s carbon footprint will drop by around 1.1 tonnes of CO2 per year, on average - or 31%. This is based on a database of 32 different solar & battery systems designed by Sunsave, located across England and Wales. Each system in the database uses 430W solar panels and a 5.8kWh battery. 

This will cut your annual household carbon footprint by 31%, as the average UK household's carbon footprint is 3.5 tonnes per year. This figure is based on a government report that households account for 26% of the UK’s carbon footprint, the country’s latest emissions total of 384.2 million tonnes, and the fact that there are 28.2 million households across the nation at the last count.

This drop is so dramatic because 49% of electricity from the grid is powered by fossil fuels, which contribute heavily to your home’s carbon footprint. By using less of it, you’re responsible for a lower rate of emissions.

4. You could benefit from government incentives

There are various solar panel grants available for certain households that want to go solar but can’t afford the upfront cost. These include:

The Home Upgrade Grant. There are currently hundreds of local authorities in England where households can access tens of thousands of pounds in funding if they’re low-income, not connected to the gas grid, and have an Energy Performance Certificate (EPC) between D and G

The Energy Company Obligation 4 (ECO4). Until 31 March 2026, this scheme will offer solar panels to electrically heated, low-income households with a vulnerable resident who receives a qualifying benefit

0% VAT on residential solar panel installations. This discount applies to all domestic solar panel system installations in the UK up to April 2027 – including standalone solar battery installations

Check out our free eligibility checker to find out if you're eligible for a solar panel grant. 

Due to their stringent requirements, most households won’t be able to access these government incentives. If that includes you, Sunsave Plus may be the answer.

For a fixed monthly fee, our subscription service will provide an all-in-one solar and battery solution that’s tailored to your home, at no upfront cost.

It also comes 24/7 monitoring and maintenance, free replacement parts (including a battery and inverter), downtime cover, and insurance against damage, fire and theft. 

Answer a few quick questions below to sign up for Sunsave Plus, and we'll be in touch.

Sign up for Sunsave Plus

Solar panels generate electricity on every day of the year, in all conditions.

Their output peaks in summer – when you’ll be able to earn lots of money by exporting electricity to the grid – and is lowest in winter.

But even during these darkest months, they’ll still cut your electricity bills.

If you add a solar battery, you can get the most out of the electricity your system produces throughout the year, either by using it in your home or selling it to the grid.

If you're wondering whether a battery would be right for your home, check out our guide to whether solar batteries are worth it.

The chart below shows how a 6kWp solar panel system’s output levels vary across a typical year, as well as the fluctuating consumption patterns of a household that uses 4,000kWh of electricity each year.

Your upfront cost may be steep, but if you get a well-sized system for your home, you should make your money back over time.

You’ll recoup your outlay by importing less electricity and selling your excess electricity to the grid, allowing you to break even on your initial investment in 7.9 years, on average.

This figure comes from an average of 32 different solar & battery system designs from our database, comprising properties from all over England and Wales. Each system is designed with 430W solar panels and a 5.8kWh battery, and is signed up to Octopus Flux.

This means that for the great majority of households, solar panels are worth it.

Solar panels can increase the value of your home by 3%, according to a study by Rightmove in 2023.

They achieve this level of growth by raising your property’s Energy Performance Certificate (EPC) rating – an energy efficiency grade between A and G that can be seen by all potential buyers.

Solar panels raise a home’s EPC rating by 18 points on average – a whole grade – according to our calculations, which are based on the government’s Standard Assessment Procedure (SAP) guidance.

This will allow you to make as much as £10,000 more from selling your property, according to the Sustainable Homes and Buildings Coalition.

8. You’re insured against rising energy costs

The cost of electricity is high now, and it may well rise further in the coming years.

It’s difficult to forecast the future, but past data from the Office for National Statistics (ONS) shows that between 2000 and 2020, electricity prices rose by 5.5% per year on average.

This steady increase was brought about by underlying inflation more than by changing wholesale values, which indicates that even if wholesale prices plateau or fall at some point, the cost of your energy will probably still grow at a similar rate over the next two decades.

Solar panels can cushion this blow by lowering your costs and providing you with excess electricity to sell to the grid.

Modern solar panels are manufactured with a hydrophobic coating, which means rainwater rolls right off them.

In the UK, this happens fairly often, which stops dust and dirt from building up on the surface of your system and reducing its output.

Of course, if you take the rainy weather away, solar panels aren’t self-cleaning, but this is only a problem in dusty, arid places – not the UK.

To learn more, check out our guide to solar panel maintenance.

As electric vehicles and heat pumps become the norm, household electricity usage is set to spiral upwards.

The government is aiming for fully electric vehicles to make up 80% of new car sales by 2030, as their popularity continues to grow unabated.

Heat pump sales aren’t increasing quite as rapidly, but the Boiler Upgrade Scheme has ensured they remain on the rise, as the government attempts to meet its target of 600,000 sold per year by 2028.

As the UK gradually electrifies its heating and transport infrastructure, the country’s electricity consumption will grow by 50% between 2020 and 2035, according to consultancy firm McKinsey.

Fortunately, a solar & battery system can power both of these major additions to your life, massively reducing their running costs.

That way, you can use a large amount of electricity every year without paying through the nose.

11. You’re protected against power cuts

With a battery, solar panels can supply you with electricity during a power cut, protecting you against hours or even days of chaos and inconvenience.

As well as a battery, which most modern solar installations include, your installer will also need to give your system Emergency Power Supply (EPS) functionality, by setting up a relay that can physically disconnect your home from the grid when a power cut happens.

You can choose any level of EPS, from just power sockets to your whole home.

After they’re done, you’ll just have to set your battery’s minimum level, so you always have a certain amount of electricity available if the grid goes down.

This is less of an issue if a power cut happens during the day, since your solar panels can keep topping up your battery while it supplies electricity to your home.

Modern solar panels typically come with a performance warranty that guarantees a high level of output at 25 or even 30 years.

This means they can potentially keep generating substantial amounts of free electricity for decades after you break even – and in most cases, it’s a conservative estimate.

Monocrystalline panels, which are the sleek, black models that have become the most popular type of solar panel in the UK, are estimated to last at least 40 years when maintained properly.

For more information, check out our guide: how long do solar panels last?

After 30 or 40 years – or longer – your solar panels will stop functioning completely. At this point, you can easily recycle them, for free.

Your installer is legally compelled to arrange for your solar panels to be collected and recycled under EU regulations, which still apply despite Brexit.

If your installer has gone out of business in the decades since they worked on your home, just get in touch with a service like PV Cycle, which will take your panels away and recycle them – again, for free.

Recycle Solar in Scunthorpe is currently the only recycling centre in the UK that’s run on an industrial scale, but more will inevitably be built in the coming decades as the market grows.

There are a few drawbacks to getting solar panels.

We’ll run through them below, along with the best ways to make sure they don’t impact your experience or stop you from getting solar panels in the first place.

The cost of solar panels is high if you pay upfront, with the average currently standing at £9,000 for a typical three-bedroom household.

This includes the cost of the panels, inverter, and installation, with a battery usually adding £2,000, for an overall price of £11,000.

However, it doesn’t have to be this way. We’re offering the UK’s first solar subscription, so you can have panels installed at no upfront cost, and start saving on your electricity bills from day one.

Without a service like Sunsave Plus, solar panels are still out of reach for most people, with half of UK households holding less than £5,000 in savings.

Most properties are suitable for solar panels, but some won’t benefit enough to make it worth it.

If your only usable roof is north-facing, it’ll be trickier to build a profitable system, especially if you also live in one of the northernmost areas of the UK.

You can get a ground-mounted system or an installation on a flat roof, but you’ll face higher costs and have to jump through planning permission hoops that most properties will avoid.

Installing solar panels on a flat, a listed building, or in a conservation area also comes with a more complicated planning permission process – but it’s far from unachievable.

If your home has vaulted or profiled ceilings, they may not be suitable, as your installer will need loft space that allows them to safely access the underside of the roof.

And if your roof is subject to unavoidable shading all day, every day, a solar panel system wouldn’t work for your property.

Here are all the pros and cons of solar panels, plus how to make the most of your system while avoiding the biggest pitfalls.

Josh Jackman

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