The SolarEdge 20,000W Three-Phase Inverter M4 Basic (MPN SE20K-RW00IBNM4) is a commercial-grade, SetApp-only string inverter designed for three-phase grid-connected solar PV systems from small commercial rooftops through to educational, municipal, agri-PV, and carport installations. Rated at 20 kW AC output with a 30 kW maximum DC input, it uses the same fixed-voltage DC bus architecture as the full SolarEdge commercial inverter range (SE12.5K–SE33.3K), delivering up to 97.7% peak efficiency. There is no physical display – all commissioning, diagnostics, and configuration are carried out via the SolarEdge SetApp smartphone application over the inverter’s own Wi-Fi access point. This is a Basic variant: it has no built-in MPPT trackers and must be used with SolarEdge Power Optimisers. Integrated Type 2 DC surge protection and arc fault detection are included as standard, and the inverter is G99-certified for UK grid connection.
🔴 Commercial installation & G99 grid-connection requirements
At 20 kW AC, this inverter requires a G99 application to and approval from the DNO before it may be energised – this is not a simple G98 notification. Installation must be carried out by a qualified electrical engineer competent in commercial PV. The firmware must be updated during commissioning via SetApp; SolarEdge requires this explicitly in the installation documentation. The inverter is G99-certified (cert U23-0680, issued by Bureau Veritas under ER G99/1-9:2022) but the DNO pre-approval process must be completed first. Plan DNO application timescales into your project programme.
🔴 No display – SetApp is mandatory for all configuration
This is a Basic “no display” variant. There is no LCD, LED status display, or keypad on the unit. All commissioning, firmware updates, fault codes, and configuration changes must be performed using the SolarEdge SetApp mobile application. Installers must have a compatible smartphone and the SetApp installed before attending site. Post-installation monitoring is via the SolarEdge monitoring platform accessed through Ethernet or optional Wi-Fi.
🟠 Power Optimisers are mandatory – not optional
The M4 Basic has no built-in MPPT trackers. Solar panels cannot be connected directly to this inverter – it will not function without a full SolarEdge Power Optimiser array providing conditioned, fixed-voltage DC. Design the system with appropriate SolarEdge optimisers on every panel. Confirm string design within SolarEdge’s published design guidelines for the SE20K before submitting a G99 application.
💚 150% DC oversizing for maximum commercial yield
The SE20K-RW00IBNM4 supports a maximum DC input of 30 kW against a 20 kW AC output – a 150% DC-to-AC ratio. Oversizing the array relative to inverter AC capacity is standard commercial PV practice in the UK, capturing more energy during low-irradiance morning and evening periods when the inverter would otherwise be running well below rated output. SolarEdge’s fixed-voltage architecture handles array clipping gracefully without the thermal stress that affects conventional string inverters under the same conditions.
Key Features
Fixed-Voltage Architecture for Longer Strings
The DC bus runs at a fixed, stable voltage supplied by the Power Optimiser array rather than tracking the native panel voltage. This means the inverter always operates at its optimal design point, enabling significantly longer strings than a conventional MPPT inverter of the same rating and delivering consistently high efficiency across a full commercial array.
Integrated Type 2 DC Surge Protection
Built-in Type 2 DC SPD protects the DC wiring and inverter electronics from voltage surges caused by lightning strikes or switching events on or near the site. This eliminates the need for a separate external DC surge protection device in the design, reducing BOM cost and simplifying the combiner arrangement on larger commercial rooftops.
Arc Fault Protection
Integrated arc fault circuit detection monitors the DC side continuously for the electrical signature of a developing arc fault – one of the leading causes of PV-related fires in commercial installations. Detecting an arc before it escalates means the inverter can trip safely and alert the monitoring platform, rather than allowing a potential ignition source to persist undetected.
Module-Level Monitoring at Scale
When paired with SolarEdge optimisers, the SE20K provides real-time, per-panel performance data for every module in the array via the SolarEdge monitoring platform. On a 60–100 panel commercial system, this transforms fault-finding from a half-day site visit into a remote diagnostic review, allowing underperforming strings or panels to be identified and prioritised before they materially impact yield.
Smart Energy Management & Export Limiting
Supports export limitation and smart energy management natively, working with a SolarEdge Meter to cap export to whatever the DNO has specified in the G99 approval. This is particularly important for commercial sites where the consented export level may be less than the inverter’s rated output.
Compact & Lightest in Class
At 32 kg, the SE20K is described by SolarEdge as among the lightest in its power class, reducing the structural demand on the mounting surface and making single-person handling more practical during installation. Despite the compact enclosure, it is IP65-rated for outdoor mounting on a plant room wall, in a weatherproof enclosure, or beneath a canopy.
Technical Specifications
Specifications compiled from SolarEdge authorised distributor datasheets and the G99 compliance certificate (ref. U23-0680). For the full SolarEdge commercial three-phase inverter datasheet, refer to the SolarEdge Knowledge Center.
| AC Output |
| Rated AC Power Output |
20,000 W (20 kW) |
| AC Output Voltage (L-L / L-N nominal) |
380/220 V – 400/230 V |
| AC Frequency |
50 Hz (60 Hz configurable) |
| Grid Type |
Three-Phase 3/N/PE (WYE with neutral) |
| DC Input |
| Maximum DC Input Power |
30,000 W (150% DC oversizing) |
| MPP DC Voltage Range |
680 – 1000 Vdc |
| Maximum Input Voltage |
1000 Vdc |
| DC Inputs |
4 (MC4 connectors) |
| MPPT Trackers |
None – Power Optimisers required |
| Efficiency |
| Maximum Efficiency |
97.7% |
| Installation & Mechanical |
| Weight |
32 kg |
| Protection Rating |
IP65 (outdoor and indoor) |
| Surge Protection |
Integrated Type 2 DC SPD |
| Arc Fault Protection |
Integrated |
| Communication & Commissioning |
| Display |
None – SetApp only |
| Commissioning Method |
SolarEdge SetApp via built-in Wi-Fi AP |
| Communication |
Ethernet, RS485; Wi-Fi / Cellular optional |
| Smart Energy Management |
Export limiting, device control |
| Compliance & Certification |
| UK Grid Standard |
G99 certified (cert. U23-0680, ER G99/1-9:2022) |
| Safety |
IEC 62109-1/2 |
| RoHS |
Compliant |
| Manufacturer Part Number |
SE20K-RW00IBNM4 |
Mechanical dimensions for the SE20K-RW00IBNM4 could not be confirmed from matching primary sources. Refer to the SolarEdge Commercial Three-Phase Inverter datasheet (available in the SolarEdge Knowledge Center) for the authoritative installation dimensions before wall bracket placement. Efficiency figure of 97.7% from SolarTraders product listing; rounded to 98% in some SolarEdge marketing materials.
Frequently Asked Questions
Why does this inverter have “Basic” and “No Display” in the name?
“Basic” indicates this is the standard commercial-grade variant without an integrated display screen or connectivity accessories – as opposed to premium variants that may include a built-in display, additional communication modules, or battery-ready functionality. “No Display” reinforces that there is no physical LCD or LED readout: all configuration and diagnostics are done entirely through the SolarEdge SetApp smartphone application via the inverter’s built-in Wi-Fi access point.
Do I need a SolarEdge Meter with this inverter?
Yes, in most commercial UK G99 scenarios. The DNO’s G99 approval will typically specify an export cap, which requires a revenue-grade SolarEdge Meter connected via RS485 to enable the inverter’s export-limitation function. Without a meter, the inverter cannot enforce an export limit. In some arrangements a site meter is acceptable – confirm with your DNO and SolarEdge design tools before finalising the BOM.
What DC input voltage range does it support?
The MPP DC voltage range is 680–1000 Vdc (from the G99 compliance certificate). The maximum allowable DC input voltage is 1000 Vdc. String design must be validated so that worst-case open-circuit voltage (at minimum expected temperature) does not exceed 1000 Vdc. Use the SolarEdge Designer or a string sizing tool with site-specific temperature data to verify.
Is the Type 2 DC surge protection built in, or does it need to be added separately?
Built in as standard on the SE20K-RW00IBNM4. The “DC SPD” in the distributor name confirms this. Type 2 DC surge protection is included within the inverter enclosure, providing protection against indirect lightning surges on the DC string cabling without needing a separate external SPD device in the DC combiner or string box.
How does it handle shading on a large commercial array?
Because each panel in the array has its own SolarEdge Power Optimiser performing module-level MPPT, shading, soiling, or mismatch on any individual panel affects only that panel’s output, not the rest of the string. The fixed-voltage DC bus means the inverter continues to operate at its design efficiency regardless. On a commercial installation with regular shadow from roof plant, parapets, or neighbouring buildings, this can meaningfully increase annual yield compared with a conventional string inverter without optimisers.
What is the warranty on the SE20K-RW00IBNM4?
SolarEdge commercial inverters carry a 12-year standard warranty from date of installation, with extended warranty options available (typically up to 20 or 25 years) purchasable at the time of installation. Warranty terms require the unit to be registered with SolarEdge and installed in accordance with the official installation guide. Refer to the SolarEdge warranty document for full terms, exclusions, and regional conditions.
