Off-Grid Inverters

Off-Grid Inverters for Professionals

sun.store serves as a dedicated B2B marketplace for installers and EPC companies seeking reliable off-grid inverters and related components. The platform brings together verified European suppliers, providing transparent access to stock availability, technical documentation, and competitive pricing for professional projects.

Installers benefit from instant access to comprehensive inverter datasheets, enabling precise selection according to voltage, battery compatibility, and safety standards. The marketplace supports comparisons across multiple solar inverter brands, helping professionals find certified inverters that align with project scale, energy requirements, and warranty preferences. By streamlining procurement, sun.store simplifies sourcing of standalone inverters for both small residential systems and large commercial installations.

Types of Off-Grid Inverters

3-phase Inverters

Three-phase inverters are engineered for larger off-grid energy systems, ensuring even load distribution across all three phases. They are typically used in industrial and commercial setups requiring high output and stable operation. These PV inverters offer efficient power conversion, reliable BMS integration, and compatibility with heavy-duty equipment in hybrid or generator-assisted systems.

1-phase Inverters

Single-phase inverters are most commonly used in smaller, residential installations or off-grid cabins. Compact and easy to install, they are designed for low to medium loads and deliver a pure sine wave output compatible with sensitive electronics. Their flexibility makes them ideal for self-consumption systems using solar panels and energy storage.

Transformerless Inverters

Modern transformerless inverter designs eliminate bulky transformers, resulting in lighter, more compact devices with increased inverter efficiency. Despite their simpler design, they ensure electrical isolation through advanced circuitry and built-in protection devices. These models are popular in both solar power inverter and battery inverter configurations due to their low energy loss and durable construction.

Power Capacity Options

Residential (≤ 5 kW)

Compact off-grid inverters in this category are built for private homes, cottages, and small autonomous systems. They commonly integrate with solar inverter with battery setups for essential household consumption, ensuring stable operation during outages or in fully off-grid environments.

Light Commercial (6–15 kW)

Mid-range standalone inverters are suitable for small businesses, farmhouses, and rural enterprises. They balance efficiency and scalability, handling variable loads while maintaining optimal system performance.

Medium Commercial (16–20 kW)

Larger off-grid inverters in this range serve multi-building sites or hybrid setups combining solar generation with generator backup. These units enable smart load management, energy storage control, and integration with microinverter or hybrid inverter technologies.

Battery Integration and Management

The defining feature of an off-grid inverter is its ability to directly manage energy storage systems. Acting as a battery inverter, it regulates charging, discharging, and energy flow, maintaining system stability. Most models feature MPPT charge controllers and BMS integration, ensuring safe and efficient power conversion across various battery technologies.

Battery Charging Capabilities

Professional-grade off-grid inverters use multi-stage charging algorithms — bulk, absorption, and float — to optimise energy use. Many offer programmable current and voltage settings, along with automatic adjustment based on battery temperature or charge level. Some models include equalisation features for lead-acid batteries and customised profiles for lithium-based storage, ensuring long-term reliability.

Battery Management Systems (BMS)

Advanced BMS integration enables direct communication between the inverter and battery. Monitoring functions typically include voltage, current, and temperature tracking, alongside protection against overcharge, deep discharge, and short circuits. These built-in control systems safeguard battery health and extend service life in demanding energy storage systems.

Compatible Battery Types

Off-grid inverters support multiple battery chemistries:

Lead-acid (AGM, GEL): Proven, cost-effective options suitable for small-scale systems.

Lithium-ion (LiFePO4): High-performance solutions offering excellent efficiency and deep cycle capability.

Nickel-based batteries: Durable alternatives for specific industrial or backup uses.

For optimal performance, battery capacity and voltage should be carefully matched to the inverter power output and system design.

Leading Off-Grid Inverter Brands Available

sun.store features a selection of leading solar inverter brands trusted across Europe, including SMA, Solis, Growatt, Victron Energy, and Sungrow. These manufacturers are recognised for advanced PV inverter technology and robust product portfolios.

SMA: High-end solar battery inverters with integrated monitoring and hybrid operation modes.

Solis: Compact and reliable residential and commercial units with efficient MPPT tracking.

Growatt: Known for flexible designs and comprehensive inverter monitoring tools.

Victron Energy: Specialist in off-grid and marine applications with adaptable BMS integration.

Sungrow: Produces pure sine wave models with strong safety standards and competitive warranty coverage.

Together, these brands represent some of the best inverters for solar systems, supporting diverse installation needs across Europe.

Key Technical Specifications

Essential inverter features considered by installers include:

Input Voltage Range: Accommodates varying solar panel string configurations.

MPPT (Maximum Power Point Tracking): Ensures optimal energy yield under fluctuating sunlight.

Efficiency: Top-tier solar power inverters achieve up to 98% conversion rates.

Battery Compatibility: Supports 12V, 24V, and 48V configurations.

Protection Devices: Built-in surge arresters, short-circuit, and thermal protection systems.

Monitoring: Wi-Fi, RS485, or Bluetooth connectivity for remote analysis and inverter monitoring.

Pure Sine Wave Output: Guarantees stable operation of sensitive loads.

Cooling System: Intelligent fan or natural convection cooling for long-term reliability.

These specifications ensure operational safety, strong performance, and minimal downtime across a wide range of system sizes.

Services Tailored for Installers

sun.store provides a professional sourcing experience for installers, featuring:

Bulk purchasing and project-specific quotes.

Delivery coordination and logistics across Europe.

Instant access to detailed datasheets, certifications, and manuals.

Comparison of off-grid inverter models based on efficiency, output class, and safety standards.

This structure allows installers to buy off-grid inverters with full visibility of stock, technical details, and supplier credibility.

Certifications and Safety Standards

All off-grid inverters listed on sun.store comply with key global and European safety standards, including:

IEC 62109, UL 1741, and EN 61000 for electrical safety and electromagnetic compatibility.

IP65 or IP66-rated enclosures for dust and water protection.

Integrated protection devices ensuring safe and autonomous system operation.

These certified inverters undergo extensive testing to ensure durability, reliability, and compliance with international safety standards, facilitating smooth project approval across various markets.

Resources and Help for Installers

sun.store ensures transparency and accessibility of all product documentation. Each inverter listing includes downloadable datasheets, wiring diagrams, and installation manuals. Technical specialists are available to clarify specifications or compatibility with specific batteries, solar panels, or accessories. While no dedicated training programme is currently offered, the sun.store team supports professionals in selecting the right off-grid inverter and ensuring proper configuration within energy storage systems. This approach promotes informed decision-making and reliable project execution.