What PlexLog does

PLEXLOG GmbH is a German specialist in PV monitoring and energy data management, headquartered in Osnabrück, Lower Saxony, and operating since 2015. The company designs and manufactures a range of hardware energy managers (PL40, PL100, PL500+) that monitor and control photovoltaic installations from small residential to large commercial and industrial scale. Its technology stack combines proprietary data logger hardware (RS485/Ethernet interfaces supporting Modbus TCP/RTU, IEC 104, IEC 101) with the cloud-based PLEXLOG Portal, which enables white-label branded monitoring for resellers managing multiple end-customer installations. Complementary software modules handle surplus-based control of heat pumps, heating elements and EV chargers (SmartEnergy), remote grid-operator connectivity (Fernwirkanbindung), and VDE-AR-N 4110 grid compliance (EZA-Regler), with the PLEX.IO Gateway accessory extending RS485 connectivity over local networks.

The company's product differentiation rests on the breadth of its compatibility library — 70+ inverter brands (Huawei, SMA, Fronius, SolarEdge, Growatt, Goodwe, FoxESS, Sungrow, Kostal, E3/DC, KACO, etc.), 50+ smart meter brands (Janitza, ABB, Carlo Gavazzi, Eltako, Lovato), major wallboxes (KEBA, Alfen, ABB Terra) and heat pumps (Weishaupt), plus a profile library covering 110+ German and European grid operators. The PL500+ carries a VDE-AR-N 4110 component certificate, and PlexLog holds ISO 9001:2015 quality management certification from TÜV Rheinland, both of which are procurement-relevant for medium-voltage and utility-scale PV projects. The company reports experience from thousands of projects across SmartEnergy, Mieterstrom (tenant electricity), remote grid connection, and power management.

PlexLog operates exclusively as a B2B vendor, selling through authorized installer networks, electrical wholesalers, and direct dealer sales to professional installers and resellers in Germany and broader Europe; it does not sell directly to end consumers. Revenue is generated through hardware device sales (PL40/PL100/PL500+ and the PLEX.IO Gateway), recurring portal subscription fees for the monitoring and white-label platform, and professional training and certification services for installer partners. The company is privately held by its two Managing Partners (Geschäftsführende Gesellschafter), Bastian Gontek and Michael Gottensträter, with no disclosed external funding, M&A activity, or institutional investors. Go-to-market relies on the PLEXLOG dealer contact channel, an extensive documentation portal (doc.plexlog.de), a YouTube training channel, recurring in-person training in Osnabrück, and active participation at Intersolar Europe.

Name

PlexLog

Legal name

PLEXLOG GmbH

Website

https://plexlog.de

Company type

Private

Founded year

2015

Operating status

Operating

Headcount range

1–10 employees

Short description

PLEXLOG GmbH is a German B2B specialist in PV monitoring and energy management, selling hardware data loggers (PL40, PL100, PL500+) and a white-label cloud portal exclusively to installers, resellers, and electricians across Germany and Europe.

Ownership category

akta.pro rank

Product category

PV Monitoring and Energy Management Hardware

NAICS

Electric Power Transmission, Control, and Distribution (22112), Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services (518)

SIC

Electric Services (4911)

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), Customer Grid-Edge Enablement Services (HEMS/DR Device Integration, VPP Enablement) (EUAEANAL)

Keywords

• PV monitoring systems
• Energy management hardware
• Solar data loggers
• Photovoltaic monitoring software
• Grid integration solutions

Headquarters

HQ city

Osnabrück

HQ country

Germany

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Hardware Devices: Sale of physical PLEXLOG Energiemanager devices (PL40, PL100, PL500+) - data loggers for PV system monitoring and control.
2. Portal/Software Services: Recurring portal access fees for professional monitoring platform with branding capabilities, customer management, and analysis tools.
3. Training Services: Training sessions and certifications for installers and resellers on PLEXLOG product installation, configuration, and troubleshooting.

Go-to-market motion2 records

Distribution channels3 records

Marketing channels6 records

Core offering

PLEXLOG manufactures and sells hardware energy managers (PL40, PL100, PL500+) for monitoring and controlling photovoltaic installations of any size, paired with the cloud-based PLEXLOG Portal for centralized plant, customer, and energy flow management. The integrated offering enables surplus-based control of heating elements, heat pumps, and EV chargers, supports grid operator compliance (VDE-AR-N 4110) via Fernwirkanbindung and EZA-Regler functions, and integrates with 70+ inverter brands, 50+ smart meter brands, and 110+ grid operator profiles. Sold exclusively through authorized installers, resellers, and direct dealer contact for the German and European solar market.

Product overview

PLEXLOG is a German system provider of smart monitoring and control technology for photovoltaics and energy management. The product portfolio centers on three energy manager models (PL40, PL100, and PL500+) designed for small to large PV installations, complemented by the PLEXLOG Portal cloud platform for centralized monitoring and management. The offering includes SmartEnergy for excess-based consumption optimization, Fernwirkanbindung for grid operator remote control connectivity, and EZA Regler for VDE4110 compliance. A PLEX.IO Gateway accessory extends connectivity options. All devices are remotely configurable, providing professional plant monitoring with extensive protocol support for inverters, meters, storage systems, heat pumps, and EV charging stations from numerous manufacturers.

Differentiator

Problem solved

Functional benefit

Products and services

• PL40 Entry-level PLEXLOG energy manager (data logger) designed for small photovoltaic installations. Monitors and controls PV plants with excess energy management for heating elements, heat pumps, and charging stations. Sold exclusively B2B to professional PV installers and electricians.
• PL100 Mid-range PLEXLOG energy manager for medium-sized PV installations. Supports Master-Slave configuration, advanced monitoring and control functions, and grid compliance features including VDE-AR-N 4110 support. Sold exclusively B2B to professional PV installers and electricians.
• PL500+

Quantifiable outcome

• Compatible with 70+ inverter brands and 50+ smart meter brands
• +1 more outcomes

Segments3 records

Ideal customer profiles2 records

Technology focussed Yes

API detail

Has API

Yes

API docs

API detail

Core technology

AI maturity

App detail

Feature7 records

Partnerships

18 partnerships are on record, tiered core, major and minor.

• Huawei (Inverter Compatibility)coreTechnology or IntegrationTechnical integration enabling PLEXLOG to communicate with Huawei Sun2000 inverters and SmartLoggers via RS485 and Ethernet interfaces using proprietary protocols.
• SMA Solar Technology (Inverter Compatibility)coreTechnology or IntegrationIntegration supporting SMA inverters including Sunny Boy, Sunny Tripower, and SMA Core 2 through RS485 and Ethernet connections with SunSpec protocol support.
• Fronius (Inverter Compatibility)coreTechnology or IntegrationSupport for Fronius Datamanager, Solar.Net, and SunSpec compatible inverters via RS485, RS422, and Ethernet interfaces.
• SolarEdge (Inverter Compatibility)coreTechnology or IntegrationCompatibility with SolarEdge inverters including VDE-4110 certified models for grid connection compliance, via RS485 and Ethernet.
• Growatt (Inverter Compatibility)coreTechnology or IntegrationTechnical integration with Growatt brand inverters through RS485 interface for monitoring and control.
• Goodwe (Inverter Compatibility)coreTechnology or IntegrationSupport for Goodwe inverters including Sunspec models via RS485 and Ethernet connections.
• FoxESS (Inverter Compatibility)coreTechnology or IntegrationIntegration with FoxESS inverter series including S, T, and H3 Pro models via RS485 interface.
• Sungrow (Inverter Compatibility)coreTechnology or IntegrationCompatibility with Sungrow inverters and SmartLoggers via RS485 and Ethernet for monitoring and control.
• Janitza (Smart Meter Compatibility)majorTechnology or IntegrationSupport for Janitza power meters including UMG 604, UMG 507, UMG 96, and EMD models for energy measurement and monitoring.
• ABB (Smart Meter & Inverter Compatibility)majorTechnology or IntegrationCompatibility with ABB Modbus meters (B23, B24 series) and PowerOne inverters via RS485 and Ethernet interfaces.
• KEBA (Wallbox Compatibility)majorTechnology or IntegrationIntegration with KEBA EV charging stations including P40 series with Modbus TCP support for smart charging based on PV surplus.
• Alfen (Wallbox Compatibility)majorTechnology or IntegrationSupport for Alfen EV charging stations with Load Balancing functionality via Modbus TCP for integrated PV-electric vehicle charging solutions.
• E3/DC (Inverter Compatibility)majorTechnology or IntegrationTechnical integration with E3/DC energy systems including hybrid inverters and storage solutions via Ethernet interface.
• KACO (Inverter Compatibility)majorTechnology or IntegrationSupport for KACO brand inverters via RS485 interface for monitoring and control.
• Kostal (Inverter & Meter Compatibility)majorTechnology or IntegrationCompatibility with Kostal inverters and Smart Energy Meters via RS485 and Ethernet with Modbus and SunSpec protocol support.
• 110+ German and European Grid OperatorscoreTechnology or IntegrationComprehensive grid operator profile library supporting remote grid connection (Fernwirkanbindung) with utilities including E.DIS, Bayernwerk, Avacon, EWE NETZ, Westnetz, Netze BW, Stromnetz Berlin, and 100+ more through IEC 101, IEC 104, and Modbus protocols.
• Brevo (Sendinblue)minorOthersEmail marketing platform used for newsletter distribution and customer communication.
• StripeminorOthersPayment processing platform used for end-customer payment transactions in the portal.

Scale indicators1 record

Recent moves6 records

Expansion highlights5 records

Direct peers

• E3/DC: E3/DC builds residential and commercial hybrid inverter + battery systems with an integrated monitoring portal — overlap with PlexLog's PL series both technically (E3/DC inverters are PlexLog-compatible) and commercially, as both target self-consumption optimization in the German market.
• Meteocontrol: Meteocontrol provides professional PV monitoring, remote grid control, and direct-marketing services for utility-scale and commercial solar in Germany and Europe. The company's VDE-compliant Fernwirk solutions and grid operator communication stack overlap directly with PlexLog's PL500+ and Fernwirkanbindung offerings.
• SolarLog: SolarLog is one of the closest direct competitors to PlexLog, offering PV data loggers and a web/mobile portal for installers and plant operators across Europe. Both companies focus on cross-vendor inverter compatibility, cloud monitoring, and direct marketing integration for the German market, making them head-to-head in the installer channel.

Emerging players

• Tigo Energy: Tigo Energy provides module-level monitoring and rapid shutdown devices alongside an energy communications platform that aggregates data from heterogeneous inverters. Tigo's focus on multi-vendor visibility overlaps with PlexLog's interoperability proposition, particularly in commercial and C&I retrofit scenarios.

Broad incumbents

• Enphase Energy: Enphase's microinverter architecture ships with its Enlighten monitoring platform and is rapidly expanding across European residential solar. While not listed in PlexLog's current compatibility matrix, Enphase represents the broader category threat of integrated inverter+monitoring displacing third-party loggers.
• SolarEdge Technologies: SolarEdge ships its own monitoring platform and apps tied to its optimizer + inverter architecture, with growing presence in European commercial PV. PlexLog lists SolarEdge as compatible while SolarEdge's native tools compete for the same monitoring budget on every install.
• KOSTAL Solar Electric: KOSTAL Solar Electric manufactures string inverters and offers the KOSTAL Solar Portal for plant monitoring and energy management. It is both a listed compatibility partner for PlexLog and a competing monitoring provider that bundles its portal with installed inverters — directly contesting third-party logger value.
• Huawei Digital Power (FusionSolar): Huawei's FusionSolar platform is one of the largest inverter-bundled monitoring ecosystems globally and is explicitly listed by PlexLog for compatibility. With strong pricing pressure on Huawei inverters, its bundled monitoring is a meaningful alternative to an independent logger in cost-sensitive bids.
• Fronius International: Fronius offers Solar.web, one of the most widely used inverter-bundled monitoring platforms in Europe, alongside its Symo/Piko inverter portfolio. Fronius's deep installer relationships and free monitoring tier make it a key alternative to a third-party logger for both residential and commercial projects.
• SMA Solar Technology: SMA is the dominant German inverter manufacturer with its own Sunny Portal/Sunny Boy/Cloud monitoring ecosystem. While SMA inverters are listed as compatible with PlexLog, SMA's bundled portal is the primary substitute product installers face when deciding whether to specify an independent logger.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks5 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/@PLEXLOG
• Xx.com/plexlog

Compliance2 records

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 PlexLog