--- title: "SMA Solar SI4.4M-13 Off-grid Inverter: Specs & Datasheet | ComparePV" description: "SMA Solar SI4.4M-13 3.3 kW off-grid inverter. Specs: 63 V max DC input, 44.0 kg, 10 yrs warranty." source: "https://comparepv.com/inverter/sma-solar-si4-4m-13" updated: 2026-01-16 --- # SMA Solar SI4.4M-13 ## Identity - **Manufacturer:** SMA Solar - **Model:** SI4.4M-13 - **Series:** Sunny Island - **Rated AC power:** 3.3 kW - **Type:** Off-grid - **Phases:** Single-phase - **Battery port:** yes ## How it compares Compared against 362 inverters from 3 to 6 kW. Ranks are within that class. | Measure | This inverter | Class median | Standing | Rank in class | | --- | --- | --- | --- | --- | | European efficiency | - | 97.2% | | | | MPPT trackers | - | 2 | | | | Max DC input voltage | 63 V | 600 V | Weak - bottom 1% | 316 | | Weight per kW | 13.3 | 3.3 | Weak - bottom 1% | 351 | | Warranty | 10 yrs | 5 yrs | Strong - top 20% | 15 | ## Specification ### AC output - **Rated AC power:** 3.3 kW - **Max apparent power:** 3.30 kVA - **Phases:** Single-phase - **Nominal AC voltage:** 230 V - **Max AC current:** 60.0 A - **Grid frequency:** 50 Hz - **Power factor:** AC-2: 0.8 overexcited (leading) to 0.8 underexcited (lagging) ### PV input - **Max DC voltage:** 63 V - **MPPT voltage range:** 41 to 63 V ### Efficiency - **Max efficiency:** 95.5 % ### Battery - **Battery port:** Yes - **Battery voltage:** 41–63 V (48 V nominal) - **Grid-forming:** Yes ### Physical - **Dimensions:** 612 × 467 × 242 mm - **Weight:** 44.0 kg - **Enclosure:** IP54 - **Operating temperature:** -25 to 60 °C ### Connectivity and protection - **Interfaces:** Ethernet - **Protocols:** Ethernet, Speedwire, Webconnect ### Warranty and certificates - **Warranty:** 10 years ### Pros - **Only IP54-rated high-power battery inverter in its class** - The Sunny Island carries an IP54 protection rating, enabling outdoor installation in partially exposed locations. Key competitors (Victron Energy Quattro, Fronius Symo GEN24 Plus) typically offer IP21-IP22, restricting them to indoor-only installations. - **Scalable to 24 kW, single- and three-phase** - The SI 6.0H and SI 8.0H models can be connected in parallel - up to 3 units per phase - delivering up to 24 kW in single- or three-phase systems. This enables incremental system expansion without replacing the entire installation. - **AC-coupled compatibility and support for over 20 Li-ion battery types** - The inverter operates as a grid-forming AC source, allowing integration with existing PV inverters from various manufacturers in an AC-coupled topology - without replacing the solar inverter. Certified compatibility covers more than 20 lithium-ion battery types (e.g., BYD, PYLONTECH) as well as 48 V lead-acid batteries. - **Up to 97.6% efficiency and operation from -25°C to +60°C** - The SI 6.0H/8.0H models achieve 95.8% efficiency, while the latest-generation Sunny Island X reaches up to 97.6%. The operating temperature range of -25°C to +60°C, with full output power up to +45°C (Sunny Island X), ensures reliable operation in demanding climatic conditions. - **10-year warranty and over 120,000 installations worldwide** - The standard manufacturer warranty is 10 years (upon product registration). SMA brings over 25 years of experience in battery inverters, and the Sunny Island series has been deployed in more than 120,000 installations globally, resulting in a well-documented field reliability track record. ### Cons - **WLAN removed as of August 1, 2025** - From August 1, 2025, SI 6.0H/8.0H units ship without a WLAN module - Ethernet is the only available interface. In installations where running a network cable is difficult or costly, this requires an additional Wi-Fi adapter or router, increasing both cost and installation complexity. - **Competitors (Victron, Selectronic) have accelerated innovation** - In the hybrid energy storage segment, Victron Energy (MultiPlus-II) and Selectronic (SP Pro) have rolled out significant functional updates - such as dynamic charge power limiting and advanced VRM monitoring - while the Sunny Island 6.0/8.0 series has undergone only minor hardware revisions, reducing its functional advantage over these competitors. - **No built-in MPPT - a separate PV inverter is mandatory** - The Sunny Island has no DC input for PV strings. Every solar installation requires a separate MPPT-equipped inverter (e.g., SMA Sunny Boy), adding device cost (approx. 1,500-3,500 PLN depending on power rating) and an additional potential point of failure in the system. ## About this series The SMA Sunny Island series are battery inverters primarily designed for off-grid operation and for building flexible systems with backup power and energy storage. Their key advantage lies in the ability to create a stable AC microgrid and work with AC-coupled systems - this allows you to connect energy storage with PV inverters without needing to replace the entire installation. This solution is particularly valued where grid resilience, generator operation, and intelligent battery charging management are critical. It is worth emphasizing that Sunny Island is not a classic PV inverter - it does not feature an MPPT and does not connect directly to PV string inputs. Instead, it operates as the core of the energy storage system, with PV handling being managed by separate inverters equipped with MPPT, simplifying optimization for different string orientations and shading conditions. A significant benefit is the integrated user interface, along with standard WLAN and Ethernet for configuration and monitoring from a smartphone. The series is compatible with low-voltage 48 V battery storage systems, and the typical manufacturer’s warranty is 10 years. This makes it an excellent choice for homes, farms, and small businesses requiring energy independence. ## Questions ### Can the SMA Sunny Island be connected directly to photovoltaic panels? No, the Sunny Island does not have an MPPT input and cannot be connected directly to PV modules. It serves as the hub of an energy storage system and operates on the AC side. PV panels must be connected through a separate PV inverter with MPPT (e.g., the SMA Sunny Boy), with both devices working together in an AC-coupled topology. This approach allows you to expand the system in stages without replacing the existing installation. ### What manufacturer's warranty does SMA offer on the Sunny Island series? SMA provides a standard manufacturer's warranty of 10 years on the Sunny Island series. This is one of the longest standard warranty periods in the battery inverter class. It is advisable to register the device through SMA's service portal, as this may be required to activate the full warranty and simplifies any future service requests. ### Does the SMA Sunny Island function as a UPS backup power supply in the event of a grid outage? Yes, this is one of the key features of the series. The Sunny Island is capable of independently forming an AC island grid and, in the event of a utility grid failure, automatically switches connected loads to battery power. It operates both in off-grid mode and as a backup in on-grid installations, making it a suitable choice for homes and facilities that require continuous power supply. ### What battery types is the SMA Sunny Island compatible with? The Sunny Island is compatible with 48 V low-voltage battery storage systems. It supports both conventional lead-acid batteries and more than 20 certified lithium-ion models (including LiFePO4 and others) from reputable suppliers approved by SMA. Before purchasing a battery, it is worth checking the current compatibility list on the sma-solar.pl website, as it is updated on an ongoing basis. ### Is the SMA Sunny Island compatible with a generator or genset? Yes, the Sunny Island has built-in support for generators and gensets. The inverter can automatically start the generator when the battery state of charge drops to a defined threshold, and shut it down once the batteries are sufficiently recharged. This is particularly important in off-grid installations in locations without grid access, or as an additional safeguard during extended grid outages. ### How much does an SMA Sunny Island inverter cost, and what does a typical installation include? Retail prices for the Sunny Island series in Poland range approximately from PLN 10,200 gross (model 4.4M) to PLN 12,800 gross (model 8.0H). A complete off-grid or hybrid installation also requires a 48 V battery bank, a PV inverter with MPPT, a grid/island transfer switch (approx. PLN 1,100 gross), cabling, and labor. The total system cost depends heavily on the storage capacity and PV array size. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/inverters/si44m-80h-13-ds-en-40-9168e85696a2.pdf) ## Alternatives | Inverter | Rated AC | Euro efficiency | MPPT | Weight | Difference | | --- | --- | --- | --- | --- | --- | | [Easun Power ISolar SPL 4K](https://comparepv.com/inverter/easun-power-isolar-spl-4k) | 3.2 kW | | | 9.8 kg | 34.2 kg lighter | | [Growatt SPF 3500 ES](https://comparepv.com/inverter/growatt-spf-3500-es) | 3.5 kW | | 1 | 11.5 kg | +0.2 kW, 32.5 kg lighter | | [Easun Power ISolar SMR II 3.5KW](https://comparepv.com/inverter/easun-power-isolar-smr-ii-3-5kw) | 3.5 kW | | | 11.5 kg | +0.2 kW, 32.5 kg lighter | | [Easun Power ISolar MLV 3.5KW-U](https://comparepv.com/inverter/easun-power-isolar-mlv-3-5kw-u) | 3.5 kW | | | 10.0 kg | +0.2 kW, 34.0 kg lighter | | [Growatt SPF 3000 ES](https://comparepv.com/inverter/growatt-spf-3000-es) | 3 kW | | 1 | 11.5 kg | -0.3 kW, 32.5 kg lighter | | [Growatt SPF 3000TL HVM-24](https://comparepv.com/inverter/growatt-spf-3000tl-hvm-24) | 3 kW | | | 8.5 kg | -0.3 kW, 35.5 kg lighter | | [Growatt SPF 3000TL HVM-48](https://comparepv.com/inverter/growatt-spf-3000tl-hvm-48) | 3 kW | | | 8.5 kg | -0.3 kW, 35.5 kg lighter | | [Growatt SPF 3000TL LVM-ES](https://comparepv.com/inverter/growatt-spf-3000tl-lvm-es) | 3 kW | | 1 | 12.0 kg | -0.3 kW, 32.0 kg lighter | --- Source: https://comparepv.com/inverter/sma-solar-si4-4m-13