String inverterG3KS-D11
3 kW single-phase grid-tied inverter with one MPP tracker.
- AC output
- 3 kW
- MPP trackers
- 1
KSTAR / BlueGlow seriesString inverterSingle-phase grid-tied inverter
Single-phase, 3 to 6 kW.One MPP tracker (D11) or two (B21).
Inverters / Single-phase
G5KS-B21
Single-phase grid-tied inverter · 3 to 6 kW
A single-phase string inverter for residential rooftops. Select the model, review the specifications and bring your requirements to VOLFAC.
- AC output
- 5 kW
- MPP trackers
- 2
- Max. efficiency
- 98.1 %
- Ingress protection
- IP66
Select modelBlueGlow G3–6KS familyBlueGlow series, G(3–6)KS-D11 and G(5–6)KS-B21 family
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Product overview
One tracker or two, up to 550 V.
The G5KS-B21 is a transformerless single-phase inverter for 220/230 V grids. The D11 models have one MPP tracker at 20 A, the B21 models two trackers at 16 A each; all accept up to 550 V DC and KSTAR states a DC/AC ratio of up to 1.5. The inverter is cooled naturally, rated IP66 and weighs 7.6 to 9.5 kg. A Wi-Fi logger is standard; AFCI is optional.
- 1 or 2 MPP trackers20 A on one tracker (D11) or 16 A on each of two (B21); MPPT range 60–550 V.
- Up to 98.1 % efficiency97.5 % on the 3 kW model, 98.1 % on the 5 and 6 kW models.
- IP66, natural coolingOperating from −25 °C to +60 °C, up to 4,000 m.
- Wi-Fi logger standard2 × RS-485, Wi-Fi, GPRS and Bluetooth; LCD and app.
Technical specifications
Know the details.
G5KS-B21KSTARFamily BlueGlow G3–6KSModel G5KS-B21
Brand KSTARFamily BlueGlow series, G(3–6)KS-D11 and G(5–6)KS-B21Selected model G5KS-B21
Input (DC)
- Max. DC power
- 7.5 kWp
- Max. DC voltage
- 550 V
- Nominal voltage
- 360 V
- Start voltage
- 80 V
- MPPT voltage range
- 60–550 V
- MPPT voltage range at full load
- 180–500 V
- MPP trackers
- 2
- Strings per MPPT
- 1
- String inputs
- 2
- Max. input current per MPPT
- 16 A × 2
- Max. short-circuit current per MPPT
- 25 A × 2
Output (AC)
- Nominal AC output power
- 5,000 W
- Max. AC apparent power
- 5,500 VA
- Max. AC output power
- 5,500 W
- Nominal AC voltage
- 220 V / 230 V
- AC grid frequency
- 50 Hz / 60 Hz (± 5 Hz)
- Rated output current
- 22.7 A / 21.7 A
- Max. output current
- 25 A
- Power factor
- 0.8 lagging to 0.8 leading
- THDi
- < 3 % at nominal power
- Max. efficiency
- 98.1 %
- European efficiency
- 97.5 %
Protection
- Integrated protection
- DC switch, anti-islanding, output overcurrent, DC reverse polarity, string fault detection, insulation detection, AC short circuit
- Surge protection
- DC Type III, Type II optional; AC Type III
- AFCI protection
- Optional
General specifications
- Operating temperature
- −25 °C to +60 °C
- Cooling
- Natural
- Max. operating altitude
- ≤ 4,000 m
- Max. operating humidity
- 0–100 %
- Ingress protection
- IP66
- Topology
- Transformerless
- DC input terminal
- Vaconn
- AC output terminal
- Quick connector
- Communication
- 2 × RS-485, Wi-Fi, GPRS, Bluetooth
- Display
- LCD; Bluetooth and app
- Certificates
- IEC 62109-1/2; IEC 61000; IEC 60068; IEC 61727; IEC 62116; IEC 61683
Dimensions and weight
- Dimensions (W × H × D)
- 395 × 315 × 140 mm
- Weight
- 9.5 kg
Source: KSTAR product pageKSTAR — BlueGlow G3~6KS product page and the datasheet G(3-6)KS-D11, G(5-6)KS-B21 (EN, V2, April 2026).
Downloads
Product documents.
- Technical datasheetBlueGlow G3–6KS · English · PDFG(3-6)KS-D11, G(5-6)KS-B21 · English · PDF
- User manualBlueGlow G3–6KS · English · PDFG3KS to G6KS, 550 V version · English · PDF
- Manufacturer warranty terms, on-grid invertersKSTAR on-grid inverters · English · PDFKSTAR on-grid inverters · English · PDF
Request a quotation.Share your quantity and delivery destination. We reply with a quotation for G5KS-B21, not an order confirmation.
BlueGlow G3–6KS familyBlueGlow series, G(3–6)KS-D11 and G(5–6)KS-B21 family
More from this KSTAR series.
- String inverter
- String inverter
G5KS-D11
5 kW single-phase grid-tied inverter with one MPP tracker.
- AC output
- 5 kW
- MPP trackers
- 1
- String inverter
G6KS-D11
6 kW single-phase grid-tied inverter with one MPP tracker.
- AC output
- 6 kW
- MPP trackers
- 1
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