An industrial solar system really costs CHF 1'200-1'800 per kWp; a 500 kWp system therefore CHF 600'000 to 900'000. Roof condition, structural engineering and grid connection explain the range; hidden cost drivers such as transformer upgrades (CHF 20'000-80'000) or lightning protection (CHF 5'000-15'000) come on top for existing buildings. After deducting the GREIV subsidy of up to 30%, and at 70% self-consumption, the system pays back in 4-6 years.
Key Takeaways
8 min read
Key Takeaways
8 min read- CHF 1'200-1'800 per kWp: that is the real investment range for industrial solar systems. The spread comes from roof condition, structural engineering and grid connection.
- 4-6 years payback: achievable with the GREIV subsidy (up to 30%) and high self-consumption. After that, 20+ years of almost free electricity.
- Hidden cost drivers: grid connection upgrade, roof renovation and lightning protection are often underestimated or left out of quotes.
- Data basis: analysis of the 196 large-scale systems delivered by Ampere Dynamic since 2020 (as of 2026-09).
Most cost comparisons for solar systems stop at the module price. That leads to systematic miscalculations: businesses budget one figure and receive a quote for another. This analysis draws on Ampere Dynamic’s experience with 196 large-scale installations since 2020 to give a realistic picture of the total cost over five years. From planning to ongoing operation.
Investment range for a 500 kWp system
A 500 kWp industrial system costs between CHF 600’000 and CHF 900’000, depending on the starting situation. The range breaks down into five main cost blocks:
Modules (35-40%): The market standard is monocrystalline bifacial modules. Lightweight modules for structurally weak roofs cost 15-25% more but avoid expensive structural work.
Inverters and electrical (15-20%): String or central inverters, DC cabling, AC connection. The effort rises with large systems and dispersed roof areas.
Mounting and substructure (20-25%): Aluminium racking, roof penetrations, installation labour. On high-bay warehouses with lightweight or pitched roofs this block grows because access is harder.
Planning, permits, grid connection (10-15%): Engineering, grid connection application, building permit, GREIV subsidy application to Pronovo. For systems from 500 kWp that need a transformer, this block rises considerably.
Contingency (5-10%): Experience shows that existing buildings always bring surprises: unknown cable routes, tightened fire protection requirements, undocumented roof penetrations.
Hidden cost drivers that make projects more expensive
Ampere Dynamic identifies these items systematically in the preliminary study. Whoever discovers them during installation pays more.
Grid connection upgrade: If the existing connection capacity is insufficient for feeding in or for the self-consumption of the solar electricity, a transformer or cable upgrade costs CHF 20’000-80’000. Mainly affected are systems from 300 kWp in areas with a weak distribution grid.
Roof renovation: Many industrial roofs are 15-20 years old. Before the modules go on, leaking or load-weak areas have to be renovated. The building owner bears that cost, not the solar project. Quotes often leave it out.
Lightning protection: Integrating the PV system into the building’s existing lightning protection is mandatory and typically costs CHF 5’000-15’000, depending on building size and the existing installation.
Monitoring and maintenance: CHF 3’000-8’000 per year for professional operations management sounds like an extra cost. In the 5-year balance it is an investment: lost yield from undetected faults regularly exceeds the O&M costs.
5-year balance: payback and return
For a 500 kWp system operated by a typical manufacturing business, the calculation looks like this:
Investment: CHF 600’000-900’000 (gross)
GREIV subsidy: The GREIV programme (grosse Einmalvergütung, the large-scale one-off payment) from Pronovo covers up to 30% of the eligible investment costs. For a 500 kWp project that reduces the net investment to CHF 420’000-630’000.
Annual savings: At 70% self-consumption, 350’000 kWh of grid electricity at 20-30 Rp./kWh are replaced by solar electricity at 8-12 Rp./kWh. That yields annual savings of CHF 40’000-110’000, depending on the local electricity tariff and self-consumption ratio.
Payback: 4-6 years (net after GREIV). After that the system delivers 20+ years of almost free electricity, because the module warranty (25+ years) exceeds the payback period many times over.
Return after payback: Ongoing savings of CHF 40’000-110’000 per year against O&M costs of CHF 3’000-8’000 per year give a long-term net return that no market-dependent investment offers.
For a detailed analysis of sector-specific load profiles and self-consumption ratios in manufacturing: Photovoltaics for manufacturing businesses. All available subsidy programmes and bonus supplements explained: Subsidy Guide 2026.
Why the range is so wide
Two project types compared by cost
| Feature | Ideal project (new build) | Existing building with special measures |
|---|---|---|
| Roof condition | New flat roof, fully load-bearing | 15 years old, partial renovation required |
| Structural engineering | Designed for 15-20 kg/m2 additional load | Structural survey and reinforcement needed |
| Grid connection | Sufficient connection capacity available | Transformer upgrade CHF 30'000-60'000 |
| Module choice | Standard modules (glass-foil) | Lightweight modules +15-25% surcharge |
| Lightning protection | New system, simple integration | Existing installation, elaborate adaptation |
| Investment per kWp | CHF 1'200-1'350 | CHF 1'550-1'800 |
The difference between the two scenarios is up to CHF 600 per kWp. For a 500 kWp system that is CHF 300’000. Enough to consume almost the entire GREIV subsidy. Whoever quotes without a preliminary study risks an unpleasant surprise after the tender.