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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,701 companies indexed · Last updated: today
DirectoryEnergy & EnvironmentSolar & PhotovoltaicsChurSonnbau AG
Sonnbau AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of Sonnbau AG is the planning, installation and optimization of photovoltaic systems, particularly for self-consumption of solar power. The company offers solutions for the generation and storage of solar power, including the planning and installation of solar power plants, optimization of system sizes and implementation of storage systems such as the BYD storage system. Additionally, the company supports the establishment of self-consumption communities and provides consulting and planning services for the use of solar power in various application areas, such as condominiums or small businesses.

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Offering

Products & services

Industry:Solar & Photovoltaics
✓ Offered3
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3.9/5

Sonnbau AG

Solar power plants
Solar power plants for roofs, balconies and new-builds, including grid connections, battery power supply and off-grid systems; planning for self-consumption, ZEV and developments.
Optisizer
Optisizer for analyzing consumer profiles, load profile measurements, yield assessment of photovoltaic systems, and simulation of battery units as well as their profitability.
Solevator
Solevator, custom-made mounting frames for photovoltaic systems, as an accessory or system component for installing solar modules.
Trust & reputation

ranQ Trust Score of Sonnbau AG: 3.9 out of 5.0

Trust Score3.9/ 5.0

High

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Data basis 96% · As of October 2026

Sonnbau AG scores 57.6 out of 100 points in the Reputation area of the ranQ Trust Score. This area carries 42% of the weighting.
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CriterionValueWeight
  • Review quality: The average rating across all connected sources, smoothed against the industry mean. So 5.0 stars from three reviews do not outrank 4.7 from three hundred.72.124%
  • Review volume: The number of reviews across all sources. The scale is logarithmic: the first reviews count the most, and the maximum is reached at 50 reviews.40.910%
  • Review recency: The age of the most recent review. Two-year-old reviews deliberately sit in the middle, because that is normal for Swiss SMEs. Only after three years without a new voice does the value drop markedly.35.08%
Sonnbau AG scores 79.8 out of 100 points in the Substance area of the ranQ Trust Score. This area carries 28% of the weighting.
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CriterionValueWeight
  • Establishment: Years since founding or brand launch, logarithmic. The maximum is reached at 15 years.86.512%
  • Company size: The headcount band, researched by ranQ or stated by the company. It is scored in steps rather than by head count, because the data only provides bands.55.07%
Sonnbau AG scores 85.0 out of 100 points in the Identity area of the ranQ Trust Score. This area carries 22% of the weighting.
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CriterionValueWeight
  • Verification: Official register entry (commercial register with UID or professional-body record, 55 points), confirmed domain (20 points) and confirmed ranQ profile (up to 25 points, depending on completeness).85.022%
Sonnbau AG scores 5.7 out of 100 points in the Visibility area of the ranQ Trust Score. This area carries 8% of the weighting.
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CriterionValueWeight
  • Website authority: Ahrefs' Domain Rating measures, on a scale of 0 to 100, how strongly a website is linked from other websites. For Swiss SMEs the range up to 40 is typical; the maximum is reached at 35.5.74%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Sonnbau AG reaches a ranQ Trust Score of 3.9 out of 5.0 — rated «High». The rating draws, among other things, on 4.8 out of 5 stars from 4 customer reviews. The data basis is 96%, so the score is backed by part of the criteria. As of October 2026.

The Trust Score cannot be bought and is calculated from publicly verifiable data.

Reviews

Aggregated rating

Aggregated rating
4.8
of 5

Aggregated from 4 reviews across all connected sources

Sources
GGoogle4.84
★TrustpilotSoon
PProvenExpertSoon

Further sources are added continuously and factored into the ranQ Rating.

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Location

Saluferstrasse 7
7000 Chur

At a glance

Legal form
Corporation
UID
CHE-374.790.129
Founded
2016 · 10 years
Last commercial register change
March 16, 2016
Employees
1 to 10
Legal form: Graded by liability and disclosure. The weight is kept small: a sole proprietorship is not a dubious company, it is just liable differently.
100.0
6%
  • Branch offices: Branch offices linked in the commercial register. Having none is normal and costs no points.70.03%
    • Full methodology

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