Become almost self-sufficient in renewable energy

With a Watts solar PV system you reduce your electricity bill and your carbon footprint, future-proof your home and become less dependent on an unpredictable energy market and fluctuating electricity prices.

It's good for the climate, good for the budget and just plain good.

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Become self-sufficient with a high-efficiency solar PV system

Produce your own free energy
With a photovoltaic system, you make your home self-sufficient. When the energy market price is high, you save money by producing and storing your own power, allowing you to avoid those hours when the power price is high and production is carbon heavy.

Renewable energy with optimised self-sufficiency
Of all the benefits of solar panels, the most important is that solar energy is a renewable energy source, and with a battery you ensure the optimal use of your solar cells. This means that the energy you produce yourself is always available to you and that you don't have to send large amounts of your power out onto the grid.

Become independent from the energy market
With a solar PV system, you create immediate savings by becoming less dependent on the energy market and fluctuating electricity prices.

Make a difference
By investing in a solar PV system, you make a significant difference to the climate, once and for all. Solar PV is a climate-friendly alternative to all other energy sources and you contribute to the green transition.

Sell your surplus power
If you produce more solar energy than your household battery can store, you can make money by selling the excess power to the grid.

Prepare your home for the future
By investing in a solar PV system, you can future-proof your home through maximum self-sufficiency and minimum carbon footprint. It will provide a stable and secure return and increase the market value of your home.

Solar PV is suitable for your home if:

Intelligent management of renewable energy

We have invented an intelligent shortcut to greener energy consumption for Danish homeowners. We're launching Watts Homegrid, your very own automated renewable energy system.

The energy comes from solar cells on the roof, while the brain of the whole system is in the engineering cabinet: a patented algorithm that constantly calculates and optimises consumption in a steady flow between home battery and occasional purchases and sales to the public grid.

Sign up for our newsletter here to learn more about Watts Homegrid and get notified when we are ready to install in your area.

From idea to smart energy solution

Frequently asked questions

How do solar cells work?

We can harness the light energy from the sun via solar cells and convert it into electricity. The amount of energy we can harness varies depending on where the solar cells are located. In Denmark, photovoltaic systems are able to convert about 20% of the energy from sunlight.

The solar cells are assembled into a panel consisting of a number of solar cells, there will typically be between 30 - 80 solar cells in a single panel.

There are different types of solar cells. The most popular are crystalline, which means both mono- and polycrystalline solar cells. There are also amorphous solar cells, such as. thin-film solar cells, typically known from a calculator.

Monocrystalline solar cells
They have only one silicon crystal, and the corners can be either square or round. They have an efficiency of up to between 20 - 23%, which is at the high end.

Polycrystalline solar cells
They have several silicon crystals and are square. More crystals in the solar cell can give the impression that the surface is a little more alive. The efficiency is slightly lower than monocrystalline solar cells.

Thin film/ amorphous solar cells
The amorphous solar cells are based on amorphous silicon. They are less efficient than crystalline solar cells and therefore cheaper. They come in several shapes and colours.


How efficient are solar cells?

In Denmark, solar cells are usually most efficient in the bright summer months. During this period, they will be able to convert about 20% of the sun's energy into electricity. Efficiency is greatly influenced by location. The highest efficiency will typically be achieved with south-facing panels at 45 degrees. We recommend that you consult with our solar specialists in Watts regarding the best location for solar panels on your property.

What does it cost to get solar cells?

The average price for the purchase of a photovoltaic system and installation is around DKK 70,000 - 120,000 for a detached house with an annual electricity consumption of around 4,000 kWh, including assembly and installation. The price can vary according to size, efficiency and type.

A 6 kW solar PV system has an annual production of about 5,800 to 6,000 kWh per year. It could cover an average household's annual energy consumption, and possibly also be able to sell the excess power.

How long is the payback period for a solar PV system?

There are a number of factors that influence the payback period, but it will typically be 7 to 10 years.

An important factor in the efficiency is how much power the home uses from the solar cells. If a household battery and possibly an electric car are connected, you will be able to store the electricity for, say, the evening when your solar cells are not producing power and this will shorten the payback period significantly.

How much does a battery cost? And is it worthwhile to connect it to the system?

The price of a battery increases with its size. Expect batteries to cost from DKK 40,000 to DKK 115,000, depending on how big a battery you want (5.1 kWh to 22.1 kWh.) Often the battery is sold as part of a package price, so there is an overall discount.

Get a quote for a solar PV system

You need a price you can trust. Our solutions are tailor-made for you, sized according to your needs, your home's specifications and, most importantly, your future plans.

Sign up to be contacted by our experts and get guidance on the right energy solution for you. You can also call our solar specialists on 70292044.


With Winaico WST-MGX-P1 GEMINI FULL BLACK solar cells, you get a proven solar cell that is approved with the highest certifications and recognized with numerous international awards for its constant product innovation. Most recently the award for 'Top Brand' of the year 2022 from the internationally renowned institute EUPD in Germany.

Maximum production with minimum loss
Winaico solar cells are designed with the latest half cell technology that has a proven effect on power production. The special layout of the solar panel reduces power loss during energy production, ensuring that you get maximum output with minimum loss.

One of the most highly efficient solar panels on the market
Power loss reduction and the use of PERC technology ensure that Winaico solar modules can guarantee one of the highest efficiencies on the market. They come with a guaranteed efficiency of up to 20.93 percent.

Guaranteed high performance after 25 years
Winaico solar cells are among the most thoroughly tested on the market, so you're guaranteed up to 85% performance after 25 years of use.

Full reliability with 25 year product warranty
Winaico's solar cells are not only the most tested on the market and honoured with international awards for their high efficiency. It also comes with a 25-year product warranty, should your solar cells deviate from the norm.

Specifications - WINAICO WST-MGX-P1 Full Black | WINAICO WST-MGX-P1 Series
Operating temperature: -40°C to +85°C | -40°C to +85°C
Maximum system voltage: 1500V | 1500V
Maximum fuse rating: 25A | 25A
Maximum design load: 3600 Pa/1600 Pa | 3600 Pa/1600 Pa
Maximum test load: 5400 Pa/2400 Pa | 5400 Pa/2400 Pa
Nominal module operating temperature (NMOT): 43.85 ± 3°C | 43.85 ± 3°C
Temperature coefficient of PMAX: -0.35%/°C | -0.35%/°C
Temperature coefficient of VOC: -0.28%/°C | -0.28%/°C
Temperature coefficient on ISC: 0.04%/°C | 0.04%/°C

Electrical specifications (STC tested) - WINAICO WST-MGX-P1 Full Black | WINAICO WST-MGX-P1 series
Rated output: 400Wp | 410Wp
Voltage at maximum performance: 31.06V | 31.30V
Current at maximum performance: 12.88A | 13.10A
Open circuit voltage: 37.29V | 37.32V
Short circuit current: 13.69A | 13.93A
Module efficiency: 20.42% | 20.93%

Mechanical specifications - Same for the whole series
Cells: monocrystalline silicone cells
Number of cells: 6 strings of 18 cells
Dimensions: 1726 x 1135 x 35 mm
Weight: 21.5 kg
Glass thickness: 3.2 mm
Frame: Black anodized aluminium
Junction box: IP68
Connector type: QC4.10 IP68 (compatible with MC4)


BYD Battery Box is receiving international praise from users around the world. It has also been named Battery of the Year in the 'Storage' category by the market's most internationally recognised institute, EUPD. BYD has won the Top Brand title here every year since 2020, but also stands out for several other advantages:

-High efficiency
-Long battery life
-Flexible systems
-Maximum safety
-High environmental friendliness
-Extra robust design

BYD Batteries come in different buildable modules within two different battery series. This provides total flexibility and creates maximum opportunities for customised solutions.

Maximum efficiency and extended lifetime
The BYD Battery Box not only provides optimal storage of your home-generated solar energy, its special battery construction also ensures an extra long life.

Scalable systems for full flexibility
BYD Batteries come in scalable modules, so we can always find the solution that best suits your home and your solar setup.

Safe and environmentally friendly battery technology for the home
BYD batteries are created without heavy metals and therefore offer one of the most environmentally friendly solutions on the market. With the highest safety certifications, you also get a battery that is tailored and thoroughly tested for safe operation in the home.

Particularly suitable for the Nordic climate
BYD battery box is created with a special lithium-iron phosphate technology (LiFePO technology) that makes the battery extra powerful, but also extra hardened and robust in harsher climates.

Specifications of the HVS series:
Battery models: HVS 5.1, HVS 7.7 and HVS 10.2
Battery technology: cobalt-free lithium iron phosphate
Modules: from 2 to 4 modules
Capacity per battery: from 5.1 kWh to 10.24 kWh (can be scaled up to 30.72 kWh by connecting up to 3 identical batteries from the same series)
Maximum output: 25A
Rated voltage: from 204.8V to 409.6V
Operating voltage: from 160~240V to 320~480V
Dimensions: from 762 x 585 x 298 mm to 1228 x 585 x 298 mm
Weight: from 91 kg to 167 kg
Operating temperature: -10 degrees to +50 degrees
Communication: CAN/RS485
Certification: VDE2510-50 / IEC62619 / CEC / CE / UN38.3
Warranty: 10 years

HVM series specifications:
Battery models: HVM 11, HVM 13.8, HVM 16.6, HVM 19.3 and HVM 22.1
Battery cell technology: cobalt-free lithium iron phosphate
Modules: from 4 to 8 modules
Capacity per battery: 11.04 kWh to 22.8 kWh (can be scaled up to 66.24 kWh by connecting up to 3 identical batteries from the same series)
Maximum output: 50A
Rated voltage: from 204.8V to 409.6V
Operating voltage: from 160~236V to 320~472V
Dimensions: from 1228 x 585 x 298 mm to 2160 x 585 x 298 mm
Weight: from 167 kg to 319 kg
Operating temperature: -10 degrees to +50 degrees
Communication: CAN/RS485
Certification: VDE2510-50 / IEC62619 / CEC / CE / UN38.3
Warranty: 10 years

Fronius Symo Gen24 Plus inverter

Fronius is one of the market's most recognised manufacturers, having made its mark since 1945 with revolutionary innovations in battery charging, welding technology and later solar energy. Fronius produced the first inverter for solar cells back in 1995 and is today considered a pioneer in the field.

Guaranteed safe operation of your solar system
All Fronius inverters have several built-in safety features to ensure that your solar energy production runs smoothly and uncomplicatedly. One of them is the integrated cooling system, which is activated as soon as the system runs the risk of overheating. In addition, the inverter can disconnect the system from the grid in case of emergency.

Longer lifetime
As a result of the intelligent cooling system, Fronius inverters are not stressed to the same extent as other inverters on the market. This has the direct effect that Fronius inverters have a longer lifetime than many of its competitors on the market.

Unique safety solution with emergency power
With Fronius inverters, you also get the option of choosing an inverter with a unique emergency power solution. Few inverters on the market provide a backup solution in the event of a power failure, but Fronius does. This way you are guaranteed continuous power even when the grid should fail for short periods

Energy classes: | 6,0kW | 8,0kW | 10kW
Maximum DC power: 6|
DC input voltage: 80V-1000V
MPP voltage range: 80V-800V
MPP inputs/strings per MPP input: 2/1
Maximum input current per MPP input: 25A/12.5A
AC power Pn / Smax: 6000W/6000VA | 8000W /8000VA | 10000W/10000VA
Maximum AC output current: 16.4A
Efficiency ηmax / ηEU: 98.1%/97.1%
Width/Height/Depth (mm): 527/594/166
Weight: 25-27 kg
Product warranty: 5 years with possibility of up to 15 years

Download data sheet here

Kostal Plenticore Plus inverter

We carry Kostal's most versatile and most award-winning inverters on the market. Kostal Plenticore Plus. There is a choice of four energy classes ranging from 5.5kW, 7.0kW, 8.5kW and 10kW. The choice of inverter model depends on your household and solar setup, which we will of course advise you on.

Award-winning efficiency
The Kostal Plenticore Plus inverter has for several years reaped numerous awards for its efficiency in optimizing and storing energy, including top SPI ratings in all nominations by the internationally recognized Stromspeicher Inspektion in Germany.

Intelligent shade management ensures maximum yield
Kostal's three-phase inverters have built-in shade management to ensure your solar cells always perform at their best. If a tree casts a random shadow over the PV system, the inverter will adjust the modules so that they still perform optimally.

Versatile and user-friendly inverter
With its easy availability, easy maintenance and great ease of use, it is a safe inverter choice for any household solar setup, large or small.

Energy classes: | 6,0kW | 8,0kW | 10kW
Maximum DC power: 6|
Maximum DC input voltage: 80V-1000V
MPP voltage range: 80V-800V
MPP inputs/strings per MPP input: 2/1
Maximum input current per MPP input: 25A/12.5A
AC power Pn / Smax: 6000W/6000VA | 8000W /8000VA | 10000W/10000VA
Maximum AC output current: 16.4A
Efficiency ηmax / ηEU: 98.1%/97.1%
Product warranty: 5 years with possibility of up to 15 years
Can be installed indoors and outdoors
Dimensions are 52.7 x 59.4 x 16.6 cm (WxHxD)
Weight: 25-27 kg
Ambient temperature between -25°C to +60°C

Download data sheet here

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