EV Accessories and Mounting
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.
SMA Sunny Island X 50 Three Phase 50kW Battery Inverter SI50-20
The SMA Sunny Island X 50 is a powerful 50kW three-phase battery inverter for on-grid and off-grid solar systems. Scalable, smart, and compatible with a wide range of batteries, it’s perfect for solar installers, DIY solar users, and energy resellers. Built in Germany for maximum reliability and performance—even in extreme conditions.
9079.80 €
Available on backorder
Available on backorder
2
People watching this product now!
-
Pick up from the 3Buy Solar Warehouse
To pick up today
Free
-
Courier delivery
Our courier will deliver to the specified address (Delivery Terms apply)
2-7 Days
Free
-
DHL Courier Next-Day delivery
DHL courier will deliver to the specified address
1-3 Days
From €10
-
Product warranty up to 25 years
Payment Methods:
Product description
SMA Sunny Island X 50
The most reliable 50kW power for home and business
Extensive battery integration, integration of generators or utility grids in off-grid installations, scalable.
SMA Sunny Island X 50 Three Phase 50kW Battery Inverter at Best Price
The SMA Sunny Island X 50 Three Phase 50kW Battery Inverter is the next evolution in energy storage and power reliability. Whether you’re installing a complex grid-tied solar system, setting up off-grid power for a remote property, or upgrading energy solutions for your clients, this high-performance battery inverter offers unmatched versatility and efficiency.
Built for On-Grid and Off-Grid Power Systems
Designed for both on-grid and off-grid applications, the Sunny Island X 50 seamlessly stores and delivers self-generated solar energy whenever it’s needed. Thanks to its advanced design, it supports a wide range of battery technologies, making it ideal for solar professionals, DIY solar system builders, and renewable energy resellers.
Flexible and Modular Energy Storage
The modular system architecture of the SMA Sunny Island X 50 allows easy customization of both AC power output and battery capacity. Whether you’re working on a small-scale project or a large commercial installation, you can scale the system to meet exact energy demands. It integrates effortlessly with DC and AC components, and when paired with the Sunny Island X Connection Box, even generators or the public utility grid can be added to your setup.
One product to match all different commercial PV scenarios
The 50kW Sunny Island battey Inverter is THE inverter
Exceptional Performance, Even in Extreme Conditions
Engineered to deliver full nominal power even at ambient temperatures up to 45°C, this robust inverter is built for challenging environments. It ensures stable load supply, smart energy management, and real-time control of energy flows, all without compromising on performance.
Smart Monitoring with Sunny Portal powered by ennexOS
Manage your energy systems more intelligently with Sunny Portal powered by ennexOS. This intuitive platform offers complete visibility of all your system components, making remote monitoring and control simple and reliable. Whether you’re tracking usage, analyzing system performance, or managing multiple inverters, you’ll always stay connected.
Key Features & Benefits
50kW nominal power output – Ideal for commercial and industrial solar storage systems – check 3v3rything in our solar shop
Three-phase inverter – Ensures balanced load distribution and optimal performance
Modular scalability – Expand AC and battery capacity as needed
Wide battery compatibility – Works with multiple battery chemistries
Integrated energy management – Maximizes efficiency in grid-tied systems
Generator and grid integration – For hybrid or off-grid applications (via Connection Box)*
Smart system monitoring – View, track, and manage energy flows via Sunny Portal
German engineering – Manufactured to the highest quality and cybersecurity standards
Extended warranty – 10-year coverage (5+5 years with product registration)** Extended warranty available with product registration at my.sma-service.com
Why Choose the Sunny Island X 50?
If you’re looking for a battery inverter that adapts to your energy needs, the SMA Sunny Island X 50 delivers. Whether you’re optimizing self-consumption, building energy independence, or expanding your service offering as a solar installer or reseller, this inverter ensures flexibility, reliability, and long-term performance.
Made in Germany and backed by SMA’s world-class support, the Sunny Island X 50 is an investment in the future of energy. Grid tie? You need an SMA EV charger?
Ideal For:
Professional solar system installers
Off-grid cabin and homestead builders
Commercial-scale energy storage projects
Battery resellers and renewable energy providers
DIY solar enthusiasts building scalable solar systems
Get in touch today to learn more about the SMA Sunny Island X 50 or to request a quote tailored to your project. You need a Solplanet inverter for your solar panel system in your home? Sign in to one of our SMA webinars.
The SI50-20 represents a leap forward in SMA’s commitment to smarter, more adaptable energy solutions. As part of the Sunny Island X series, it’s designed for professionals and solar pioneers who need more than just power—they need a system that can grow, adapt, and perform under pressure.
This 50kW three-phase battery inverter is purpose-built for modern energy infrastructures, supporting everything from large-scale storage systems to remote off-grid power setups. Its architecture makes it ideal for complex installations where system design flexibility, long-term reliability, and energy independence are essential.
Thanks to its integration potential with components like the Sunny Island X Connection Box, the SI50-20 allows for hybrid configurations that combine battery storage with grid or generator input—making it a strong choice for both backup systems and standalone solar projects.
With the SI50-20, you’re not just installing an inverter—you’re building a smarter, future-ready energy backbone.
Product Datasheet and Downloads
Installation and User Manual SMA Sunny Island X 30 – 50 EN
QUICK Installation Guide SMA Sunny Island X 30 – 50 EN
Installations- und Benutzerhandbücher SMA Sunny Island X 30 – 50 DE
Manufacturer Warranty SMA Sunny Island X 30 – 50 Series
Specification
Manufacturer
| Brand |
SMA |
|---|
Technical Specifications
| Weight | 104 kg |
|---|---|
| Dimensions | 772 × 837.3 × 443.8 mm |
| Product Category |
Battery Inverter ,Inverters |
| Brand |
SMA |
| Phases Describes the electrical phase configuration—Single-phase for residential use, Three-phase for commercial or industrial systems, and Split-phase common in North American households. |
Three Phase |
| Rated Power [W] Indicates the maximum continuous power output or input the device can handle under standard operating conditions, measured in watts (W). |
51 kW |
| Nominal AC Power [W] Nominal AC power refers to the rated output power of an inverter in alternating current (AC) form under standard operating conditions. It is usually expressed in watts (W) and represents the maximum continuous power an inverter can supply to an AC load without causing any damage or operational issues. |
50kW |
| Nominal Voltage [V] The nominal voltage is defined as the voltage value assigned to an electric circuit or system to designate its voltage class. In simple words, the voltage level of an electrical power system is called the nominal voltage of the system. |
400V |
| Nominal Current [A] Nominal current is essentially the normal electrical current that we would expect to flow through a circuit at any given time. |
75.5A |
| Nominal AC frequency [Hz] Nominal frequency is the frequency specified by the manufacturer or supplier for a device in normal operation. 60Hz systems tend to be more efficient for longer distance transmission and are better suited for high-power applications, while 50Hz systems are more suited for low-power, local distribution. In the U.S. and many other places it is 60Hz. In Europe and many other places it\'s 50Hz. |
50Hz ,60Hz |
| Inverter Type An inverter type refers to the specific technology and functionality of a solar inverter. The main types include grid-tied, off-grid, and hybrid inverters. Each serves a different purpose: |
Hybrid ,On-Grid (Grid Tie) An off-grid inverter is a key component in a standalone solar system, converting the DC energy from your solar panels into usable AC power without relying on the grid. Perfect for remote locations, cabins, or areas with unreliable grid access, these inverters store excess energy in batteries for use when sunlight isn’t available. ,Off-Grid (Stand-Alone) |
| MPPT Voltage Range [V] The MPPT (Maximum Power Point Tracking) voltage range refers to the range of input voltages at which an MPPT solar charge controller or inverter can operate efficiently to optimize the power output of a solar panel or array. |
200V – 980V ,200V-1000V |
| Max. PV array input power [Wp] The PV array power is the maximum power of the PV modules connected to one PV inverter. |
51000W |
| Max. continuous output power [VA] As a unit of measurement for electrical power, VA represents how much energy a device consumes or produces or how much current it draws from the electrical circuit. In electrical circuits, power is measured in volts (V), as well as in amperes (A). |
50000 |
| Max. PV input voltage [V] Maximum PV voltage, which is an absolute limit of the voltage of PV panels connected in series, and “nominal PV power”. If more wattage is available from the panels, the controller won\'t use it, it will just limit the current to what it can handle. |
1000V ,980V |
| Communication Specifies how the device communicates with other systems or networks—options include RS485, CAN, LAN, Wi-Fi, 4G, and Optical for data exchange and remote monitoring. |
4G ,LAN ,WIFI |
| Protection Rating [IP] IP (or \"Ingress Protection\") ratings are defined in international standard EN 60529 (British BS EN 60529:1992, European IEC 60509:1989). They are used to define levels of sealing effectiveness of electrical enclosures against intrusion from foreign bodies (tools, dirt etc) and moisture. |
IP66 Completely dust-tight (no ingress of dust, objects, or airborne debris permitted) Protects against splashing, falling, or dripping water. Protects against hose-directed water, from any direction, using a nozzle of 12.5 mm or smaller at higher pressures. |
| Warranty Normally covers, manufacturing defects, durability issues, or equipment failure. The warranty typically covers the cost of replacing the faulty or damaged panel with a new working one. Please refer to the Warranty Documents of the product on the Manufacturer s webpage. |
5 Years ,Extended Warranty Available |
The information provided on this page is a general summary only. For precise, detailed specifications and the latest updates, please refer to the product datasheet and visit the manufacturer's website. We recommend consulting with a licensed installer or contacting 3Buy Solar for further assistance.
Related Products
10 Year Warranty Extension for Solax Inverters
In stock
738.33 € – 1721.21 €
Select options
This product has multiple variants. The options may be chosen on the product page
SMA EV Charger Business 2x 22kW
In stock
1879.80 €
Select options
This product has multiple variants. The options may be chosen on the product page
Customer Reviews
Only logged in customers who have purchased this product may leave a review.
As a leading global specialist in photovoltaic system technology, SMA is setting the standards today for the decentralized, digital and renewable energy supply of tomorrow. More than 4,000 SMA employees in 20 countries have devoted themselves to this task. SMA Technology AG innovative solutions for every type of photovoltaic application offer people and companies worldwide greater independence in meeting their energy needs. In collaboration with partners and customers, the company is helping people transition to a self-sufficient, decentralized and renewable energy supply.
For 40 years, SMA has been setting technological trends and driving the development of renewable energies. With a groundbreaking inverter technology, SMA has made significant contributions in seeing that renewable energies leave the pioneer phase behind and increasingly become the norm worldwide.
SMA Products sells photovoltaic solar inverters as product families using the Sunny Boy name for home systems, Sunny Tripower and Sunny Highpower for medium-sized plants through the multi-megawatt range and Sunny Central for ground-mounted systems and solar farms, often from 500 kW to the several-megawatt range for self-consumption of solar power and feeding into the utility grid. SMA also produces the Sunny Island for independent, stand-alone systems as well as off-grid and on-grid battery systems, the Sunny Boy Storage and the Sunny Central Storage for grid-tied battery systems of all sizes. The inverter products are complemented by components for energy management, system monitoring and data analysis as well as services ranging to operations and maintenance of large-scale PV power plants.
"Excellent Inverter in my view, pretty much set and forget. Setting up the wifi and app for inverter monitoring was easy following the instructions and very good support."
SMA EV Charger Business 2x 22kW
In stock
1879.80 €
Select options
This product has multiple variants. The options may be chosen on the product page
Reviews
Clear filtersThere are no reviews yet.