Deye SUN-25K-SG01HP3-EU (25 kW) - three-phase hybrid inverter, high-voltage battery

Twenty-five kilowatts: the ceiling of the wall-mounted housing

The SUN-25K-SG01HP3-EU is the most powerful model of the HP3 line that still fits the same 408 by 638 by 237 mm wall housing weighing 30.5 kg. Twenty-five kilowatts give about 8.3 kW per phase, already the level of light manufacturing: a joinery with several machines, a bakery with mixers and ovens, a cheese dairy, a farm with a milking parlour and cold stores, a workshop with compressors, a hotel with a laundry and kitchen. For a private house this power is almost always excessive — the exception being large estates running a pool, a sauna, a heat pump and irrigation simultaneously. The entry condition is the same as for the rest of HP3: a high-voltage battery of 160 to 700 V and the Deye HVB750V/100A control box (item 2099); 48 V modules do not work here. If the site is larger, the catalogue offers the SUN-30K-SG01HP3-EU-BM3 (item 2074), though that comes in a different 80 kg housing.

A 625 V threshold: the longest strings in the catalogue

The overall MPPT window is 150 to 850 V, yet full power is delivered only from 625 V upward — the highest bar among all hybrids here. In practice that calls for a string of sixteen to eighteen modern modules in series: unrealistic on a small roof, but an entirely ordinary configuration on an industrial flat roof, a parking canopy or a ground-mounted station. The reason for the design: at high voltage the same tracker current carries more power, so 26 A per input suffices for a 32.5 kW array. If the strings come out shorter the inverter still works, but peak output shifts down in proportion to voltage — at 400 V that means roughly 16 kW from the array instead of 25. Maximum input voltage is 1000 V, start-up 180 V and rated PV voltage 600 V; with sixteen to eighteen modules per string, winter open-circuit voltage must be checked, because it can approach the 1000 V limit.

50 A of battery current: more than the smaller HP3 units

Charge and discharge current here is 50 A instead of the 37 A found on models up to 20 kW, which follows logically: twenty-five kilowatts from storage demand either higher voltage or more current. At 500 V those 50 A give exactly 25 kW, the inverter's full rating, while at 400 V they yield about 20 kW. The optimal bank therefore starts at ten 51.2 V modules: a BOS-G50 (item 1960) at 512 V system voltage or a BOS-G60 (item 1962) at 614.4 V covers the task completely. For large sites modular GB-L or BOS-GM cabinets are often chosen, where the module count is selected for the voltage needed rather than for capacity alone. The 2099 control box is rated 100 A nominal and 125 A maximum, so for 50 A it has double headroom and can serve a cluster with two parallel groups.

A 32.5 kW array on two trackers

The photovoltaic side consists of two symmetric MPPTs at 26 A of operating current with two strings each and short-circuit current up to 39 A per input. Four long strings carry 32.5 kW precisely because of the high voltage: at 700 V at the operating point, one string at 26 A delivers over 18 kW, and current stops being the constraint. Array oversizing relative to the rating is 30 %, standard for the line and intended for winter months and overcast weather. Tracking efficiency is 99.9 %, maximum efficiency 97.6 % and the European figure 97 %. A practical note for large arrays: with four strings of sixteen to eighteen modules the total DC cable length becomes substantial, and that is the easiest place to lose a few per cent of yield, so cross-section and routing are planned together with the panel layout.

37.9 A per phase at the output and 80 A of transit

Rated output current is 37.9 A per phase at 220 V and 36.3 A at 230 V with a maximum of 39.4 A: the backup line uses 16 mm² cable with a 50 A per phase breaker, and terminals are torqued to specification. Grid transit is 80 A per phase, over 50 kW, so the inverter can sit on the site's entire service: during an outage the facility transfers completely, with no split into critical and non-critical lines. Apparent power is 26 kW, and in island mode the model holds one and a half times its rating, about 37 kW for ten seconds — enough for direct-on-line starting of a 10 to 12 kW motor. Harmonic distortion stays below 3 %, so CNC machines, variable frequency drives and industrial controls run without complaint. A generator input is present, and for a site of this class it is effectively mandatory: twenty-five kilowatts of load will drain any cabinet within a few hours.

Mounting, cooling, protection

Twenty-five kilowatts in a wall housing at 30.5 kg is the headline argument for high-voltage architecture: an inverter of this rating in low-voltage form would weigh 70 to 80 kg and need a hoist. Cooling is intelligent with typical noise up to 55 dB — quiet for an industrial space, still too much for a living area. Protection is IP65, the operating range -40 to +60 °C with derating above +45 °C, mounting is on the wall and the PV side uses MC4 connectors. Protections are standard for Deye hybrids: earth-fault monitoring, grid monitoring, DC reverse-polarity protection, short-circuit protection and an all-pole sensitive residual current monitoring unit. The BMS link runs over RS485 or CAN with self-adaptation; in a high-voltage system watching cluster voltage has practical value, because it determines whether you actually get the nameplate twenty-five kilowatts.

How it differs from its neighbours in this catalogue

The smaller SUN-20K-SG01HP3-EU-AM2 (item 2070) shares this housing and these trackers but has 37 A of battery current, a 26 kW array and a gentler 500 V full-load threshold — in practice shorter strings and a cheaper battery for slightly less power. The larger SUN-30K-SG01HP3-EU-BM3 (item 2074) goes further: three 36 A trackers, a 39 kW array, two 50+50 A battery inputs, 200 A of transit and a battery range to 800 V, but 80 kg of mass and noise up to 65 dB. There is no low-voltage alternative at 25 kW in this catalogue — the nearest is the SUN-20K-SG05LP3-EU-SM2 (item 2056) with a 48 V battery at 350 A, five kilowatts less and a noticeably heavier power installation. Choosing between the 2070 and the 2075 comes down to one question: does your roof accommodate strings of sixteen to eighteen modules, and will the cluster reach 500 V or more. If yes, this model delivers 25 % more power in the very same housing.

Send us your array layout and the high-voltage cabinet you plan, and we will check whether the strings meet the 625 V threshold and the cluster reaches the voltage required.