# The True Cost of an Industrial Solar System: A 5-Year Balance Sheet

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.

What does an industrial solar system really cost? Analysis of the installations delivered since 2020: CHF 1'200-1'800/kWp, hidden cost drivers, the GREIV subsidy and payback in 4-6 years.

Kanonische Seite: https://www.ampere-dynamic.ch/en/knowledge/true-cost-industrial-solar-system/
Veröffentlicht: 2026-02-03

**Key Takeaways**

- 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

- **1'200 CHF/kWp** — Lower end of the range under ideal conditions (new-build flat roof, good grid connection)
- **1'800 CHF/kWp** — Upper end of the range with special measures (structural work, grid expansion, lightweight modules)
- **30 %** — Federal GREIV subsidy for systems from 100 kWp (up to)

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](https://www.ampere-dynamic.ch/en/knowledge/glossary/einmalverguetung/) 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](https://www.ampere-dynamic.ch/en/knowledge/glossary/eigenverbrauch/) 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.

> **Spot the cost drivers early**
>
> Ampere Dynamic identifies the grid connection situation, roof condition and structural requirements in the preliminary study, before you invest. [More on the preliminary study](https://www.ampere-dynamic.ch/en/services/preliminary-study/)

## 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](https://www.ampere-dynamic.ch/en/knowledge/photovoltaics-manufacturing-businesses/). All available subsidy programmes and bonus supplements explained: [Subsidy Guide 2026](https://www.ampere-dynamic.ch/en/knowledge/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.