Deye SUN-20K-SG01HP3-EU-AM2 (20 kW) - three-phase hybrid inverter, high-voltage battery

Twenty kilowatts in a thirty-kilogram housing

The SUN-20K-SG01HP3-EU-AM2 shows what high-voltage architecture buys you: twenty three-phase kilowatts in a 408 by 638 by 237 mm case weighing 30.5 kg, half the mass of a low-voltage equivalent at the same rating. Sites for this model: a farm with several pumps and cold rooms, light manufacturing, a hotel, a service station, a greenhouse complex, a large estate with a pool and a heat pump. Twenty kilowatts give about 6.7 kW per phase, enough for several medium three-phase motors running together plus the full domestic set. The entry condition is a high-voltage battery: BOS-G, BOS-GM or GB-L cabinets rated 160 to 700 V and the mandatory Deye HVB750V/100A control box (item 2099). Low-voltage 51.2 V modules cannot be connected here, and that is not a settings question but a different class of equipment.

A 500 V threshold: the strictest array requirement in the line

The overall MPPT window is 150 to 850 V, but full power is delivered only within 500 to 850 V, and that is the key design consideration. In practice it means a string of thirteen to sixteen modern modules in series: a shorter row will work, yet twenty kilowatts from the array will not materialise, because output becomes limited by tracker current. By comparison, the smaller twelve-kilowatt version has a 340 V threshold, nine or ten panels, while the twenty-five-kilowatt one demands 625 V. The trackers here are symmetric: two MPPTs at 26 A of operating current with two strings each and short-circuit current up to 39 A per input. Up to 26 kW of panels can be connected against the 20 kW rating — the 30 % oversizing intended for winter — with a 1000 V maximum input and a rated PV voltage of 600 V.

37 A of battery current: twenty kilowatts need a high cluster voltage

Battery charge and discharge current is 37 A, and on a high-voltage bus that is not a limitation but a consequence of the architecture: voltage sets the power. To draw the full twenty kilowatts from storage the cluster needs around 540 V or more, meaning eleven or twelve 51.2 V modules: a BOS-G55 (item 1961) at 563.2 V or a BOS-G60 (item 1962) at 614.4 V fit that description. A 400 V bank yields roughly 15 kW — the inverter still works, but it reaches full output only from the panels and the grid. This is the most important calculation when specifying the system: capacity in kilowatt-hours is secondary here, while the number of modules in series is decisive. The battery range is 160 to 700 V, lithium-ion only, and usable capacity in BOS-G cabinets is about 10 % below nominal at 90 % depth of discharge.

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

Rated output current is 30.4 A per phase at 220 V and 29 A at 230 V with a maximum of 33.4 A: the backup line takes 10 mm² cable with a 40 A per phase breaker. Grid transit is 80 A per phase, over 50 kW, so the site's entire service can run through the inverter rather than just a backup circuit. Apparent power is 22 kW, and in island mode the model holds one and a half times its rating — about 30 kW for ten seconds. For three-phase motors that permits direct-on-line starting of 7 to 10 kW units, while anything larger deserves a soft starter or a variable frequency drive. Harmonic distortion stays below 3 %, so industrial controls, drives and server equipment run without isolating transformers.

Generators and the logic of long outages

A generator input is built into the design: the inverter synchronises with the set, feeds the site from it and simultaneously charges the high-voltage battery through that same 37 A channel. For a twenty-kilowatt site that matters: during an eight to twelve hour winter outage even a 40 to 60 kWh cabinet will not carry a production facility's full load, so the generator becomes the main source and the inverter the buffer that smooths the starts. Generator charging current is limited in the settings, otherwise the inverter will try to take its maximum and overload the set — at 37 A that is roughly 15 to 20 kW of charging at high cluster voltage. Scheduled grid charging lets storage be prepared for a known outage timetable. In this model the priorities for consumption, charging and export are configurable by the hour, so the system can be tuned both for a feed-in tariff and for blackouts.

Mounting, cooling, protection

Thirty kilograms and wall mounting are the main installation advantage of the HP3 line: a twenty-kilowatt inverter goes up with two people and no lifting gear, which saves both time and money on site. Cooling is intelligent, typical noise is up to 55 dB, protection is IP65 and the operating range runs from -40 to +60 °C with derating above +45 °C. Panels connect through MC4 connectors, and four strings mean eight pairs, so a cable tray or conduit is better planned in advance. The protection set is complete: earth-fault monitoring, grid monitoring, DC reverse-polarity protection, short-circuit protection and an all-pole sensitive residual current monitoring unit. The battery BMS link runs over RS485 or CAN with self-adaptation — in a high-voltage system it is the BMS that authorises charging and commands the 2099 box contactor.

How it differs from its neighbours in this catalogue

The larger SUN-25K-SG01HP3-EU (item 2075) shares these trackers and housing but offers 25 kW, a 32.5 kW array and 50 A of battery current instead of 37 — though its full-load threshold is 625 V, so strings must be longer still. The smaller SUN-15K-SG01HP3-EU-AM2 (item 2058) has asymmetric 26+20 A trackers, a 19.5 kW array and a gentler 420 V threshold. The direct low-voltage alternative is the SUN-20K-SG05LP3-EU-SM2 (item 2056): the same rating, but a 48 V battery at 350 A, an array of up to 40 kW, a double peak and 51.9 kg of mass; cheaper batteries there, but a far heavier power installation. For the largest sites the line offers the SUN-30K-SG01HP3-EU-BM3 (item 2074) with three trackers, two 50+50 A battery inputs and 200 A of transit. Choosing within HP3 comes down to two numbers: your cluster voltage and the string length your roof can hold.

Tell us how many modules your high-voltage cabinet will hold and how many panels each string contains, and we will check whether this model can reach its full twenty kilowatts.