GoodWe GW15K-SDT-30 - three-phase grid-tied inverter 15 kW.

GoodWe GW15K-SDT-30 is a three-phase grid-tied inverter rated at 15 kW with two MPPT inputs, a maximum input voltage of 1100 V and intelligent cooling. Efficiency 98.5%, nominal output current 21.7 A per phase. IP66, 5-year warranty.

Intelligent cooling instead of natural convection

On the smaller model in the SDT series (8 kW), cooling is passive. In the GW15K-SDT-30 the manufacturer moves to an intelligent system — the fan does not run continuously but switches on only when component temperature genuinely calls for it.

This is a compromise between two approaches. Fully passive cooling is silent but limited in output. A continuously running fan is noisy but removes more heat. An intelligent system takes the best of both: for most of the time the unit runs quietly, and the fan joins in only during peak summer hours.

The practical consequence for the owner is a longer fan life. It does not spin round the clock but engages as needed, so the part that wears works through its service life far more slowly.

Technical specifications

• rated power 15 kW, apparent power 15000 VA, three phases 380/400 V;

• two MPPT inputs, tracking efficiency above 99%;

• MPP range 140–1000 V, maximum input voltage 1100 V;

• efficiency 98.5% peak, 98.2% European weighted;

• output current 21.7 A nominal, 23.9 A maximum;

• start-up voltage 160 V, THD below 3%;

• IP66, intelligent cooling, up to 4000 m, -25 to +60 °C;

• mass 15.1 kg, dimensions 392 × 491 × 210 mm, 5-year warranty.

Fifteen kilowatts of grid-tied generation

For a site with no need for backup, a fifteen-kilowatt grid-tied inverter is a serious station, able to substantially cut the electricity bill of a mid-sized commercial premises or a large private house with a workshop.

Since there is no battery, the entire system cost goes straight into panels and installation. For sites with a stable grid this is the fastest route to payback on every hryvnia invested.

The unit remains fully compatible with adding an AC-coupled storage unit later if the need for backup arises — the already installed part will not need reworking.

Long strings at 1100 volts

A maximum input voltage of 1100 volts allows panels to be connected in longer series strings than hybrid models permit. For a fifteen-kilowatt array this means lower operating current and, correspondingly, thinner and cheaper DC cable.

This is especially noticeable in winter: cold weather raises the panels' open-circuit voltage, and the voltage headroom keeps the system safely under the inverter's limit on a frosty, sunny morning.

IP66 protection class and monitoring

IP66 is a class higher than the typical IP65 of hybrid models: the unit is protected not only from water jets in any direction but also from powerful washdown under pressure. For an inverter frequently mounted on an exposed wall or under a canopy, that is extra reliability margin over decades of operation.

The standard SEMS Portal app shows generation from each MPPT input separately, history over any period and real-time efficiency. Connectivity runs over both Wi-Fi and wired LAN, which matters particularly for switchboards in a basement or a technical room with poor router signal.

For integration with external systems, Modbus TCP and RTU are available — allowing the inverter's readings to be combined with an overall energy metering system on a commercial site.

Fifteen kilowatts of grid-tied generation without paying for a battery — a solution for a stable grid and fast payback. Tell us about your roof area and consumption: we will calculate the string configuration for maximum output power.