Solar panels on a Dutch house, what a difficult subject. When we bought our new house, we knew that the next step to make our house more sustainable would be placing solar panels on the roof. At that moment we hesitated. Why? One of the neighbours had a lot of trouble with leakage after the solar panels were placed on their house. This was exactly the same situation as our house.
How do you prevent this? How long does it take to earn the investment back? What kind of implications has it? What are the risks? How do you know if a company which places solar panels is trustworthy? Is it worth investing in solar panels on our Dutch house?
So, a lot of questions. This blog is not complete, but hopefully, it will guide you in your process.
The first step is checking how much electricity we use in a year. In our case, it is around 2600 kWh for a house holding with 2 adults and 2 kids. That is not so much.
You can check your use of electricity at the yearly reckoning from the electricity company. It’s in our lifestyle to be economical in the use of electricity. When we need to replace a device, we will buy the most energy-saving option.
Some more details about our situation are: we have a flat, well-insulated roof where solar panels can be laid on. Also, there is already an extra wall outlet provided, including an extra group in our meter cupboard.
Tip: If your roof is not insulated, first sort this out before you are installing solar panels on your roof.
What are our wishes regarding solar panels on our Dutch house?
Of course, the quality must be good, and it needs to generate enough energy for our consumption. Likely, it will increase a bit when the children are getting older. The installation has to be done by professionals.
Also, we want to know who will be responsible in the case of leakage. The colour of the panels doesn’t make a difference, since they need to be installed on a flat roof. So nobody looks at them.
For this blog, we used the following resources:
– The governmental organization that is giving an overview of information about making your house and live sustainable is called Milieucentraal. They claim that only scientifically proven information is on their website and that they are independent of commercial parties.
– Consumentenbond – an independent consumer organization that tests a lot of consumer goods.
– Vereniging Eigen Huis – a non-profit organization for house owners.
Always choose products with a long guarantee period. Because solar panels have an average lifespan of 25 – 30 years. Something you can also investigate is how long a company already produces solar panels.
For the installation: Zonnekeur is an organization that stands for the quality of the installer of solar panels. Maybe worth looking at.
Zongarant is an organization who guarantees the yield of the solar panels for the next ten years.
How do solar panels work?
For now, it is too much to go deep in this subject, so you find a brief summary here. In sunlight, there is energy. A solar panel catches the sunlight and transforms this into usable energy. This energy will be transported through electricity cables. There, an inverter will take care of the needed voltage for the power grid of the house. So you can use the energy for your computer.
Things to know about solar panels in the Netherlands
The most energy will be generated in the summer months. Even in the winter, solar panels will generate energy, but less. When the sun is not shining, the light still generates energy. Not every roof is on the right edge for solar panels.
Did you know that May is normally the sunniest month of the year in the Netherlands? With an average of 212 hours of sunshine.
When your roof is not suitable for solar panels, you can join other initiatives. Like solar park Welschap in Eindhoven.
In general, it takes 7 years for the solar panels to be recouped. Maintenance is not included in this calculation.
Update September 2022: At this moment, the prices for electricity are very high. With the current rates, we earn the investment back within 3 or 4 years.
Delivering energy back to the grid
In the Netherlands, there is a “salderingsregeling”. This regulation says that when you generate more energy than you use at the moment, you can deliver that back to the power grid. In the end, you will be compensated for that by the electricity company which you use. Especially, when you deliver less back than you use, this is worth the effort.
It’s worth researching which electricity company will compensate you the most, if you deliver more energy back than you use. In 2025 this regulation will be phased out until it is totally phased out in 2031.
Maybe you can even get a subsidy from the municipality for installing solar panels on your roof. That is not the case in Eindhoven.
And last but not least: You can ask the 21% VAT back on the purchase of the solar panels if placed on your Dutch house. In 2023, it is getting easier, because it will become 0% VAT. So, no tax return any more.
The solar panel system
1. Solar panels
There are a few types of solar panels, monocrystalline, polycrystalline and thin-film. All with their advantages.
Monocrystalline solar panels
These are the black-coloured panels. You can recognize them because they have an aluminium frame. This type is used often because of their colour The efficiency of the solar panels is approximately the same as the polycrystalline blue panels, but they are slightly more expensive.
Polycrystalline solar panels
These are the blue panels. They are slightly cheaper than the monocrystalline ones. But they have generally the same efficiency as the crystalline ones. You can also choose red, purple or bronze but the efficiency is not as high as the blue ones.
Thin fill panels
This type of panels is increasingly used. The advantage of them is that you can bend them and that they are less harmful to the environment in the production phase. Their efficiency is not so good compared with crystalline panels, but they have a lot more possibilities. In some constructions, they are used as canopies, where the panels are used for shade also.
2. Mounting materials
It is obvious that there are materials needed to mount the solar panels. In our case, we have a flat roof. On a flat roof, the optimum is that the solar panels will be located in the south direction and are mounted with an angle of 15 degrees. Also, electrical wire electricity cable is involved and in most situations, there will be an addition to be made on the fuse box. In your situation, this can be different, of course.
This device will invert the generated electricity from DC to alternating current.
If your roof has some shadow on a certain time a day, it can be wise to install optimizers. They will take care that every panel are not limited in yield by other solar panels.
Calculate the yield of solar panels in the Netherlands
This is a more theoretical subject. A watt peak or Wp is used as an indicator for the efficiency of the solar panels. The efficiency is 0.9 kWh/Wp in a year in the Netherlands, in the optimum situation.
So in our case, we want to have 2700 kWh a year produced by the solar panels on our roof. So we need 2700 kWh / 0,9 kWh/Wp = 3000 Wp of solar panels.
The Wp per panel is depending on the size and efficiency of around 300 Wp at the moment. So, we need around 10 panels, depending on the kind of panels. Some years the sun will shine more than other years, so this is an estimate.
Installation of the solar panels
If you are an electrical engineer, you can do it yourself. In most cases, it is wise to ask a professional to install the solar panels. There are several reasons for it:
1. Guarantee period. Some companies only give you guarantee when the panels are installed by them.
2. Risk. There is always a risk that your roof will start leaking after installing, or that there is another damage. In most cases, the company is responsible.
3. Your own safety. Working on the roof and electricity needs extra precautions.
– Cleaning. The solar panels have a special coating, which is normally enough to clean them with just the normal rain. If the solar panels are getting dirtier, the window cleaner can wash the panels with osmosis water.
– The inverter needs replacement approximately every 10 years.
We got an offer for solar panels in 2019 and asked a new one in October 2020. Guess what? The difference between the two offers was 20%. But the other surprise was that there would be additional costs involved because our roof is too high to reach normal, due to safety reasons. We chose to accept this offer. Again, a step further in the process to live more sustainable.
The costs for a solar system, generating around 2700 kWh a year costs us €4.000,00 including 21% V.A.T. Including installing the panels. The estimate is that we earn this investment back in less than 6 years. So worth the investment.
In 2022, it was actually already 3-4 years to earn this investment back.
What a difficult blog to write. The ins- and outs of solar panels in the Netherlands are not that easy. Hopefully, this blog will guide you along the way. But I can imagine that is not enough.
Do you need help with understanding the Dutch documents? Or are you searching for advice for making your house more sustainable? Feel free to contact us.
Curious about the writer? Click here.
Thank you for the nice blog. it has good information.
In Maastricht, i was approached by Zonnepanelen Plus. (www.zonnepanelenplus.nl). Are you familiar with this company?
Thank you for your comment. No, I don’t know that company. I should look it up. Do you want to know if it is a reliable company? If so, I can check it for you.
Wow, very near and clear explanation for first timers. You made most of the clarification simple. Thank you very much.
Thank you for your comment Chad!
Do you know if I can buy solar panels for my home but choose to pay the cost spread over monthly installment? Any company you can recommend please who does that
Thank you for your comment. There are some possibilities. I know some municipalities can give you a loan for solar panels, with a good interest rate. Also, you can ask your mortgage advisor if it is possible to include this in the mortgage. Or, you can lease solar panels. However, I don’t know which company does that unfortunately. Good luck with the process!
The cost of electricity has increased about 5x since Jun 2019 on current Eneco variable contracts… so I calculated the repayment time of the solar panels is saving around €1944/year based on 2700kWh being produced by 10 panels. So the repayment time is now closer to 2 years…
Hi David, you are right. This blog needs an update! I will put this on my things to do list.
Thank you Marijke. Great post! very useful for us, expat people here! I have one question regarding the formalities for the installation. I am an electrical engineer by background so I think I can do the installation myself but how the approval works? Do I need to make an agreement with an authorised engineering company to submit the application and approve my setup or can I do this myself? Do you know how the regulation is on this?
Thanks for your time again.
Thank you for your comment. Good question. I don’t know the answer yet, but I will do some research for you in the next coming weeks. I will keep you updated!
I promised to come back to you. You are allowed (as far as I know) to install solar panels yourself. Without approval from a company. You don’t need approval, except in some cases. These cases are: if you want to place the solar panels at the front of your house (depending on the municipality), monuments and when you live in an apartment complex (VVE).
You can expect to get some questions when you want to sell your house. If so, that is the time for an installer to check the installation. Be aware that there are rules for electrical wires and setups etc. You can find them by googling “bouwbesluit”.
Quick question : I’ve a quote to install 9 panels of 400WP each but the installer on the day of installation showed up with 8 panels(due to some miscommunication) and only of 385WP. On being asked why not the 400WP they gave me two explanations :
1. If you install 400WP panels you need to upgrade from single phase to 3 phase setup.
2. the 385WP panels with optimizers will generate the same amount of KWh as the 400WP’s.
I wanted clarity on the 1st point. I understand my house is single phase setup with 230V and 16A(not sure of this), so how much power can be sent back to the grid?
The 400WP and 385WP both claim to generate about 3580 KWh per year. Can you please help me with this question? Do we need to upgrade to 3 phase if we go beyond a certain power generated by solar panels? Also all this power is not generated all at once but over a span of a year. So what is the threshold or cut off for staying on single phase or moving to 3 phase?
Thanks in advance.
I will send you a private message, as this is a very detailed question.
If you need 3 phase setup with 3x25A (which is the usual standard in the Netherlands) or 35A you can request this on this website: https://www.mijnaansluiting.nl/home .
Thank you for all your advice and comments. Can you advise me on suitable companies? And also why do you think different companies quote different amount of panels will fit on the roof?
Coolblue quote 6, Groeneplan 9, Solar Conept 10,
I believe all panels are closely the same size.
Thanks in advance
Thank you for your comment.
What a difference in the number of panels. Some companies are more creative in placing solar panels than others, or the panels they use have just different dimensions.
You already have 3 quotes, what about comparing the quotes? Or, just take a look at https://www.eigenhuis.nl/collectieve-inkoop-zonnepanelen#/. If you need help with comparing, just let me know.
Good luck with your decision.
Hello, thank you for this informative post.
Do you have the knowledge about current prices at the moment?
I’ ve got an 8400 euro offer for 8 solar panels for 425kw capacity. I think this is too much.
In 2022 the prices of solar panels increased by 50%. However, this seems a bit overpriced. My advice is to ask for about 3 offers and compare them on the quality of materials, guarantee period, terms and condition and price. Not only price.
Good luck, and if you need any help, just let us know.
Hello, me and my girlfriend are planning to install 10x Sun Power maxeon 6ac on our house but there are so many companies that we don’t really know which one too chose..
we also have some questions about the problems on the rooftop…
Thank you for your question. Can you send me an e-mail, so we can plan a call? In that way, I can help you way better.
With kind regards, Marijke