Deye SUN-30K-G04 (30 kW) - three-phase grid-tie inverter

Thirty kilowatts and six strings for a complicated roof

The SUN-30K-G04 feeds 30 kW into a three-phase grid and accepts an array of up to 39 kW spread across six strings — three on each of its two MPPT trackers. That combination is uncommon: most inverters of this rating offer two strings per tracker, which forces panels into long identical rows. Here the array can be split into six rows of differing length, provided the strings sharing one tracker have similar orientation and tilt. For the complicated geometry of Ukrainian private roofs — hipped shapes, dormer windows, extensions — that flexibility often matters more than extra kilowatts. The unit is grid-tie only: it has no battery and shuts down together with the grid during an outage, so it is bought for economics rather than for backup.

Forty amps per tracker: full power from only 375 volts

Each tracker takes 40 A of operating current at a 60 A short-circuit rating, so together the unit can draw 80 A of DC. From that follows the key practical figure: to deliver 30 kW the array only needs about 375 V, noticeably less than the roughly 480 V required by the smaller SUN-25K-G05 (item 2049). In practice this gives freedom in string length: rows of ten to twelve modules still reach the full rating on a clear day. The MPP range of 200 to 850 V with a 250 V start voltage lets the inverter wake up early, at first light, when the array barely exceeds a quarter of a kilovolt. The 40 A rating also leaves headroom to parallel three modern high-current strings of 13–14 A each without any current clipping.

Forty-four kilograms: the installation needs planning

The housing measures 647.5 × 537 × 303.5 mm and weighs 44.5 kg — twice as much as the smaller models in the series and already at the limit of what two installers can lift to chest height by hand. The wall must be load-bearing: plasterboard, aerated block without inserts or a thin partition will not hold this unit over time, so concrete, solid brick or a steel frame is required. A width of almost seventy centimetres demands that the space be planned in advance, especially when a protection board, a meter and a DC isolator stand alongside. The weight comes from physics rather than over-engineering: power chokes and heatsinks for 30 kW simply cannot be light with this cooling concept. In return, the massive heatsink holds temperature better in a heatwave, so the unit takes longer to reach thermal power limiting.

Up to 50 dB of noise and the choice of location

Typical noise is declared below 50 dB, roughly the level of a normal conversation held next to you. For a plant room, a garage or a separate outbuilding that is irrelevant, but hanging this inverter on a bedroom wall or in a residential corridor is a poor idea. Cooling is intelligent: the fans are driven by temperature, so the unit is quiet on cloudy days and early mornings, and full volume appears only at summer midday. IP65 protection and tolerance of up to 100 % humidity without condensation allow outdoor installation under a canopy or on a shaded wall. The same rule applies as to the rest of the series: keep direct sun off the case, because a hot inverter starts cutting power exactly when the panels are giving the most.

Forty-six amps per phase: cable, breaker and contract

Rated output current is 45.5 A per phase at 380 V and 43.5 A at 400 V, with a 50 A maximum, so the line is normally designed around a three-phase 63 A breaker and 16 mm² copper cable. This is no longer domestic wiring: the run from inverter to switchboard must be checked for voltage drop, and beyond thirty metres the cross-section will most likely need increasing. Thirty kilowatts sits at the edge of the private household ceiling in Ukraine, which is 30 kW and in practice is capped by the connected capacity in your utility contract. The typical site for this model is a small production unit, a farm, a car wash, a hotel or a service station with a 30–50 kW three-phase connection and heavy daytime consumption. Certification to VDE4105, IEC61727/62116, AS4777.2 and CEI 0-21 covers the requirements for generating equipment, so approval depends on the connection capacity rather than on the hardware.

98.7 % efficiency and what the 98 % European figure means

Peak efficiency of 98.7 % is reached near half load at high array voltage, while the European weighted figure of 98 % describes a real year of mornings, clouds and partial load. For a 39 kW array producing around 40 MWh a year in central Ukraine, every tenth of a percent of efficiency is worth roughly 40 kWh, which adds up to several hundred kilowatt-hours over five years. MPPT efficiency above 99 % means the algorithm keeps up with fast-moving cloud and does not lose the generation peaks. Night-time consumption below 1 W barely registers in the balance, amounting to under ten kilowatt-hours a year. Harmonic distortion below 3 % guarantees a clean sine wave, which matters on sites running variable-frequency drives, compressors and other sensitive loads.

Monitoring: a 240 × 160 display and six separate curves

The case carries a 240 × 160 pixel graphic display rather than the two-line text panel of the smaller models, so daily figures can be read without a phone. Over Wi-Fi, LAN, RS485 or RS232 the unit uploads data to the cloud, where each of the six strings has its own current and voltage curve. Those separate curves are what make diagnosis simple: if one row sits twenty percent below a neighbour with the same orientation, there is a dirty panel, shade from a newly grown tree or a failing connector. Ground fault monitoring and grid parameter supervision run continuously, and the event log preserves the reason for every disconnection. For a site with commercial loads this is not a luxury: a week of lost generation from an unnoticed broken string costs more than the hour spent setting monitoring up.

How it differs from its neighbours in this catalogue

The smaller SUN-25K-G05 (item 2049) offers 25 kW on just four strings, but weighs 20 kg, stays under 40 dB and works up to four thousand metres — it suits a simple roof with long rows. The larger SUN-35K-G04 (item 2065) uses the same housing and the same 44.5 kg, yet adds a third 40 A tracker and an array of up to 45.5 kW, giving more output for identical installation effort. The SUN-60K-G (item 2066), with four trackers and a 78 kW array, is already commercial plant territory with a dedicated switchroom. If the panels fall into two or three long rows, the extra strings will never be used and the choice should follow the available connection capacity. And if power during outages is required, the G series must be excluded in favour of the three-phase LP3 and SM2 hybrids or the high-voltage HP3 models.

Send us a roof plan with the orientation of each plane together with your connection contract, and we will work out whether your array fits six strings and whether the larger model in the same housing is the better buy.