What KOSTAL Solar Electric does

KOSTAL Solar Electric GmbH is a German manufacturer of photovoltaic power electronics, headquartered in Freiburg im Breisgau with development and production in Hagen, North Rhine-Westphalia. It operates as a wholly-owned subsidiary of the diversified KOSTAL Group (a family-owned German industrial conglomerate with over a century of engineering heritage and approximately 7,000 employees globally). The company designs and produces solar inverters (PLENTICORE family spanning 4-20 kW universal/solar/hybrid/battery configurations, PIKO CI commercial inverters up to 100 kW, and AC-coupled PLENTICORE BI battery inverters for retrofit), EV charging stations (ENECTOR and ENECTOR G2 wallboxes), and high-voltage battery storage (HELIVOR HV), alongside accessories such as the BackUp Switch and KSEM Smart Energy Meter and software tools (Solar Portal, Solar 4me App, Solar Terminal, Solar Calculator, Solar Plan). Its technical differentiation rests on DC-coupled high-voltage architecture, scalable power classes, Multi Device Control orchestration of up to three inverters, self-learning shadow management, and independent HTW Berlin-validated System Performance Index efficiency.

The business model is hardware-led and multi-channel. Revenue streams include inverter sales (PLENTICORE, PIKO CI), wallbox sales (ENECTOR), battery systems (HELIVOR and compatible third-party brands such as BYD, VARTA, Pylontech), accessories, optional paid warranty extensions (from 5 to 10 years), and battery activation codes sold post-installation via the webshop. Distribution combines a certified Fachpartner installer network, electrical wholesale distributors, and a direct-to-consumer webshop (shop.kostal-solar-electric.com) across ten European markets (Germany, Austria, Switzerland, France, Italy, Spain, Poland, Netherlands, Sweden, Greece), supported by partner and installer portals and a 9-language web presence. The company sells to two primary customer segments — residential homeowners seeking PV with storage, EV charging, backup power and dynamic-tariff optimization, and commercial/industrial customers requiring larger installations (PIKO CI 30/50/100) and scalable storage — plus a secondary retrofit/repowering segment addressing owners of existing PV systems.

KOSTAL is privately held, reports no external funding or private equity involvement, and operates as an internally funded division of KOSTAL Group. Recent corporate activity has been concentrated on product innovation rather than M&A: between 2025 and mid-2026 KOSTAL launched the PLENTICORE G3 platform, the PIKO CI 100 commercial inverter, the PLENTICORE BI 25 retrofit battery inverter, the BackUp Switch, the ENECTOR G2 wallbox, the HELIVOR HV battery, and the Multi Device Control feature, and showcased the portfolio at Intersolar Europe 2026. The company has accumulated multiple independent awards (HTW Berlin Testsieger 2026, EUPD Inverter Award 2025, German Innovation Award, Red Dot, German Design Award) reinforcing its "Made in Germany" positioning.

Name

KOSTAL Solar Electric

Legal name

KOSTAL Solar Electric GmbH

Website

https://kostal-solar-electric.com

Company type

Private

Operating status

Operating

Headcount range

5,001–10,000 employees

Short description

KOSTAL Solar Electric GmbH is a German manufacturer of photovoltaic power electronics — solar/hybrid/battery inverters (PLENTICORE, PIKO CI), EV wallboxes (ENECTOR), and high-voltage batteries (HELIVOR) — serving residential and commercial PV customers across ten European countries via certified installers, wholesalers, and its own webshop.

Ownership category

akta.pro rank

Product category

Solar Inverters and Photovoltaic Power Electronics

NAICS

Power, Distribution, and Specialty Transformer Manufacturing (335311), Relay and Industrial Control Manufacturing (335314)

SIC

Electronic & Other Electrical Equipment (No Computer Equip) (3600), Electronic Coils, Transformers & Other Inductors (3677)

akta.pro primary industry

Solar Inverters, Power Optimizers & MLPE Manufacturing (EUAMAHAB)

akta.pro secondary industries

Solar Inverters, Power Electronics & MLPE (String/Central Inverters, Optimizers, Microinverters) (EUAMABAE), Power Electronics for Renewable & Grid-Tied Applications (Solar inverters, wind converters, grid-tie interfaces) (IMAGADAJ), Renewable Distributed Generation (Rooftop/Onsite Solar, Small Wind, Small Hydro) (EUACALAJ)

Keywords

• Solar inverters
• Photovoltaic power electronics
• Battery storage systems
• EV charging stations
• Energy management systems

Headquarters

HQ city

Freiburg Im Breisgau

HQ country

Germany

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Inverter Sales: KOSTAL generates revenue primarily through the sale of solar inverters including the PLENTICORE (residential/commercial), PLENTICORE plus, PLENTICORE MP, and PIKO CI (commercial) product lines. These are sold through installers, wholesalers, and direct-to-consumer via webshop.
2. Wallbox Sales: Sale of ENECTOR and ENECTOR G2 smart EV charging stations for residential and commercial use, integrated with KOSTAL's energy management ecosystem.
3. Battery Storage Systems: Sale of HELIVOR high-voltage battery storage systems and compatible third-party batteries (BYD, VARTA, Pylontech) through the KOSTAL ecosystem.
4. Accessories and Components: Sale of accessories including BackUp Switch, Smart Energy Meter, DC surge protection, and other peripheral components for complete PV system integration.
5. Warranty Extensions: Optional paid warranty extensions beyond the standard 5-year warranty, extending coverage to 10 years for registered users.
6. Activation Codes: Battery function can be activated post-installation through purchase of activation codes in the KOSTAL Solar Webshop, allowing deferred payment for battery features.

Pricing tiers

Go-to-market motion3 records

Distribution channels4 records

Marketing channels7 records

Core offering

KOSTAL Solar Electric designs, develops, and manufactures photovoltaic power electronics including the PLENTICORE family of solar, hybrid, and battery inverters (4-20 kW), the PIKO CI commercial project inverter line (30-100 kW), the ENECTOR smart EV wallbox, and the HELIVOR high-voltage modular battery storage system. The company sells these products together with accessories such as the BackUp Switch and Smart Energy Meter, supported by the Solar Portal and Solar 4me App monitoring tools, to residential and commercial customers across European markets via certified installers, electrical wholesale, and its own webshop.

Product overview

KOSTAL Solar Electric is a German manufacturer of photovoltaic power electronics offering a comprehensive product ecosystem. The core product line centers on the PLENTICORE inverter family (available as MP single-phase, plus three-phase, and G3 universal versions) that function as solar, hybrid, or battery inverters with scalable 4-20 kW power ranges. The product portfolio extends to the PIKO CI 100 commercial inverter (100 kW) for large installations, the ENECTOR and ENECTOR G2 wallboxes for EV charging, and the HELIVOR HV high-voltage battery storage system. Supporting tools include the Solar Portal and Solar 4me App for monitoring, Solar Calculator and Solar Plan for planning, and accessories like the BackUp Switch for backup power. Advanced features include Multi Device Control (MDC) for managing multiple inverters, Remote Access for installers, and intelligent shadow management with self-learning MPP tracking. All products are developed and manufactured in Germany (Hagen, NRW) with 5-year warranty (extendable to 10 years).

Differentiator

Problem solved

Functional benefit

Brands

• PLENTICORE: Universal inverter series for PV systems, available as solar, hybrid, or battery inverter. Currently in third generation (G3) with power range 4-20 kW.
• ENECTOR
• HELIVOR
• PIKO CI
• PLENTICOIN
• Solar4me

Products and services

• PLENTICORE G3 Universal Inverter Third-generation universal inverter covering 4-20 kW (S: 4-7 kW, M: 8.5-12.5 kW, L: 15-20 kW) that functions as solar, hybrid, or battery inverter, with scalable power up to two performance stages per size class, integrated backup power capability when paired with the BackUp Switch and battery storage, and 2 LAN ports, 4 digital switching outputs, integrated WLAN, Modbus TCP, and SG Ready interfaces. Targets residential and commercial PV installations through certified installers.
• PLENTICORE MP Single-Phase Inverter Single-phase inverter for smart energy production, storage, and usage with backup function, featuring up to 3 MPP trackers and integrated shadow management. Designed for residential PV installations on single-phase networks.
• PLENTICORE plus Three-Phase Hybrid Inverter Three-phase hybrid inverter with multiple MPPT inputs and award-winning efficiency for smart energy production, storage, and usage in residential and small commercial PV installations.
• PLENTICORE BI Battery Inverter Pure battery inverter that integrates battery storage with existing PV systems on the AC side in parallel with the existing PV inverter, controlled by the KOSTAL Smart Energy Meter. Designed for retrofitting storage to legacy PV systems without replacing the existing solar inverter.
• PLENTICORE BI 25 High-Power Battery Inverter High-power battery inverter solution for large storage applications with high charge/discharge power for rapid peak demand coverage and optimized self-consumption in commercial settings. Designed for projects requiring high computational power and flexible system architectures.
• PIKO CI 100 Commercial Project Inverter 100 kW commercial project inverter for large commercial PV installations and projects with over 98% maximum efficiency, DC oversizing up to 50%, maximum system voltage up to 1100V, integrated Wi-Fi, Bluetooth, RS-485, arc fault detection, IP66 certification, and compatibility with power plant controllers.
• KOSTAL Wallbox ENECTOR EV Charger Smart EV charging station with intelligent load management, Time Mode for automatic charging during low electricity price periods, and full integration with the KOSTAL energy system for 100% solar self-consumption charging when paired with a compatible KOSTAL inverter and storage system. Award-winning design recognized with the German Innovation Award, Green GOOD DESIGN Award, and Haustec Award.
• KOSTAL Wallbox ENECTOR G2 Second-generation ENECTOR wallbox for home EV charging with improved performance, efficiency, and comfort features, maintaining full integration with the KOSTAL inverter and storage ecosystem for solar-optimized charging.
• KOSTAL HELIVOR HV High-Voltage Battery Storage Flexible modular high-voltage battery storage system designed for the KOSTAL PLENTICORE inverter family, offering maximum flexibility backed by KOSTAL service and warranty for residential and commercial storage applications.
• KOSTAL BackUp Switch Manual Transfer Switch Manual transfer switch that enables backup power operation for PV systems using PLENTICORE G3 inverters with battery storage, available in three-phase (up to 63A) and single-phase (MP) variants. Disconnects the home from the public grid during outages and allows the PLENTICORE to supply solar and battery power across all phases.
• KOSTAL Smart Energy Meter Intelligent energy meter for measuring household energy consumption, working with the KOSTAL Smart Software to automatically charge the battery storage with surplus solar energy and enabling intelligent load management across the PLENTICORE inverter system.
• PLENTICOIN Service Program Digital service token system for KOSTAL service and support, functioning as the company's service and loyalty program for customers, used for purchasing service-related items and activation codes in the KOSTAL Solar Webshop.
• KOSTAL Battery Activation Code One-time activation code purchased from the KOSTAL Solar Webshop that unlocks the battery function of a PLENTICORE hybrid inverter post-installation, enabling customers to defer payment for battery functionality until the battery is added.
• KOSTAL Warranty Extension (5 to 10 Years) Paid extension of the standard KOSTAL inverter warranty from 5 years (included free upon registration in the KOSTAL Solar Portal) to 10 years, covering material defects beyond the standard warranty period.

Quantifiable outcome

• System A with 95% SPI vs System B with 89% SPI yields >300 kWh/year additional usable energy, representing approximately 111 EUR annual savings at current electricity prices, or ~1,665 EUR over 15 years
• +2 more outcomes

Segments3 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

AI capability3 records

Feature10 records

Partnerships

Five partnerships are on record, tiered core.

• BYDcoreTechnology or IntegrationBYD is one of the compatible battery manufacturers for KOSTAL PLENTICORE inverters. The combination of PLENTICORE with BYD batteries has achieved top rankings in HTW Berlin storage tests.
• VARTAcoreTechnology or IntegrationVARTA is listed as one of the compatible high-voltage battery manufacturers for KOSTAL PLENTICORE inverters, offering flexible storage solutions for residential and commercial applications.
• PylontechcoreTechnology or IntegrationPylontech is mentioned as a compatible battery storage manufacturer for KOSTAL inverters, enabling broad ecosystem compatibility for customers.
• HTW BerlincoreStrategic or Co-development PartnerHTW Berlin conducts independent storage system testing (System Performance Index/SPI) and KOSTAL has consistently achieved top rankings since 2018, demonstrating the company's high efficiency standards through third-party verification.
• Smart Energy Meter (KSEM)coreTechnology or IntegrationKOSTAL Smart Energy Meter is part of the integrated ecosystem, working with PLENTICORE inverters for intelligent energy management and consumption monitoring.

Scale indicators5 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• SMA Solar Technology AG: Germany's largest solar inverter manufacturer and KOSTAL's most direct domestic competitor. Both companies serve European residential and commercial PV markets with Made-in-Germany positioning, hybrid inverter portfolios, and battery storage integration. SMA's broader product range and public listing make it the primary benchmark for KOSTAL's market position.
• SolarEdge Technologies: Israeli inverter and power optimizer specialist with strong European residential and commercial presence. Competes with KOSTAL on inverter efficiency, monitoring software, and now battery storage (Energy Bank), making it a closely comparable technology peer.
• Sungrow Power Supply Co., Ltd. One of the world's largest solar inverter manufacturers with extensive European presence. Competes across residential, commercial, and utility-scale segments, offering string and central inverters with integrated storage and EV charging solutions — directly overlapping with KOSTAL's addressable market.
• Ginlong Technologies / Solis: Chinese string inverter manufacturer (Solis brand) with established European distribution network. Targets the same residential and commercial installer channels as KOSTAL, often competing on price-efficiency trade-offs in similar power classes.
• Growatt New Energy: Global inverter and storage manufacturer with strong residential and commercial presence in Europe. Competes with KOSTAL on hybrid inverters, battery storage integration, and increasingly on EV charging products.
• Huawei Digital Power: Global solar inverter leader with strong European expansion, offering residential and commercial string inverters with smart energy management and storage integration. Represents the primary scale and price-competition threat to KOSTAL in Europe.
• GoodWe: Chinese inverter manufacturer expanding aggressively in European residential and commercial PV markets. Offers hybrid inverters, battery storage, and EV chargers at competitive price points, directly competing with KOSTAL across the integrated solar-storage-EV stack.
• Enphase Energy: US-based microinverter leader with growing European residential footprint and IQ Battery storage product. Enphase's distributed architecture and energy management software compete with KOSTAL's PLENTICORE string inverter + storage ecosystem for the same residential customers.
• Fronius International GmbH: Austrian family-owned inverter manufacturer with comparable portfolio across residential and commercial solar inverters, battery storage, and EV charging. Direct overlap with KOSTAL in DACH and broader European markets, with similar premium positioning and installer-driven channel strategy.

Broad incumbents

• FIMER SpA: Italian inverter manufacturer (formerly ABB solar) serving residential, commercial, and utility-scale markets. Provides direct competition to KOSTAL's PIKO CI commercial inverter range and represents a comparable European incumbent with broader legacy utility exposure.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/kostal-solar-electric-international

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

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 KOSTAL Solar Electric