Some of the solar panels, inverters, charge controllers, batteries and other solar PV components such as energy storage for grid tie and off-grid electricity generation are are available for Next Day Delivery as well.
String Inverters
String Inverters for Professional Solar Installers & EPC Projects
Grid-Tied String Inverters โ Certified, Scalable, and Stocked in the EU
At 3Buy Solar, we stock a carefully selected range of string inverters optimized for European grid standards and designed to meet the exacting requirements of professional solar installers, PV system integrators, and EPC contractors. Whether you’re designing a single-phase rooftop system or a multi-megawatt 3-phase array, our product range supports reliable, scalable, and cost-effective grid connection.
All models are certified for EN50549, VDE-AR-N 4105, and G98/G99 compliance and include pre-tested compatibility with most monocrystalline solar panels, bifacial modules, and hybrid energy storage systems.
What Are String Inverters?
String inverters are the core of traditional grid-tied PV systems. They aggregate DC output from multiple PV panels into a single AC output, which is then fed into the electrical grid or a buildingโs load.
Ideal for systems with uniform panel orientation and exposure, string inverters provide:
- High efficiency power conversion (97%โ99%)
- Streamlined installation and maintenance
- Lower cost per watt compared to microinverters
They remain the most common inverter type used across residential, commercial, and industrial solar PV installations.
Key Features of Todayโs Professional-Grade String Inverters
Modern string inverters are no longer simple DC-to-AC convertersโtheyโre highly intelligent devices designed to manage energy yield, grid interaction, safety, and diagnostics. Below are the core features that make the models we stock suitable for professional, long-term deployment.
1. High MPPT Tracking Precision
Every inverter we offer is equipped with dual or multi-MPPT tracking. This allows PV strings connected at different orientations or tilt angles to be managed independently, optimizing performance in:
Eastโwest rooftop configurations
Arrays with partial shading from chimneys or skylights
Commercial systems spread across split-level roofs
Smart MPPT control maximizes your systemโs real-time output, especially under changing irradiance and temperature conditions.
2. Grid Compliance & Smart Safety Functions
All inverters are fully certified for European installations, including national grid codes in Germany, France, the UK, Spain, and the Netherlands. Key compliance and safety features include:
Anti-islanding protection to ensure safe disconnection in outage scenarios
Zero-export settings, important for jurisdictions requiring controlled grid feed-in
Frequency and reactive power support, ensuring grid stability under dynamic load conditions
Remote monitoring via app/web portal for installers and owners
Over-the-air (OTA) firmware updates, futureproofing your installation
Built-in AFCI (Arc Fault Circuit Interrupters) to reduce fire risks
Integrated RCDs or RCMUs, meeting local safety inspection standards
These features are essential for passing grid inspections, reducing O&M risk, and maintaining long-term warranty eligibility.
3. Compatibility with Energy Storage Systems
Although traditionally used in grid-tied systems, todayโs string inverters often support hybrid configurations, especially when paired with:
AC-coupled battery storage units (like BYD, Pylontech, LG Chem)
Modular battery-ready systems (e.g., SolaX and Fronius inverters with hybrid upgrade paths)
Zero-export controllers and smart meters, enabling future-ready energy management
This makes them ideal for installers who want to provide their clients with a grid-connected system today, but a hybrid-capable upgrade path tomorrow.
Our team can assist in confirming compatibility with both new and legacy energy storage hardware.
Recommended String Inverter Sizes by Application
Choosing the correct string inverter size is critical to ensuring system performance, grid compliance, and long-term yieldโespecially for professionals designing residential, commercial, or large-scale systems. Below is a practical guide to inverter sizing by application tier.
System Size | Typical Inverter Output | Configuration Type | Real-World Application |
---|---|---|---|
3kW โ 10kW | 1-phase 3.6kW โ 10kW | Single or Dual MPPT | Private homes, villas, retrofit rooftops with consistent orientation. Typically paired with 400โ450W monocrystalline panels. Ideal for low-voltage residential circuits in DE, FR, and IT. |
10kW โ 30kW | 3-phase 10kW โ 30kW | Dual or Quad MPPT | Apartment blocks, office buildings, and workshops. Supports varied roof layouts and different PV string lengths. Compatible with most EN50549 and G99 local codes. |
50kW โ 100kW | 3-phase high-voltage | External DC combiner ready | Warehouses, logistics hubs, and flat-roof C&I sites. Often installed in clusters across larger surface areas with multiple MPPT channels for shading compensation. |
100kW and above | Modular string inverter banks | Distributed or clustered architecture | Solar farms, agricultural PV, and municipal-scale PV systems. These systems often leverage containerized combiner setups or string banks with built-in redundancy. |
For each of these use cases, 3Buy Solar can assist in matching the inverterโs voltage window, MPPT range, and string count to your PV layout, whether youโre using monocrystalline, glass-glass, or bifacial modules.
Featured Brands โ Certified String Inverters in Stock
All string inverters available at 3Buy Solar are handpicked based on market demand, long-term reliability, and compliance with European grid codes. Below is a snapshot of top brands trusted by installers and EPC professionals across the EU.
Growatt
Growatt MOD series inverters (e.g. MOD 10KTL3-X) offer an excellent balance between price and performance. With smart energy monitoring via ShineLink, dual MPPT inputs, and built-in surge protection, Growatt remains a top choice for installers working on residential and small C&I installs. Popular across Central Europe and fast-growing in Eastern EU markets.
Fronius
Made in Austria, Fronius string inverters like the Symo, Primo, and Eco models are built for grid-sensitive installations. These inverters feature active cooling, flexible input voltage ranges, and zero-export firmware settings, making them a trusted choice for installers in Germany, Austria, and the Benelux region. Their SnapINverter design also simplifies wall-mounting and serviceability.
Solis
Solis 3-phase inverters are often used in public-sector tenders or EU-funded solar projects where G98/G99 certification is required. Their integrated AFCI protection, high efficiency, and compact footprint make them ideal for educational buildings, light commercial sites, and co-op housing energy upgrades. Solis models are also favored in Ireland and the UK for their utility approval.
Sungrow
As one of the worldโs largest inverter manufacturers, Sungrow offers a versatile portfolio of industrial-grade string inverters for high-output applications. Known for their wide MPPT voltage range, low startup voltage, and robust thermal management, Sungrow units excel in large C&I systems and solar park deployments. Units such as the SG50CX are particularly popular in Southern Europe, including Italy, Portugal, and Greece.
SolaX
SolaX Power offers a wide range of grid-tied and hybrid-compatible string inverters. The X3 G4 and X1 Boost models feature dual MPPTs, WiFi app control, and plug-and-play integration with SolaX hybrid inverters and SolaX Triple Power batteries. This makes SolaX an excellent option for scalable residential and battery-ready commercial systems.
Technical Documentation & Engineering Support for String Inverter Projects
At 3Buy Solar, we donโt just ship string invertersโwe support every order with detailed, procurement-ready documentation and hands-on technical guidance. Whether youโre specifying components for a residential rooftop in Northern Europe or designing a C&I system in a southern solar zone, our team ensures that your inverter choice is not only compatible, but optimized for yield, compliance, and long-term serviceability.
Whatโs Included with Every Inverter Model
Full technical datasheets, including AC and DC voltage windows, MPPT tracking tolerances, maximum input current ratings, and derating curves for altitude and temperature.
Grid compliance certificates such as CE Declaration of Conformity, VDE-AR-N 4105, G98/G99, EN50549, and moreโmeeting country-specific installation requirements across the EU and UK.
Detailed wiring diagrams and layout templates, including recommended AC/DC cable sizing, protective component specs (MCBs, SPD, RCDs), and physical dimensions for wall or rack mounting.
Mounting and commissioning guides, with clear step-by-step instructions for WiFi pairing, app configuration, and remote firmware setup. Our supported brands include integration with SolarAssistant, ShineLink, and Fronius Solar.web.
Multilingual installer documentation, available in English, German, Spanish, French, Italian, and Dutchโideal for international EPCs, subcontracted installation teams, or cross-border logistics.
Project-Level Engineering Support
For professionals sourcing equipment for grid-connected systems, retrofits, or public tenders, we also offer system-level assistance such as:
PV panel to inverter matching: We calculate ideal string lengths, MPPT utilization, and DC/AC oversizing ratios based on your solar panel type (monocrystalline, bifacial, or dual-glass modules), orientation, and expected irradiance.
Voltage window and startup behavior modeling: Critical for ensuring cold-start operation in Northern climates or partial shading conditions.
BOM (Bill of Materials) support: We help you build out a compliant, supplier-verified materials list for procurement, RFQ responses, and project tenders.
Load balancing and phase coordination: Our engineers assist with inverter placement and string configuration in three-phase systems where phase symmetry is required.
Hybrid system planning: If your string inverter is being used in combination with AC-coupled storage or is part of a future upgrade to a hybrid inverter, we help ensure compliance and inverter compatibility across brands.
Support Beyond the Datasheet
Unlike many catalog-based suppliers, we specialize in supporting professionals who need practical technical advice, not just links to documentation. Our team of engineers and product specialists:
Respond to sizing inquiries within 24 hours
Can provide custom wiring schematics upon request
Offer video call or remote commissioning assistance for selected projects
Whether youโre outfitting a 5kW rooftop or a 250kW warehouse array, our documentation and technical service are designed to reduce risk, save time on-site, and improve your systemโs long-term ROI.
Related Products You Might Need
- Looking for solar panels? Visit our full range of monocrystalline panels or bifacial PV modules
- Want to build a hybrid-ready system? Explore hybrid inverters or solar energy storage batteries
Why Buy String Inverters from 3Buy Solar?
- Real-time inventory from EU-based warehouses
- Certified models only from Tier 1 and high-trust manufacturers
- Installer-grade documentation and support
- Pallet and volume pricing for distributors & EPCs
- Transparent delivery timelines with pre-logistics integration
Are you looking for solar trainings online? Further info on 3Buy and individual pv products? Visit our 3Buy Solar Youtube Channel.
Buy Grid Tie String Inverters Online with 3Buy Solar
Browse our category of grid tie solar string inverters designed for installers, off-grid integrators, and lightweight solar engineering professionals. Stock is held in the EU and available for fast shipment with full documentation.
3Buy Solar โ Your Reliable Supplier of Certified String Inverters in Europe
Need installation support? We can connect you with certified solar pros across Europe.. You may want to check out a solar installer in your area as well or contact us.