Solidsun

What Solidsun does

SolidSun is a Czech Republic-based turnkey photovoltaic (FVE) installer operating as a wholly-owned subsidiary of Pražská energetika (PRE), the Prague-headquartered energy group majority-owned by the City of Prague with EnBW as strategic investor. Founded around 2007–2008, the company designs, installs, and services solar power systems for three customer segments: single-family homes (primary), multi-family buildings (SVJ) with shared FVE configurations, and commercial/industrial enterprises, having completed more than 19,000 installations as of August 2025. Its technology stack centers on Huasun HJT (Heterojunction) panels, Huawei FusionSolar inverters and battery storage, and the proprietary SunBerry/ELI smart energy management module that enables predictive energy trading at spot prices and remote diagnostics resolving up to 70% of service requests without technician visits. The product portfolio also includes heat pumps, air conditioning, EV wallboxes, and a 24/7 in-house monitoring center (Dohledové centrum), with a client portal (Klientská zóna) for post-sale engagement.

The business model is primarily one-time hardware-plus-installation revenue per FVE system, priced in CZK and heavily influenced by the Czech NZÚ (Nová zelená úsporám) government subsidy program, with entry-level systems from 20,000 CZK post-subsidy and premium Huawei bundles promoted with 85,000 CZK discounts. Complementary revenue streams include service and maintenance contracts (mandatory periodic inspections per ČSN standards), subsidy management fees (embedded in the installation contract), and energy surplus purchase via the Solidní Energie brand, which buys back excess generation at spot market prices. Distribution is direct and field-sales-led, with sales representatives conducting on-site roof assessments, supported by an online configurator, phone/web inside sales, and the cross-sell infrastructure of PRE's 830,000+ customer accounts. In July 2025, SolidSun merged with sister PRE subsidiary Solarinvest – GREEN ENERGY to form PREsolidsun, creating the largest comprehensive energy solutions provider in the Czech Republic. FY2022 group revenue was 1.185 billion CZK (up 58% YoY) with 86.2 million CZK net profit (up 233%), positioning the merged entity as a top-tier player in a market where many smaller competitors have exited.

Name

Solidsun

Legal name

PREsolidsun, s.r.o.

Website

https://solidsun.cz

Company type

Private

Founded year

2008

Operating status

Operating

Headcount range

51–100 employees

Short description

SolidSun is a Czech turnkey photovoltaic installer and wholly-owned subsidiary of PRE Group, designing, installing, and servicing solar systems, heat pumps, and EV wallboxes for residential, multi-family, and commercial customers across the Czech Republic.

Ownership category

akta.pro rank

Product category

Solar Energy Installation Services

NAICS

Automatic Environmental Control Manufacturing for Residential, Commercial, and Appliance Use (334512)

SIC

Electronic & Other Electrical Equipment (No Computer Equip) (3600)

akta.pro primary industry

Home Energy & EV Charging (HEMS, Smart Meters, Batteries, Chargers) (HSAPAQAF)

akta.pro secondary industries

Solar Balance-of-System Components (Cables, Combiner Boxes, Switchgear, Transformers) (EUAMABAG), Solar Roofing & Roof-Mounted PV Systems (IMADAFAO), Residential / Behind-the-Meter Storage Installation & Integration (EUAEAEAC)

Keywords

• Photovoltaic system installation
• Solar energy services
• Residential solar solutions
• Heat pump installation
• Energy management systems

Headquarters

HQ city

Frydek-mistek

HQ country

Czechia

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

Supply Chain, Personnel, Operations, Marketing or Sales, Technology or R&D, Infrastructure

Revenue model

1. FVE System Sales (Equipment + Installation): One-time revenue from sale and installation of photovoltaic systems, including panels, inverters, batteries, mounting hardware, and wiring. Covers residential, multi-family, and commercial segments. Pricing varies by system size, component tier (e.g., standard vs. HJT panels), and battery capacity. Includes full project management: design, permits, grid connection, and subsidy administration. DPH of 12% applies to materials and installation labor.
2. Complementary Energy Systems (Heat Pumps, Air Conditioning, Wallboxes): Sale and installation of complementary energy technologies: heat pumps, air conditioning units, and EV wallboxes. Often bundled with FVE installations as part of comprehensive home energy solutions. These extensions increase average order value and cross-sell recurring service opportunities.
3. Service, Maintenance & Revisions: Ongoing revenue from after-sale services including remote monitoring diagnostics, periodic inspections/revisions (required every 2 years per Technical Inspection of Czech Republic or every 4 years per ČSN 33 1500), repairs, and spare parts. The company's monitoring center enables remote fault resolution for many issues. Service is also offered to customers whose original installers have ceased operations.
4. Energy Surplus Purchase (Výkup přebytků): Through Solidní Energie (solidunenergie.cz), the company purchases surplus electricity from installed FVE systems at spot market prices. Revenue from this stream accrues to customers; the company's benefit is customer retention and ecosystem lock-in.
5. Subsidy Management (Dotační management): The company manages the full subsidy application process (primarily NZÚ — Nová zelená úsporám) on behalf of customers, including preparation, submission, and final claim. This service is embedded in the installation contract and guaranteed contractually.

Pricing tiers

Go-to-market motion2 records

Distribution channels6 records

Marketing channels10 records

Core offering

SolidSun designs, sells, installs, and services turnkey photovoltaic (solar electric) systems for residential homes, multi-family buildings, and commercial/industrial customers in the Czech Republic. Offerings include HJT and conventional solar panels, Huawei FusionSolar hybrid inverters and battery storage, the proprietary SunBerry/ELI smart energy management module, EV wallboxes, heat pumps, and air conditioning units, with full end-to-end service covering design, permitting, grid connection, subsidy administration, 24/7 monitoring, and ongoing maintenance.

Product overview

SolidSun (now operating as part of PREsolidsun following the July 2025 merger with Solarinvest) is a turnkey provider of residential, multi-dwelling, and commercial photovoltaic (PV) solar electric systems throughout the Czech Republic. Its core offering is custom-designed photovoltaic installations built around Huasun HJT solar panels and Huawei FusionSolar inverters/batteries, complemented by add-on modules including smart energy management (ELI), the SunBerry smart control unit, wallbox EV chargers, heat pumps, and air conditioning systems. The company delivers a comprehensive end-to-end service covering system design, installation, subsidy management under the NZÚ program, ongoing maintenance through a 24/7 monitoring center and remote diagnostics capability, energy surplus purchasing at spot prices, and a client portal for real-time performance tracking. The product portfolio also includes a podcast series (Na Voltech) and an online FVE configurator tool.

Differentiator

Problem solved

Functional benefit

Brands

• SunBerry: Smart control module connecting photovoltaic power plants with monitoring service center and electricity procurement control center. Enables remote diagnosis and resolution of up to 70% of FVE requests without technician visit.
• Solidní energie

Products and services

• Photovoltaic (FVE) Solar Electric Systems Custom-designed turnkey photovoltaic (PV) solar electric systems for residential, multi-dwelling, and commercial properties, including design, installation, permits, grid connection, and subsidy administration under the NZÚ program.
• Huasun HJT Solar Panels High-efficiency heterojunction (HJT) solar panels featuring an amorphous silicon layer on monocrystalline silicon cells, delivering 460W front-side output, 21.16% efficiency, 90% power retention after 25 years, and superior diffuse-light performance.
• Huawei FusionSolar Inverters and Battery Storage Huawei FusionSolar hybrid inverters and scalable LUNA battery storage systems (from 10 kWh) bundled as the premium technology offering across SolidSun's solar installations, with smart energy management integration.
• Wallbox EV Charging Stations Electric vehicle wallbox charging stations offered as a complementary product to photovoltaic systems, communicating with solar installations to optimize EV charging using surplus solar energy.
• Heat Pump Systems Heat pump systems sold and installed as a complement to photovoltaic installations, enabling efficient year-round heating and qualifying for NZÚ government subsidies.
• Air Conditioning Systems Modern air conditioning units sold and installed as a complement to solar installations, providing summer cooling and low-energy winter heating, available at a 20,000 CZK promotional discount.
• FVE Subsidy Management Service (NZÚ) Full-service subsidy application and administration for photovoltaic installations under the Czech NZÚ (New Green Savings) program, contractually guaranteed; covers preparation, submission, and final claim.
• Maintenance, Service, and Repair Ongoing after-sale service including remote diagnostics resolving up to 70% of issues without a technician visit, periodic inspections per Czech ČSN standards, repairs, and spare parts; also offered to customers whose original installers have exited the market.
• 24/7 Monitoring Center (Dohledové centrum) Proprietary in-house 24/7 monitoring center that continuously tracks performance of every installed power plant, detecting anomalies and triggering remote or on-site service interventions with minimal delay.
• Energy Surplus Purchase (Výkup přebytků) Service through Solidní Energie that purchases surplus electricity generated by SolidSun-installed FVE systems at spot market prices, enabling customers to monetize excess generation; includes second EAN and OTE market registration.
• Client Portal (Klientská zóna) Self-service online portal (muj.solidsun.cz) where customers can monitor real-time power output, energy savings, and energy flow statistics, schedule service, review history, and manage subsidy and energy selling documentation.

Quantifiable outcome

• Up to 65% reduction in electricity bills
• +6 more outcomes

Named customers6 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

Seven partnerships are on record, tiered core and minor.

• Solarinvest — GREEN ENERGY, s.r.o.coreStrategic or Co-development Partner · 1 July 2025On July 1, 2025, SolidSun and Solarinvest — both PRE Group subsidiaries — merged into a single entity operating as PREsolidsun. The merger combined two major Czech photovoltaic installers, creating the largest provider of comprehensive energy solutions in the Czech Republic with nationwide coverage.
• Solidní Energie (Yello / eYello CZ)coreTechnology or Integration · 1 January 2025Solidní Energie, operating under the Yello brand within the PRE Group ecosystem, provides energy trading services — specifically purchasing surplus electricity from SolidSun-installed FVE systems at spot market prices. This enables customers to monetize excess generation and creates an integrated energy ecosystem.
• HuasuncoreTechnology or Integration · 1 January 2024SolidSun partnered with Huasun to offer HJT (Heterojunction) solar panels — among the highest-efficiency panels available globally. The partnership gives SolidSun exclusivity as one of the first Czech distributors of Huasun HJT technology. HJT panels offer 21.16% efficiency, 88% power retention after 30 years, and superior diffuse-light performance.
• PREdistribuce, a.s.minorOthers · 1 January 2024PREdistribuce is the electricity distribution system operator in Prague and Roztoky, and a fellow PRE Group company. As a related-party entity, it is part of the broader ecosystem within which SolidSun operates.
• REMA.cloudminorOthers · 1 January 2024SolidSun partners with REMA.cloud for take-back and recycling of end-of-life electrical equipment and batteries, fulfilling WEEE compliance obligations and supporting sustainability commitments.
• Huawei (FusionSolar)coreTechnology or Integration · 1 January 2023SolidSun offers Huawei FusionSolar inverter and battery systems as its premium technology bundle. Huawei FusionSolar products feature smart energy management, high-efficiency inverters, and scalable battery storage from 10 kWh. SolidSun promotes these with significant discounts (85,000 CZK promotional offer).
• ELEKTRO-FA.PAVELEKminorChannel Partner/ Reseller/ Distributor · 1 January 2023Partnership with ELEKTRO-FA.PAVELEK referenced in press releases. Nature of cooperation involves installation and service delivery, potentially as a regional installer or subcontractor.

Scale indicators10 records

Recent moves7 records

Expansion highlights6 records

Direct peers

• Otovo ASA: Otovo is a Norwegian-listed residential solar installer operating across multiple European markets with a tech-enabled, subscription-and-outright-purchase model. Its integrated software platform, multi-country footprint, and residential focus make it a structurally similar operator to SolidSun at greater scale.
• Enpal GmbH: Enpal is a leading German residential solar leasing company offering solar, batteries, EV chargers, and heat pumps on a subscription basis. Its integrated home energy product and tech-enabled customer experience are highly comparable to SolidSun's full-service approach, though Enpal operates a leasing model rather than outright sales.
• 1Komma5° GmbH: 1Komma5° is a fast-scaling German residential solar installer offering an integrated home energy solution (solar, heat pumps, EV charging, dynamic tariffs) with proprietary software. Its business model — combining premium hardware, in-house energy management, and a multi-product offering — closely mirrors SolidSun's strategy, making it a relevant European comparable.
• Solarwatt GmbH: Solarwatt is a German manufacturer and installer of premium residential solar systems, including glass-glass PV modules and battery storage with energy management. It is comparable to SolidSun as a vertically integrated residential PV provider with proprietary technology and a focus on quality/premium positioning.
• Photon Energy N.V. Photon Energy is a Czech-founded solar IPP and installer with operations across multiple European markets and Australia. It overlaps with SolidSun in residential, commercial, and C&I PV installations in the Czech Republic, and is the most established independent Czech solar peer with international scope.
• Solarinvest - GREEN ENERGY, s.r.o. Solarinvest was SolidSun's most direct Czech competitor and fellow PRE Group subsidiary; the two merged into PREsolidsun in July 2025. They operated the same residential and commercial PV installation model with overlapping customer segments across the Czech Republic, making them the closest one-to-one comparable prior to the merger.

Others

• Fronius International GmbH: Fronius is an Austrian manufacturer of solar inverters, battery storage, and welding equipment. While not a direct competitor in installation, Fronius operates in the same residential solar value chain as a tier-1 inverter supplier and is a key comparable for the technology stack SolidSun's ELI/SunBerry system integrates with.
• Enphase Energy, Inc. Enphase is a US-listed global supplier of microinverters, batteries, and energy management software for residential solar. It competes indirectly with the Huawei inverter/SunBerry control stack that SolidSun uses and represents a benchmark for software-defined residential solar energy management.

Broad incumbents

• E.ON Česká republika: E.ON Česká republika is the Czech arm of European utility major E.ON, offering residential solar and energy solutions through its customer base. It is a broader incumbent competing with SolidSun's installer-led model via utility-scale customer relationships and integrated energy offerings.
• ČEZ Group (ČEZ ESCO / ČEZ Solární): ČEZ is the largest Czech energy group and operates solar installation and energy services businesses via ČEZ ESCO and ČEZ Solární. It competes with SolidSun in residential and commercial PV across the Czech Republic with the advantages of a much larger balance sheet, broader energy portfolio, and incumbent utility scale.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks7 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/channel/UCaIYRemT_4Lmqe3ua_QUlJg
• Facebookfacebook.com/solidsunsro
• LinkedInlinkedin.com/company/solidsun
• Instagraminstagram.com/solidsun.cz

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Subsidiaries1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Solidsun