Huawei 300kW 1500V Inverter SUN2000-330KTL-H1

The Huawei SUN2000-330KTL-H1 is a three-phase string inverter for utility-scale and large C&I photovoltaic plants: 300 kW rated and 330 kVA maximum apparent power, DC input up to 1,500 V, 6 MPPTs at 65 A with 28 string inputs and a maximum efficiency of 99.0% (European 98.8%). The feature that drives the whole design is the output: 800 V three-phase without neutral (3W + PE), intended to work behind a dedicated MV/LV transformer, not on an ordinary 400 V grid.

A 1,500 V / 800 V architecture: what changes in the design

The SUN2000-330KTL-H1 is not simply "a bigger rooftop inverter": it belongs to a different plant architecture. On the DC side, the 1,500 V maximum voltage allows strings about 50% longer than 1,000 V systems, which means fewer strings, less DC cable and fewer combiner boxes for the same power. In return, modules, cables, connectors and disconnectors must all be rated for 1,500 V DC: a single 1,000 V component in the chain makes the design non-compliant.

On the AC side, the 800 V output lowers the current to 216.6 A rated (238.2 A maximum) and therefore the AC cable cross-section, but it requires a transformer with an 800 V secondary and a medium-voltage grid connection, with the main and interface protections required by the local grid code installed in the substation. The datasheet declares compliance with EN 50549-2 (generating plants connected to MV distribution networks); any country-specific grid code certificate for the supplied revision should be requested before filing the connection application.

SUN2000-330KTL-H1 technical specifications

There is also a SUN2000-330KTL-H2 variant with the same apparent power but 275 kW rated at 50 °C ambient: the H1 code offered here is the 300 kW rated version. The datasheet does not state night-time consumption or a maximum DC/AC ratio.

The string check you must do: 65 A shared by 4 or 5 strings

The 65 A per MPPT is shared among the tracker's inputs. On the three MPPTs with 5 strings this leaves an average of 13 A per string, on the three with 4 strings about 16.25 A. Large-format bifacial TOPCon modules have maximum power point currents of 13-14 A on the front side alone, plus the rear-side gain: with 5 full strings per MPPT, current clipping around midday is likely. On ground-mounted plants with bifacial modules it is therefore worth checking the real current with the manufacturer's design tool and, if needed, using 4 strings per MPPT even where 5 are allowed.

Frequently asked questions

Can I connect the SUN2000-330KTL-H1 to a 400 V three-phase grid?

No. The output is 800 V phase-to-phase, without neutral (3W + PE). The inverter must be connected to the 800 V secondary of an MV/LV transformer dedicated to the plant: it is a machine for power plants connected at medium voltage, not for low-voltage consumers. Smaller plants, or plants connected at 400 V, need inverters with a 230/400 V output.

How many modules can go in a 1,500 V string?

The maximum is obtained by dividing 1,500 V by the module open-circuit voltage at the site's minimum temperature. For example, a module with a Voc of 49 V at 25 °C and a coefficient of -0.25 %/°C reaches about 53.3 V at -10 °C: at most 28 modules can be connected in series, compared with 18 in a 1,000 V system. The string MPP voltage must also stay above 500 V in the hottest hours.

Are string fuses or a DC combiner box needed?

Strings connect directly to the inverter's 28 inputs, which handle up to 115 A short-circuit current per MPPT and integrate smart string-level disconnection (SSLD) and type II surge arresters on the DC side. DC fuses are not included in the supply. The disconnection and protection devices required by the designer and by the applicable standards for the cable run up to the inverter remain part of the project, all rated for 1,500 V.

How much PV power can I connect to a SUN2000-330KTL-H1?

The datasheet does not state a maximum DC/AC ratio: the real limits are 1,500 V open-circuit voltage, 65 A per MPPT and 115 A short-circuit current per MPPT. Oversizing the array relative to the 300 kW rated power should therefore be checked with Huawei's sizing tool for the specific site, taking into account temperature, bifaciality and the clipping accepted at peak hours.

How is it monitored and connected to the plant SCADA?

The recommended connection is through the Huawei SmartLogger 3000 data logger, via RS485 or via MBUS, which carries data over the AC power cable itself and reduces signal wiring. The 4G dongle is optional and commissioning is done from the app over WLAN. The SmartLogger, sold separately, also handles the active and reactive power commands requested by the grid operator.