SUN-18/20/21K-G04-LV
SUN-18-21K-G04-LV
The SUN-18/20/21K-G04-LV is a three-phase string inverter series that feeds solar power straight into the building and the grid, without a battery. It comes in 3 models, rated 18–21 kW.
We quote it on its own or as part of a matched system with Deye batteries and accessories. Availability, lead time and delivery to your site are confirmed in the written quotation.
No prices online: every order is quoted in writing.
- Manufacturer's category
- Three Phase String Inverter(LV)
- Rating
- 18–21 kW
- Phases
- 3-phase
- Models on this page
- 3
Models
| Model | Rating |
|---|---|
| SUN-18K-G04-LV | 18 kW |
| SUN-20K-G04-LV | 20 kW |
| SUN-21K-G04-LV | 21 kW |
Technical specifications
Values as published by the manufacturer, one column per model where the manufacturer's table has them.
A value across all model columns is the same for every model.
| Model | SUN-18K-G04-LV | SUN-20K-G04-LV | SUN-21K-G04-LV |
|---|---|---|---|
| Max. PV Input Power(kW) | 27 | 30 | 31.5 |
| Max. PV Input Voltage(V) | 800 | ||
| Start-up Voltage(V) | 250 | ||
| MPPT voltage range(V) | 200-700 | ||
| Rated PV Input voltage(V) | 350 | ||
| Max. Operating PV Input Current (A) | 40+40 | ||
| Max. Input Short Circuit Current (A) | 60+60 | ||
| No. of MPP Trackers/No. of Strings per MPP Tracker | 2/3+3 | ||
| Model | SUN-18K-G04-LV | SUN-20K-G04-LV | SUN-21K-G04-LV |
|---|---|---|---|
| Rated AC Output Active Power(kW) | 18 | 20 | 21 |
| Max. AC Output Apparent Power(kVA) | 18 | 20 | 21 |
| Rated AC output current (A) | 47.3/45.2 | 52.5/50.2 | 55.2/52.7 |
| Max. AC Output Current(A) | 47.3/45.2 | 52.5/50.2 | 55.2/52.7 |
| Rated output voltage/range (V) | 127V/220V, 133V/230V 0.85UN-1.1UN | ||
| Grid Connection Form | 3L/N/PE | ||
| Rated Output Grid Frequency/range(Hz) | 50/45-55, 60/55-65 | ||
| Power Factor Adjustment Range | 0.8 leading to 0.8lagging | ||
| Total Current Harmonic Distortion THDi | <3% | ||
| DC Injection Current | <0.5%ln | ||
| Model | SUN-18K-G04-LV | SUN-20K-G04-LV | SUN-21K-G04-LV |
|---|---|---|---|
| Max. Efficiency | 98.60% | ||
| MPPT Efficiency | >99% | ||
| Model | SUN-18K-G04-LV | SUN-20K-G04-LV | SUN-21K-G04-LV |
|---|---|---|---|
| DC Reverse Polarity Protection | Yes | ||
| AC Output Overcurrent Protection | Yes | ||
| AC Output Overvoltage Protection | Yes | ||
| AC Output Short Circuit Protection | Yes | ||
| Thermal Protection | Yes | ||
| Insulation Impedance Detection | Yes | ||
| DC Component Monitoring | Yes | ||
| Arc Fault Circuit Interrupter (AFCI) | Optional | ||
| Anti-islanding Protection | Yes | ||
| Residual Current Detection | Yes | ||
| Surge Protection Level | TYPE II(DC),TYPE II(AC) | ||
| DC Switch | Yes | ||
| Model | SUN-18K-G04-LV | SUN-20K-G04-LV | SUN-21K-G04-LV |
|---|---|---|---|
| Communication Interface | RS485/RS232 | ||
| Monitor Mode | GPRS/WIFI/Bluetooth/4G/LAN(optional) | ||
| Model | SUN-18K-G04-LV | SUN-20K-G04-LV | SUN-21K-G04-LV |
|---|---|---|---|
| Operating Temperature Range (°C) | -25 to +65℃, >45℃ Derating | ||
| Permissible Ambient Humidity | 0~100% | ||
| Permissible Altitude (m) | 2000m | ||
| Noise (dB) | ≤50 dB(A) | ||
| Ingress Protection(IP) Rating | IP 65 | ||
| Inverter Topology | Non-Isolated | ||
| Over Voltage Category | OVC II(DC),OVC III(AC) | ||
| Cabinet Size (WxHxD mm) | 330×572×206 (Excluding Connectors and Brackets) | ||
| Weight [kg] | 28.7 | ||
| Warranty [year] | 5 years | ||
| Type Of Cooling | Intelligent Air Cooling | ||
| Grid Regulation | NBR 16149, NBR 16150, EN 50549, RD 140 | ||
| Safety EMC/Standard | IEC/EN 61000-6-1/2/3/4, IEC/EN 62109-1, IEC/EN 62109-2 | ||
| Seguridad EMC/Estándar | IEC/EN 61000-6-1/2/3/4, IEC/EN 62109-1, IEC/EN 62109-2 | ||
Documents
- Datasheet (2026-04-23)Datasheet · EN · 500 KB · PDF ↗
- User manual (2026-07-01)Manual · EN · 7.2 MB · PDF ↗
All documents open from the manufacturer's own servers, so you always get the file Deye currently publishes. Most are in English.
Key features
As listed by the manufacturer.
- 127V/220V, 133V/230V and 50/60Hz, Three phase system
- 2 MPPT trackers, maximum and up to 98.6%
- Zero export application, VSG application
- String intelligent monitoring (optional)
- Wide output voltage range
- Anti-Pid Function (optional)
Independent dealerSECURISTIKA SRL is an independent dealer of Deye products. This website is not affiliated with, endorsed by or operated by the manufacturer.
Specifications, features and documents as published by the manufacturer. Check the current datasheet before you order. Source page (opens in a new tab)
Related series
String inverter
SUN-1/1.5/2/2.2/2.5/2.7/3/3.3/3.6/4K-G04P1-EU-AM1
Single-phase
String inverter
SUN-1/1.5/2/2.2/2.5/2.7/3/3.3/3.6/4K-G04P1-EU-CM1
Single-phase
String inverter
SUN-1/1.5/2/2.2/2.5/2.7/3/3.3/3.6/4K-G05P1-EU-CM1
Single-phase
String inverter
SUN-3/4/5/6/7/8/9/10/12/15K-G06P3-EU-BM2
Three-phase
Tell us what you are building
Send the models and quantities, or just the system size and the site country. We reply with a written quotation.