Is 2026 the right time for your business to invest in solar PV?

In 2026, the wider energy market makes this approach increasingly relevant. Solar generation continues to expand across Europe, electricity prices vary significantly between hours, and flexibility is becoming more important as renewable generation grows.

For a business considering a 200–500 kWp PV system, the starting point should therefore be your own electricity consumption.

How much of the electricity you currently buy from the grid could you generate yourself?

Why does self-consumption matter?

A PV system generates electricity primarily during daylight hours. If your business is consuming electricity at the same time, that energy can be used directly on site instead of being purchased from the grid.

For a factory, warehouse, logistics facility or commercial building, this could mean supplying production equipment, refrigeration, HVAC systems, lighting or other electrical loads directly from your solar installation. The more PV electricity you can consume directly, the more relevant the system becomes from an energy-cost perspective.

This is why the important question is not simply how much electricity your PV system can produce., but the more useful question is how much of that production can actually serve your business?

Your consumption profile, operating schedule and electrical infrastructure all influence the answer. A technical assessment should therefore come before the final system design.

How do you determine the right PV system size for your business?

There is no standard PV system size that works for every 200–500 kWp application.

A 200 kWp system may be appropriate for one site, while another business may have the consumption profile and available infrastructure to justify 400 or 500 kWp.

The right capacity depends on several factors:

• your annual electricity consumption;
• when electricity is consumed during the day;
• your production or operating schedule;
• available roof or ground area;
• shading and site conditions;
• existing electrical infrastructure;
• expected PV production;
• the share of production that can be consumed directly;
• future changes in electricity demand.

The hourly load profile is particularly important.

If your facility operates mainly during daylight hours, a significant share of solar production may be consumed directly. If a large part of your electricity demand occurs in the evening, at night or during weekends, the relationship between PV generation and consumption changes.

This is why your PV system should be sized around your consumption profile, not simply around the available roof area.

The objective is not to install the largest possible system. It is to find the capacity that creates the right balance between generation, self-consumption and investment.

Your existing electrical infrastructure matters as well. Connection capacity, distribution equipment, protection systems and the way the PV system integrates with the site’s electrical network can all influence the final design.

How much electricity can your commercial PV system generate?

The answer depends on the system capacity, location, orientation, inclination, shading, equipment and overall system design.

But annual production is only one part of the investment equation.

Imagine two businesses with similarly sized PV systems and similar annual production. If one consumes most of its electricity during the hours when the PV system is producing, while the other has most of its demand outside those hours, the value of the solar production can be very different.

That is why a commercial PV feasibility assessment should not look only at annual generation.

It should compare PV production with your actual consumption profile.

This analysis can also reveal opportunities beyond the PV system itself. Depending on your operating pattern, adjusting energy use, introducing energy management or adding battery storage may increase the amount of solar electricity that can be used on site.

How does solar PV reduce your electricity costs?

The basic mechanism is straightforward. You currently purchase electricity from the grid. A PV system generates part of that electricity on your site. Whenever you consume that electricity directly, you reduce the amount that needs to be purchased from the grid. The financial value of the system therefore depends on more than the installed capacity.

Your business case should connect:

• electricity consumption
• hourly consumption profile
• PV production
• self-consumption
• investment cost
• financing
• operating and maintenance costs
• long-term system performance

Electricity prices are also part of the equation. The value of each kilowatt-hour generated by your PV system depends largely on what electricity purchase it replaces. This is why payback cannot be reduced to a generic number that applies to every business.

A serious business case should connect the technical design with the financial model: expected production, self-consumption, avoided grid purchases, surplus energy, operating costs and long-term performance. That is the difference between simply pricing a PV installation and evaluating an energy investment.

What happens when you produce more solar energy than you need?

Your consumption and PV production will not always match.

You may have periods during the middle of the day when solar production is high but electricity demand is lower. The same can happen during weekends, holidays or periods of reduced activity. Depending on your system configuration and applicable connection and market arrangements, surplus electricity can be delivered to the grid.

But if your objective is self-consumption, surplus should not be the starting point of the business case. The first objective is to maximise the amount of solar electricity that creates value on your site.

If the analysis shows that a significant amount of production would otherwise remain unused, several solutions can be considered: adjusting the PV capacity, changing how certain loads are operated, introducing energy management or adding battery storage.

The right solution depends on your actual consumption pattern.

When does PV + BESS make sense for your business?

Battery storage becomes particularly relevant when your solar production and electricity consumption do not occur at the same time.

For example, your PV system may generate significant electricity around midday, while your facility continues to consume substantial amounts of electricity later in the afternoon or evening. A battery can store part of the available solar energy and make it available when your site needs it. The result can be a better match between generation and consumption and, potentially, a higher level of self-consumption. But a battery should not automatically be added to every PV project.

The relevant question is whether your consumption profile creates a clear value for shifting electricity from one period to another.

For some businesses, the right solution may simply be a well-sized PV system. For others, PV combined with BESS and energy management may create a stronger overall energy solution. This is one of the areas where the role of an energy integrator becomes important: the technology should follow the site’s needs, not the other way around.

What should you analyse before investing in solar PV?

Before deciding on a commercial PV system, look at five fundamental questions:

1. How much electricity do you consume?
Review your historical electricity consumption and costs.

2. When do you consume it?
Analyse your hourly load profile, not just your annual consumption.

3. How much PV can your site accommodate?
Consider available space, shading, structural conditions and electrical infrastructure.

4. How much of the PV production can you consume directly?
This is one of the most important indicators for a self-consumption project.

5. Would battery storage improve the match?
If a significant part of your demand occurs outside solar production hours, BESS may deserve a detailed evaluation.

These answers should shape your system design. They should also determine what happens beyond the solar panels: how the PV system connects to your existing electrical infrastructure, how it is monitored, how performance is maintained and whether storage or energy management can create additional value.

Is 2026 the right time to invest in solar PV?

For a business with significant electricity consumption, the opportunity is not simply about producing renewable energy. It is about producing a larger share of the electricity you already need — and using that electricity where it creates the most value for your business.

For a 200–500 kWp project, the right starting questions are therefore simple: What do you consume? When do you consume it? How much can you generate on site? How much can you use directly? And would storage improve the equation? The answers should determine the system, not the other way around.

At Wiren, we approach commercial solar from that perspective. We analyse the relationship between your consumption profile, PV generation, existing electrical infrastructure and the way your site actually operates. Where the business case supports it, we can also evaluate battery storage, energy management and the requirements for long-term monitoring and maintenance.

The objective is not simply to install a PV system, but to design an energy system that works with the way your business operates and continues to create value after commissioning. Because the objective of commercial solar is to make a larger share of the electricity your business already needs available from your own energy system.