Inverters

SMA Sunny Island X

£ 9,280GBP · price may vary

Model: SI-30-20
Specifications: 13

Power Rating30000W
PhasesThree Phase
ConnectivityEthernet, WiFi
Height837.3
Width772
View all 13 specifications ↓

Overview

The SMA Sunny Island X 30kW and 50kW represent their next generation of battery inverters. Suitable for multiple applications on-grid and off-grid the SMA Sunny Island X is extremely versatile. Utilise SMA's Sunny Design design tool or contact us for support designing your system. Applications On-grid Small to large scale on-grid systems Self-consumption optimisation Peak load shaving Multi-use Off-grid (requires additional Sunny Island X Connection Box) Large scale off-grid system Features 30kW and 50kW nominal output versions, full rating even at high temperatures (45°C) 3-phase Modular scalability of AC power and battery capacity in on and off-grid installations Compatible with numerous approved batteries thanks to integrated DC-to-DC converter Flexible use of generators or the utility grid in off-grid installations using additional Sunny Island X Connection Box Developed in Germany to 100% SMA quality standards Made in Germany 10-year warranty (5 + 5*) Integrated energy management in on-grid installations without battery backup Compatible with SMA Hybrid Controller or other Modbus system controllers in off-grid installations Comprehensive system monitoring thanks to Sunny Portal powered by ennexOS

Specifications

Power Rating	30000W
Phases	Three Phase
Connectivity	Ethernet, WiFi
Height	837.3
Width	772
Depth	443.8
Weight (kg)	104
Warranty	10 Years*
Certification	G99
IP Rating	IP65
On Grid / Off Grid	On Grid, Off Grid
Backup Compatibility	Yes*
Lithium Compatibility	Yes

What these specifications mean

SMA Sunny Island X is listed with 13 published specifications from SMA, including power rating of 30000W, phases of Three Phase, connectivity of Ethernet, WiFi and height of 837.3. Those figures are what decide whether this unit fits your system, so read them against the equipment it will connect to before comparing price.

For an inverter, the figures that matter most are surge or peak rating, which covers the brief inrush of motors and compressors, maximum PV input and the number of MPPT trackers, which set how many panel strings you can connect, the MPPT voltage window, which decides how many panels go in a string and peak and weighted (European/CEC) efficiency, typically 96–98.5%. It is the component that decides what a solar system can do: how much power you can draw at once, whether you can export to the grid, whether the system keeps running in a blackout, and how well the panels and battery are managed day to day.

Before you buy an inverter

The checks below apply to any inverter. Run them against the specification table above — most disappointing solar purchases are compatible-on-paper units that fail one of these in practice.

Confirm the inverter is approved by your local utility or distribution network before you buy if you intend to export power — grid connection depends on certified anti-islanding and local grid-code compliance, not on the inverter's specifications alone.
Match the battery communication protocol (CAN bus or RS485) between inverter and battery. Compatible voltages are not enough; without a supported protocol the battery management system and inverter cannot agree on charge limits.
Look at the warranty term and what it covers. Five years is the common baseline, ten is offered by stronger brands, and extensions are often cheaper bought with the unit than later.
Size the inverter against the loads you need to run simultaneously, not against the total wattage of every appliance in the building — a 5 kW inverter comfortably runs a fridge, fans, lights and a couple of ACs, but not all of them plus a water pump starting at the same time.

Where buyers lose money

Ignoring the ambient temperature rating. Inverters derate in heat, so a unit rated 5 kW at 25 °C may deliver noticeably less on a hot roof-adjacent wall at 45 °C.
Assuming any grid-tie inverter keeps the lights on during an outage. Standard on-grid units shut down for safety unless they have a dedicated backup or islanding output.
Overlooking the IP rating. An outdoor installation needs at least IP65; indoor-rated units mounted outside fail early.

Price and availability in United Kingdom

SMA Sunny Island X is listed at £ 9,280 (GBP) for United Kingdom. Solar pricing moves with supply, import duties and exchange rates, and distributors set their own margins, so treat this as a comparison reference and confirm the current figure before you order.

SolarBazaar compares equipment rather than selling it. Shortlist here on specification and price, then buy from an authorised distributor or installer in United Kingdom: warranty cover on solar hardware is normally honoured through the channel you bought from, so confirm who supports SMA locally before ordering.

SMA Sunny Island X — frequently asked questions

How much does SMA Sunny Island X cost?

SMA Sunny Island X is listed at £ 9,280 (GBP) for United Kingdom. The figure is indicative — solar prices move with supply, duties and exchange rates, and each distributor sets its own margin — so confirm the current price with a supplier before ordering.

What are the specifications of SMA Sunny Island X?

We hold 13 published specifications for this inverter, including power rating 30000W, phases Three Phase, connectivity Ethernet, WiFi, height 837.3 and width 772. The full table is on this page, listed under model SI-30-20.

Who makes SMA Sunny Island X?

SMA Sunny Island X is a SMA product, listed under inverters with model reference SI-30-20. The SMA brand page lists the rest of its range so you can compare across the catalogue.

Is SMA Sunny Island X right for my system?

That depends on what it has to connect to. For an inverter, check the MPPT voltage window, which decides how many panels go in a string, peak and weighted (European/CEC) efficiency, typically 96–98.5% and topology — on-grid, off-grid, hybrid or micro against the rest of your equipment before price enters the decision. Keep the panel array between roughly 1.0 and 1.3 times the inverter's rating. Slight oversizing (a higher DC-to-AC ratio) captures more energy on cloudy mornings and winter days; going far beyond it wastes generation through clipping.

Where can I buy SMA Sunny Island X in United Kingdom?

SolarBazaar lists and compares equipment rather than selling it. Use the specifications and price here to shortlist, then buy through an authorised distributor or installer in United Kingdom — buying in-channel is what keeps the manufacturer's warranty valid.

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