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

About the company

The core activity of Opti Sun Sàrl is the planning, installation and maintenance of photovoltaic systems, as well as consulting and supporting customers in the implementation of solar energy projects. The company offers specialized services such as sizing and installing customized solar energy systems, optimizing energy efficiency and maximizing return on investment. Additionally, it also provides training and consulting services for companies and individuals to support them in the implementation of solar energy projects.

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Offering

Products & services

Industry:Solar & Photovoltaics
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3.6/5

Opti Sun Sàrl

✓ Offered6
Feasibility studies & PV AMO
Technical, economic and profitability feasibility studies; analysis of solar potential and site constraints; drafting of specifications and management of tendering processes.
Engineering consultancy & design office
Sizing and design of photovoltaic installations, administrative procedures, project management (maîtrise d’œuvre), technical supervision, operation of the installations and maintenance plans.
Self-consumption studies & optimisation
Analysis of individual or collective self-consumption models, sizing of storage systems, profitability simulations and economic studies.
Specialist advice
Advice on photovoltaic insurance, investment selection, photovoltaic contracting, as well as the purchase and sale of energy.
Training & support
Coaching and training for teams, awareness-raising for the energy transition, support for setting up a company or a solar division, strategic support.
Complementary services
Photovoltaic installation, batteries with or without backup, charging points, renovation and compliance upgrades of installations, CECB and CECB+ energy audits.
Trust & reputation

ranQ Trust Score of Opti Sun Sàrl: 3.6 out of 5.0

Trust Score3.6/ 5.0

Solid

x

Data basis 96% · As of October 2026

Opti Sun Sàrl scores 56.5 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.68.224%
  • 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.17.610%
  • 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.70.08%
Opti Sun Sàrl scores 57.1 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.39.612%
  • 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%
Opti Sun Sàrl 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%
Opti Sun Sàrl scores 0.0 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 35.0.04%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Opti Sun Sàrl reaches a ranQ Trust Score of 3.6 out of 5.0 — rated «Solid». The rating draws, among other things, on 5.0 out of 5 stars from 1 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 1 reviews across all connected sources

Sources
GGoogle51
★TrustpilotSoon
PProvenExpertSoon

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

Knowledge

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Location

Route de Divonne 18
1260 Nyon
Opening hours
Mon
07:30 - 12:00, 13:30 - 18:00
Tue
07:30 - 12:00, 13:30 - 18:00
Wed
07:30 - 12:00, 13:30 - 18:00
Thu
07:30 - 12:00, 13:30 - 18:00
Fri
07:30 - 12:00, 13:30 - 18:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Limited Liability Company
UID
CHE-184.051.854
Founded
2024 · 2 years
Last commercial register change
April 5, 2024
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.
88.0
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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