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Expand Solar Panels Or Buy A Home Battery? The Ultimate Guide for the Netherlands

More and more Dutch households are generating their own electricity with solar panels. You contribute to a greener future and save on your energy bill. Fantastic! But with the upcoming changes to the net metering scheme, a crucial question arises for many homeowners: what is the smartest next step to optimise your self-consumption? Should you expand your solar panels or is it time to buy a home battery? This decision guide will help you make the right choice, specifically tailored to the Dutch situation.

The time when you could feed unlimited electricity back into the grid and be reimbursed at the same rate as the electricity you drew from it is coming to an end. The net metering scheme will cease completely on 1 January 2027. This means it is becoming increasingly important to consume as much of the generated solar energy directly yourself as possible. Increasing your self-consumption is the key to lasting savings and independence. Let’s examine the options in depth.

The Changing Net Metering Scheme: Why Choose Now?

For years, the Dutch government has encouraged the installation of solar panels through the net metering scheme. This scheme made it financially attractive to generate more electricity than you directly consumed, as you were allowed to offset the electricity fed back into the grid against the electricity drawn from it. This system ensured a straightforward payback period for many solar panel owners.

However, the success of the net metering scheme has also led to an overload of the electricity grid on sunny days and during periods of high production. To relieve the grid and accelerate the transition to a sustainable energy system, the net metering scheme will cease completely on 1 January 2027 (the previously planned phase-out path from 2025 has been cancelled). This specifically means that the compensation for electricity fed back into the grid will decrease annually until the scheme has completely disappeared in 2031. From then on, you will only receive a reasonable feed-in tariff from your energy supplier, which will likely be lower than the price you pay for electricity drawn from the grid.

This development forces us to consider how we can utilise the solar energy we generate more efficiently. Maximising your self-consumption of solar energy is becoming essential. This is precisely why the choice between expanding solar panels and buying a home battery is more relevant than ever. It’s about optimising your investment in sustainability for the long term, with an eye on the future energy market.

Option 1: Expanding Solar Panels – More Yield, More Self-Consumption

Do you still have roof space available and simply want to generate more electricity? Then expanding solar panels is a logical and often cost-effective first step. This option is particularly interesting in the following situations:

Your Current Consumption Exceeds Your Production: If your solar panels currently do not generate enough electricity to fully cover your annual consumption, extra capacity is a direct solution. This is especially relevant if you plan to increase your electricity consumption, for example, by purchasing an electric car, a heat pump, or air conditioning.
Optimisation of Direct Self-Consumption: By installing more panels, you increase total production on sunny days. This means you can use more electricity directly during the day for household appliances, such as the washing machine, dishwasher, or an electric boiler. The more you consume directly, the less you need to draw from the grid, and the less you need to feed back.
Cost-Benefit Analysis: The marginal costs for extra panels can be lower than the cost per panel for the initial installation because part of the installation costs (inverter, cabling) has already been incurred. This potentially improves the payback period of the expansion.

Advantages of more solar panels:

Higher total annual electricity production.
Relatively easy to install if roof space and inverter capacity are still available.
Lower CO2 footprint due to more self-generated green electricity.
Direct impact on your energy bill through reduced draw from the grid.

Points for consideration:

The benefits of feeding surplus electricity back into the grid are diminishing now that the net metering scheme ceases on 1 January 2027.
Without storage (such as a battery), you do not directly benefit from the extra electricity generated during the day in the evening or at night, unless you feed it into the grid.
Check the capacity of your current inverter. It may also need to be replaced or expanded.

Expanding solar panels is an excellent way to increase your energy independence and benefit from the Dutch sun. Always ask a specialist to assess whether your roof is suitable for additional panels and what the optimal configuration would be.

Option 2: Buying a Home Battery – Storage and Independence

Suppose you already have enough solar panels to cover your annual energy consumption, but you notice that you feed a lot of electricity back into the grid during the day and have to draw electricity from the grid in the evenings. In that case, buying a home battery may be the most interesting option to drastically increase your self-consumption. A home battery stores the surplus electricity that your solar panels generate during the day, so you can use it in the evening or on less sunny days.

When is a home battery a good choice?

Maximising Self-Consumption: This is the primary reason. You reduce the amount fed back into the grid and need to draw less electricity, which is becoming increasingly important now that the net metering scheme ceases on 1 January 2027. You use your own green electricity when you need it.
Greater Independence from the Grid: A battery increases your degree of self-sufficiency. Although the Netherlands has a very reliable electricity grid, a battery offers an extra layer of security and independence.
Preparation for Dynamic Tariffs: With a home battery, you may be able to benefit from dynamic energy contracts in the future. You charge the battery with cheap electricity (for example, from your own solar panels or from the grid during off-peak hours) and use it when electricity prices are high. This increases potential savings.
Sufficient Solar Panel Capacity: If your solar panels already produce more than enough for your direct consumption during the day, a battery is the ideal way to make this overproduction useful.

Advantages of a home battery:

Significantly increases your self-consumption of solar energy (up to 70-80%).
Reduces dependence on the energy grid and fluctuating energy prices.
Contributes to grid stability by reducing peaks in feed-in.
Future-proof: anticipates the end of net metering (1 January 2027) and the rise of dynamic tariffs.

Points for consideration:

High Initial Costs: The purchase and installation of a home battery is currently still a significant investment. Although prices are falling, the payback period in the Netherlands without subsidies is still relatively long.
Lifespan and Capacity: Determine the right battery capacity that suits your consumption profile and solar panel yield. The lifespan of batteries is limited.
Subsidies: Currently, there are no national subsidies in the Netherlands for the purchase of home batteries for private individuals, although there are sometimes local initiatives. This can affect the payback period.

The choice for more solar panels or a home battery strongly depends on your current situation and future ambitions. A home battery is a powerful tool to elevate your sustainable energy management and prepare for the energy transition.

The Calculation: An Example and Points for Consideration

Let’s take a hypothetical example to make the choice between expanding solar panels and buying a home battery concrete.

Suppose you have an annual electricity consumption of 3,500 kWh. You currently have 10 solar panels that together generate 3,000 kWh per year.

Scenario A: Expanding solar panels with 4 extra panels.
- You still have roof space, and your current inverter can handle the extra panels.
- The 4 extra panels yield another 1,200 kWh per year.
- Your total production increases to 4,200 kWh.
- You now comfortably cover your own consumption of 3,500 kWh and feed 700 kWh back into the grid.
- Advantage: You buy less electricity, and especially now that the net metering scheme is ceasing, the energy bill is significantly lower. The investment is relatively limited if the infrastructure is already in place.
Scenario B: Buying a home battery (for example, 5 kWh usable capacity).
- You continue to produce 3,000 kWh per year, and directly consume approximately 30% of this. That is 900 kWh.
- The remaining 2,100 kWh is now largely fed back into the grid.
- With a home battery, you can store a large portion of that 2,100 kWh during the day and use it in the evening. Suppose this allows you to increase your self-consumption from 30% to 70%.
- Your direct consumption becomes 900 kWh + (70% of 2,100 kWh) = 900 + 1470 = 2,370 kWh.
- Advantage: Your self-consumption increases dramatically, making you much less dependent on the grid for your evening electricity needs. The remaining 630 kWh of the 2,100 kWh that was previously fed back can still be fed back into the grid.

Crucial Points for your decision:

Current and Future Energy Consumption: How much electricity do you currently consume, and do you expect to consume more in the future (for example, due to electric driving or a heat pump)? Higher consumption often argues for expanding solar panels.
Available Roof Space: Do you still have sufficient (shadow-free) space on your roof for extra panels?
Budget and Payback Period: How much are you willing to invest and what payback period is acceptable to you? The investment in extra panels is generally lower and has a shorter payback period than a home battery, especially since there are no subsidies for home batteries for private individuals.
Degree of Independence: How important is it to you to be less dependent on the energy grid and fluctuating tariffs? If this is a high priority, a home battery is a stronger consideration.
Technical Feasibility: Have a specialist assess whether your meter cupboard and inverter are suitable for more solar panels or a home battery.

It is clear that there is no universal “best” answer. Your specific situation, your consumption pattern, your budget, and your sustainability goals determine the most profitable and impactful choice.

Conclusion: The Best Choice Is Personal

The end of the net metering scheme on 1 January 2027 marks a significant shift in how we deal with solar energy. It encourages us to be proactive and optimise our own energy consumption. The choice between expanding solar panels and buying a home battery is a strategic one that depends on various factors.

If your current solar panels do not yet meet your full energy needs, or if you expect a significant increase in consumption, then expanding solar panels is probably the most direct and economical step. You produce more green electricity and directly lower your energy bill.

If, on the other hand, you already have a surplus of solar energy during the day and want to maximise your self-consumption, then buying a home battery offers the ultimate solution to store that excess energy and use it when you need it. It increases your independence and prepares you for a future with dynamic energy prices.

In many cases, a combination of both may even be the most ideal solution in the long run, where you first optimise the panels and then add a battery. The most important thing is that you make a well-considered decision that suits your unique situation.

Ready to take the next step in your sustainable energy supply?

Let our experts help you make the right choice. Whether you are considering expanding solar panels or buying a home battery, we offer personal advice and a customised quote, specifically for your home and energy needs.

Request a free consultation today and discover how you can optimally benefit from your own generated solar energy in the changing Dutch energy landscape!

Going for a home battery instead? Check out the plug-in home battery from Zendure (SolarFlow), which connects to your existing inverter and installs without major renovation work.

Read also: our guides on solar panels and the home battery.