Deye SUN-20K-G05 On-Grid Inverter

The Deye SUN-20K-G05 is a three-phase On-Grid inverter for commercial roofs where 20 kW AC is the authorized export tier and storage is deferred.

Tech Specs

Deye SUN-20K-G05 On-Grid Inverter — Tech Specs
Parameter	SUN-18K-G05	SUN-20K-G05	SUN-22K-G05	SUN-23K-G05	SUN-25K-G05
PV String Input Data
Max. PV Input Power(kW)	23.4	26	28.6	29.9	32.5
Max. PV Input Voltage(V)	1100
Start-up Voltage(V)	250
MPPT voltage range(V)	200-1000
Rated PV Input voltage(V)	600
Max. Input Short Circuit Current (A)	39+39
Max. Operating PV Input Current(A)	26+26
No. of MPP Trackers/No. of Strings per MPP Tracker	2/2+2
AC Output Side
Rated AC Output Active Power(kW)	18	20	22	23	25
Max. AC Output Apparent Power(kVA)	19.8	22	24.2	25.3	27.5
Rated AC output current (A)	27.3/26.1	30.3/29	33.4/31.9	34.9/33.4	37.9/36.2
Max. AC Output Current(A)	30/28.7	33.3/31.9	36.7/35.1	38.4/36.7	41.7/39.8
Rated output voltage/range (V)	220/380V, 230/400V 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 0.8 lagging
Total Current Harmonic Distortion THDi	<3%
DC Injection Current	<0.5%ln
Efficiency
Max. Efficiency	98.50%
Euro Efficiency	98%
MPPT Efficiency	>99%
Equipment Protection
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
Interface
Communication Interface	RS485/RS232
Monitor Mode	GPRS/WIFI/Bluetooth/4G/LAN(optional)
General Data
Operating Temperature Range (°C)	-25 to +60℃, >45℃ Derating
Permissible Ambient Humidity	0~100%
Permissible Altitude (m)	4000m
Noise (dB)	≤ 50dB(A)
Ingress Protection(IP) Rating	IP 65
Inverter Topology	Non-Isolated
Over Voltage Category	OVC II(DC),OVC III(AC)
Cabinet Size (WxHxD mm)	362mm527mm220mm（Excluding connectors and brackets）
Weight [kg]	20
Warranty [year]	5 years
Type Of Cooling	Intelligent air cooling
Grid Regulation	IEC 61727,IEC 62116,CEI 0-21,EN 50549,NRS 097,RD 140,UNE 217002,OVE-Richtlinie R25,G99,VDE-AR-N 4105
Safety EMC/Standard	IEC/EN 61000-6-1/2/3/4, IEC/EN 62109-1, IEC/EN 62109-2

At 20 kW AC, cumulative DC currents and conductor sizing already demand professional switchgear—but still far simpler than a 51.2 V energy storage combiner farm. The G05 series feeds directly into low-voltage commercial switchboards, offsetting compressors, HVAC, and production lines during solar hours.

Without energy storage units, O&M focuses on MPPT performance, inverter fan hygiene, and periodic export limit verification against utility meters. Revenue models lean on self-consumption at 0.35 ₾/kWh rather than export credits alone—size arrays to load curves, not just roof area.

When policy or reliability later mandates storage, pair this plant with a parallel hybrid feeder or AC-couple a storage inverter on critical loads. Document roof penetration and conduit routes during initial build to simplify retrofit.