Huawei SUN2000-4KTL-L1 single-phase hybrid inverter, 4kW

The panels produce direct current, which no socket in the house can use as such; the inverter converts it into alternating current and decides where the energy goes — to the loads, into the battery or into the grid. This model is a hybrid, so it can connect a battery directly and shift the energy produced during the day towards the evening consumption. It is installed on a single-phase connection, the usual one in homes, and is cooled by natural convection, without fans, so it runs silently.

With 4.000 W rated power it covers the simultaneous consumption of an average house and accepts up to 6.000 Wp of panels, that is a ratio of 1,5 between the panels and the output power — a common configuration for gable roofs or roofs with partial shading, where the two MPPTs work independently of each other. Coupled to a Huawei LUNA2000 battery, it charges it with up to 5.000 W and discharges it with up to 4.400 W, without additional conversion equipment. It weighs 12 kg, measures 365 x 375 x 156 mm and has an IP65 enclosure, so it can also sit on an outside wall. Production, consumption and battery status are tracked from the FusionSolar app, and maintenance comes down to a periodic visual check.

4.000 W rated active power, 4.400 VA apparent, 20 A maximum output current on 220/230/240 V single-phase, THD below 3%, maximum efficiency 98,4% and European weighted 97,5%. DC: 2 independent MPPTs, 600 V maximum input voltage, MPPT range 90-560 V, 12,5 A per MPPT, 6.000 Wp maximum recommended PV power. Integrated battery interface 350-560 V DC for LUNA2000, 5.000 W charging / 4.400 W discharging; IP65 enclosure, natural convection cooling, 12 kg, 365 x 375 x 156 mm, RS485 communication and Smart Dongle WLAN/Ethernet or 4G, string-level monitoring in FusionSolar.

Who it suits

Suitable for a house with a single-phase connection and a 4-6 kWp system, especially if the roof has two orientations or if you want storage for the evening consumption.

Terms explained

• MPPT: The circuit that seeks the maximum power point of the panel string; two MPPTs allow two groups of panels with different orientations, without one dragging the other down.
• DC/AC ratio (oversizing): You can install more watts of panels than the inverter's power, because the panels rarely reach their maximum value; here, 6.000 Wp on a 4.000 W inverter.
• Natural convection: The device is cooled by air alone, without fans, so it makes no noise and has no moving parts that could fail.

Technical specifications

Recommended applications

• Single-phase residential photovoltaic systems of 4-6 kWp
• Self-consumption with storage in a Huawei LUNA2000 battery
• Roofs with two orientations, served by the two independent MPPTs
• Systems prepared for back-up of critical loads

Warranty

10-year product warranty (Huawei standard for the European market)

Technical details

Specifications confirmed from the manufacturer's datasheet

SUN2000-4KTL-L1 is the 4 kW version of Huawei's L1 single-phase residential series. It delivers 4.000 W rated AC power and 4.400 VA maximum apparent power on a 220/230/240 V grid, with a maximum output current of 20 A. Maximum efficiency is 98,4% and the European weighted efficiency 97,5%, with THD below 3%.

The DC input is organised on two independent MPPTs, with a maximum voltage of 600 V and an operating range of 90-560 V, 12,5 A per MPPT. The maximum recommended photovoltaic power is 6.000 Wp, so it allows a DC/AC ratio of 1,5 - a common configuration for roofs with two orientations or with partial shading, where the two MPPTs work independently.

The integrated battery interface accepts 350-560 V DC, with 5.000 W maximum charging power and 4.400 W maximum discharging power, for the direct coupling of Huawei LUNA2000 batteries. The inverter manages self-consumption, battery charging/discharging and grid injection without additional DC-DC conversion equipment.

The enclosure is identical to the rest of the L1 series: 365 x 375 x 156 mm, 12 kg, IP65, natural convection cooling. Communication is via RS485 and Smart Dongle WLAN/Ethernet or 4G, with string-level monitoring in the FusionSolar platform.