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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryEnergy & EnvironmentSolar & PhotovoltaicsBlonayBTsun SA
BTsun SA Logo
Verified· 3 sourcesTrust Score
Summary

About the company

BTsun SA is a general contractor for renewable energy that provides turnkey solutions including photovoltaics, solar thermal systems, heat pumps, battery storage and electric vehicle charging stations. The company handles design, installation, coordination of trades, administrative procedures and subsidy applications, and also provides energy renovation, roof insulation and peer-to-peer energy sharing solutions.

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Offering

Products & services

Industry:Solar & Photovoltaics
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3.9/5

BTsun SA

✓ Offered7
Photovoltaic engineering office
Photovoltaic consulting, profitability and feasibility studies, partial or full project management, performance monitoring, maintenance contracts and project financing.
Photovoltaic roof tiles
Photovoltaic roof tiles Cerasolpan, Freesuns, Sunstyle, FIT52/PAN29 and Solrif by Schweizer for renovations and new builds, with aesthetic integration on the roof.
Photovoltaic modules
Photovoltaic modules selected for performance, aesthetics, warranty and innovation, with brands such as Aleo, LG, Solarwatt, Suntech or Trina Solar.
Inverters and storage
String inverters, optimisers, microinverters, battery storage systems and smart solutions to optimise energy consumption for photovoltaic installations.
Mounting system
Mounting solutions for pitched roofs, flat roofs, carports, glazed roofs, solar canopies, façades and ground-mounted structures, with advice tailored to the project.
EV charging stations
EV charging stations, advice, planning, commissioning and management systems, with private, public and network solutions.
Blackout and energy self-sufficiency solutions
Backup and energy self-sufficiency solutions with local supply, multi-energy sovereignty and securing of the electricity supply for buildings and activities.
Trust & reputation

ranQ Trust Score of BTsun SA: 3.9 out of 5.0

Trust Score3.9/ 5.0

High

x

Data basis 96% · As of October 2026

BTsun SA scores 53.8 out of 100 points in the Reputation area of the ranQ Trust Score. This area carries 42% of the weighting.
x
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.70.824%
  • 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.27.910%
  • 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%
BTsun SA scores 81.4 out of 100 points in the Substance area of the ranQ Trust Score. This area carries 28% of the weighting.
x
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%
BTsun SA scores 85.0 out of 100 points in the Identity area of the ranQ Trust Score. This area carries 22% of the weighting.
x
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%
BTsun SA scores 7.7 out of 100 points in the Visibility area of the ranQ Trust Score. This area carries 8% of the weighting.
x
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 35.7.74%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

BTsun SA reaches a ranQ Trust Score of 3.9 out of 5.0 — rated «High». The rating draws, among other things, on 5.0 out of 5 stars from 2 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
5
of 5

Aggregated from 2 reviews across all connected sources

Sources
GGoogle52
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Chemin de Bahyse 8 B
1807 Blonay
Opening hours
Mon
08:30 - 17:30
Tue
08:30 - 17:30
Wed
08:30 - 17:30
Thu
08:30 - 17:30
Fri
08:30 - 17:30
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-158.815.540
Founded
2016 · 10 years
Last commercial register change
April 11, 2022
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.85.03%
    • Full methodology

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