Description

The Sungrow SG20RT-P2 is a 20 kW three-phase grid inverter for a farm, workshop, shop or warehouse with a permitted generation capacity of 20 kW. It accepts up to 30 kWp of modules in four strings (two per MPPT) and delivers up to 22 kVA, 31.9 A per phase, into the 3/N/PE 400 V grid. The most powerful model in the series: the same 370 × 480 × 195 mm IP65 enclosure, 22 kg, fan cooling. A battery cannot be connected to this inverter – storage requires a hybrid inverter.

30 kWp on two inputs

Each MPPT accepts up to 32 A (40 A short-circuit) and delivers no more than 15.5 kW, so the inverter reaches its full 20 kW only with modules on both inputs – at least 4.5 kW must fall to the second one. Hence 30 kWp is best split into four similar strings, two per input. The inverter delivers full power at 430–850 V – the highest threshold in the series, so the strings are designed longest; MPPT range 160–1 000 V, maximum voltage 1 100 V (above 1 000 V, MC4 Evo2 connectors are required).

How it differs from the 15 kW model

The enclosure, weight, fan, four strings and 32 A inputs are the same; the AC power (20 vs 15 kW), module power (30 vs 22.5 kWp), output current (31.9 vs 25 A) and full-power threshold (430 vs 380 V) differ. European efficiency 97.9 % for both, maximum 98.3 %. For a system above 30 kWp, several inverters are combined.

Communication and control

The WiNet-S (or WiNet-S2) module in the COM1 port links the inverter to iSolarCloud over Wi-Fi or Ethernet; an LED indicator shows the status. For a single inverter, a DTSU666, DTSU666-20 or DTSD1352-C meter is connected to COM2 (A2/B2). At one point of connection the manufacturer allows up to five inverters: they are daisy-chained over RS485 (A1/B1, up to 10 m between devices, not together with the WiNet module), the shared meter – through a COM100E/D, and each inverter gets its own AC circuit breaker.

Mounting and warranty

Wall bracket included; the manufacturer specifies that the fan-cooled enclosure must not be installed in bedrooms or other noise-sensitive rooms, and that clearance is left between several inverters. AC cable 6–10 mm² (outer diameter 14–25 mm), a 40 A circuit breaker is recommended. Manufacturer warranty under the Sungrow Deutschland GmbH distribution terms – 10 years for inverters up to 20 kW installed in EU countries, including Lithuania.

Technical specifications

Power

20 kW rated AC, 22 kVA; PV up to 30 kWp (150 %)

Phases

Three-phase, 3/N/PE, 230/400 V, 50 Hz

Voltage

PV up to 1 100 V; MPPT 160–1 000 V, full power 430–850 V; start-up 180 V

Current

AC up to 31.9 A per phase; PV 32 A / 32 A per MPPT, Isc 40 A / 40 A; 16 A per string

Features

2 MPPT, 4 strings (2+2), up to 15.5 kW per MPPT; 98.3 % max (Euro 97.9 %); export control

Communication

Wi-Fi / Ethernet via WiNet-S (COM1), RS485, DI/DO; iSolarCloud app

Protection

IP65, C5; DC switch, AFCI 2.0, PID, type II SPD DC/AC, residual current, anti-islanding

Operating temperature

−25 °C to +60 °C, 0–100 % RH (non-condensing), up to 4 000 m

Dimensions (W×D×H)

370 × 195 × 480 mm

Weight

22 kg

Mounting

Wall bracket (included); smart forced-air cooling

In the box

Inverter, bracket, 4 MC4 pairs, AC connector (≥15 kW), 5 cord-end terminals, COM, WiNet-S/S2

Compatibility

No battery port; DTSU666, DTSU666-20, DTSD1352-C meters; SP600S optimizers

Warranty

10 yr manufacturer (Sungrow Deutschland GmbH terms, ≤20 kW, installed in EU incl. Lithuania)