Huawei SUN2000-25KTL-M5 Inverter, 25kW on-grid three-phase

Photovoltaic panels produce direct current, a type of current that household appliances cannot use directly. The inverter is the part that converts it into alternating current, exactly like the one in the socket, and synchronises it with the grid. This model is three-phase, meaning it works on connections with three phases, usually used for large houses, workshops and small buildings. It has no fan: it cools itself, by air, so it makes no noise and has fewer parts that can wear out.

It covers installations of up to 37,500 Wp of panels mounted on a 25 kW inverter, which means it can be oversized by up to 1.5 times — a normal practice that helps recover output on cloudy days and in the morning. The 2 MPPT trackers and the 4 inputs allow the panels to be split across two different roof orientations without one dragging the other down. Out of 100 units of energy received from the panels, roughly 98 pass on further, the rest being conversion losses (maximum efficiency 98.4%). The enclosure has IP66 protection, so it can also be mounted outdoors, on a wall, it operates between -25 and +60 degrees C and weighs 21 kg, at 546 x 460 x 241.5 mm. Production is monitored from the FusionSolar platform, including for each individual string of panels, so a fault is spotted quickly.

Rated active power 25,000 W, maximum apparent power 27,500 VA, connection 220/380 V or 230/400 V, 50/60 Hz, maximum output current 39.9 A at 400 V and 42.0 A at 380 V. Maximum efficiency 98.4%, weighted European efficiency 98.2%. DC: maximum voltage 1,100 V, MPPT range 200-1,000 V (530-800 V at full load), 30 A maximum per MPPT in a two-string configuration or 20 A on a single string, 40 A short-circuit current. It includes AFCI, surge arresters on DC and AC, PID recovery and string-level monitoring; RS485 communication, and WLAN/Ethernet or 4G via the optional Smart Dongle. Grid connection certifications: VDE-AR-N 4105, VDE-AR-N 4110, EN 50549, CEI 0-21, C10/11, G99, IEC 61727, IEC 62116.

Who it suits

Suitable for a large house, a workshop or a small office with a three-phase connection and a panel array of 25-37.5 kWp, where outdoor mounting without fan noise is wanted.

Terms explained

• MPPT: A circuit that permanently looks for the point at which the panels deliver the most energy; more MPPTs means you can place panels on different orientations without losing output.
• AFCI: A system that detects the spark (electric arc) appearing at a loosened contact and shuts down the installation before there is any fire risk.
• IP66: The sealing level of the enclosure: fully protected against dust and against powerful water jets, so it can stay mounted outdoors.

Technical specifications

Recommended applications

• High-power residential photovoltaic systems
• Halls, workshops and small farms
• Office buildings and commercial spaces
• Self-consumption with grid injection

Warranty

Standard manufacturer warranty 5 years, with the option of extension

Technical details

Specifications confirmed from the manufacturer's datasheet

Huawei SUN2000-25KTL-M5 is a 25 kW three-phase on-grid string inverter from the M5 series, dedicated to large residential and small commercial installations. It delivers 25,000 W rated active power and 27,500 VA maximum apparent power at 220/380 V or 230/400 V, 50/60 Hz, with a maximum output current of 39.9 A at 400 V (42.0 A at 380 V). Maximum efficiency is 98.4%, and the weighted European efficiency 98.2%.

The DC input supports up to 1,100 V, with 2 independent MPPT trackers and 4 string inputs. The MPPT operating range is 200-1,000 V (530-800 V at full load), the maximum current being 30 A per MPPT in a two-string configuration or 20 A on a single string, with 40 A short-circuit current. The maximum recommended PV power is 37,500 Wp, which allows oversizing of up to 1.5x.

The IP66 enclosure with natural cooling, without a fan, measures 546 x 460 x 241.5 mm and weighs 21 kg, operating between -25 and +60 C. It includes AFCI (active electric arc detection), surge arresters on DC and AC, integrated PID recovery and string-level monitoring. RS485 communication, and WLAN/Ethernet or 4G via the optional Smart Dongle, with monitoring in the FusionSolar platform. Grid connection certifications: VDE-AR-N 4105, VDE-AR-N 4110, EN 50549, CEI 0-21, C10/11, G99, IEC 61727, IEC 62116.