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

About the company

esfera Solar AG is a company that designs, installs and services photovoltaic systems. Its offerings include consulting and planning, project coordination and subsidy support, installation and commissioning, maintenance, battery storage, monitoring, backup power and electric vehicle charging stations.

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Offering

Products & services

Industry:Solar & Photovoltaics
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esfera Solar AG

✓ Offered12
Photovoltaic systems
Tailor-made photovoltaic solutions for private clients, owner associations, commercial businesses, agriculture and contracting partners; including roof-mounted, roof-integrated, facade, balcony and off-grid island systems.
Consulting & planning
Free initial consultation, non-binding preliminary estimate, roof survey with drone images, project dossier including cost and profitability calculation.
Installation & commissioning
Supply of solar modules, DC and AC installation, assembly by our own teams, configuration, test run, handover with system dossier and a monitoring app.
Coordination & funding
Project coordination from planning to implementation, assignment of a project manager, registration and submission of the Pronovo one-off payment, and support with further funding applications.
Maintenance & support
Regular inspections, string measurements, documentation, remote monitoring, software updates, as well as BASIC, STANDARD and PREMIUM maintenance packages.
Energy storage
Battery storage to use solar power in the evening, at night or during bad weather; modular and upgradeable, designed to optimise self-consumption.
Emergency power
Emergency power package with automatic switching in the event of a grid outage, load management and supply of selected consumers such as lighting, a refrigerator or an internet router.
Monitoring
Digital monitoring for real-time tracking of production, consumption and feed-in; including alarm functions, reporting, export and setup at handover.
EV charging station
Planning, delivery and installation of wallboxes for e-mobility; optionally smart integration with the PV system and energy storage for charging using solar power.
Roof-mounted systems
Photovoltaic systems on existing pitched and flat roofs; cost-effective, quick to install and suitable for residential buildings, commercial businesses and agriculture.
Roof-integrated systems
Photovoltaic systems integrated into the roof that replace the roof covering; suitable for new builds and roof renovations with a focus on function and design.
Facade systems
Vertical photovoltaic systems on facades for additional power generation; a sensible option when roof area is limited and for combining energy generation with design.
Trust & reputation

ranQ Trust Score of esfera Solar AG: 4.2 out of 5.0

Trust Score4.2/ 5.0

Very high

x

Data basis 96% · As of October 2026

esfera Solar AG scores 86.5 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.83.124%
  • 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.83.810%
  • 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.100.08%
esfera Solar AG scores 63.4 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.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.70.07%
esfera Solar 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%
esfera Solar AG scores 51.4 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 35.51.44%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

esfera Solar AG reaches a ranQ Trust Score of 4.2 out of 5.0 — rated «Very high». The rating draws, among other things, on 4.8 out of 5 stars from 26 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 26 reviews across all connected sources

Sources
GGoogle4.826
★TrustpilotSoon
PProvenExpertSoon

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

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Location

Altelsweg 9
3661 Uetendorf
Opening hours
Mon
08:00 - 12:00, 13:00 - 17:00
Tue
08:00 - 12:00, 13:00 - 17:00
Wed
08:00 - 12:00, 13:00 - 17:00
Thu
08:00 - 12:00, 13:00 - 17:00
Fri
08:00 - 12:00, 13:00 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-223.276.465
Founded
2024 · 2 years
Last commercial register change
April 15, 2024
Employees
11 to 20
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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