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VOLFAC Energy
KSTAR / BlueSpark seriesEnergy storage systemSingle-phase all-in-one hybrid system
All-in-one residential ESS.Hybrid inverter and stackable battery packs.
KSTAR

Energy storage / Residential

E5KS-D22

Single-phase all-in-one hybrid system · 3.68 to 6 kW

A residential energy storage system that stacks a single-phase hybrid inverter on low-voltage battery packs. Select the inverter power, review the specifications and bring your requirements to VOLFAC.

AC output
5 kW
Pack capacity
5.12 kWh
Battery packs
1–4
Inverter protection
IP66
Select power classBlueSpark familyBlueSpark, E(3.68–6)KS-D22 family
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Product overview

Inverter and battery in one stack.

The BlueSpark system pairs the E5KS-D22 hybrid inverter with BP48100PF1A-G2 battery packs of 5.12 kWh each; up to four packs stack without wiring between them. KSTAR lists self-consumption, peak shaving, time-of-use and battery-priority operating modes, on-grid and off-grid parallel configurations, and commissioning over Bluetooth with cloud monitoring.

Technical specifications

Know the details.

E5KS-D22
KSTARFamily BlueSparkModel E5KS-D22
Brand KSTARFamily BlueSpark, E(3.68–6)KS-D22Selected model E5KS-D22

Hybrid inverter — PV input

Recommended max. PV array input power (STC)
10 kW
Max. PV voltage
500 V
Nominal voltage
360 V
MPPT voltage range
120–480 V
MPPT voltage range at full load
250–425 V
Start voltage
120 V
MPPT trackers
2
Strings per MPPT tracker
1
Max. input current per MPPT
20 A
Max. short-circuit current per MPPT
25 A

Hybrid inverter — AC output and input (grid)

Max. AC continuous output power
5,000 W
Max. AC apparent output power
5,000 VA
Max. continuous input power
9,200 W
Nominal AC voltage
230 V AC
Nominal frequency
50 / 60 Hz (± 5 Hz)
Nominal output current
21.7 A
Max. output current
22.7 A
Max. input current
40 A
Power factor
−0.8 (lagging) to 0.8 (leading)
THDi
< 3 %
Country limits
Australia: 4,999 W / VA and 21.7 A; Germany and South Africa: 4,600 W / VA and 20 A; Ireland: 25 A output current

Hybrid inverter — backup output

Nominal AC output power
5,000 W
Max. AC output power
5,000 VA
Max. output current
21.7 A
Nominal output voltage
230 V AC
Nominal output frequency
50 / 60 Hz
Output THDv (linear load)
< 3 %

Hybrid inverter — battery input

Battery type
LFP (LiFePO4)
Nominal battery voltage
48 V
Charging voltage range
42–58 V
Max. charging / discharging current
120 A / 120 A
Rated charging / discharging power
5,000 W / 5,400 W
Battery capacity
100–400 Ah

Hybrid inverter — efficiency and protection

Max. PV efficiency
97.2 %
European efficiency
96.4 %
DC switch
Integrated
Anti-islanding protection
Integrated
Residual current monitoring
Integrated
AC short-circuit and overvoltage protection
Integrated
DC / AC surge protection
DC Type II; AC Type III
Remote shutdown
Integrated
AFCI
Optional

Hybrid inverter — general

Dimensions (W × H × D)
725 × 390 × 245 mm
Weight
25.5 kg
Operating temperature range
−25 °C to +60 °C, derating above 45 °C
Cooling
Natural convection
Max. operating altitude
≤ 4,000 m
Operating humidity
0–95 %, no condensation
IP class
IP66
Topology
High-frequency isolation
Communication
RS485, Wi-Fi; 4G or Ethernet optional
Display
LED and Bluetooth; app; web
Certification and standards
IEC/EN 62109-1 and -2; IEC/EN 61000-6-1, -6-2, -6-4; EN 61000-6-3; IEC/EN 61000-3-11; EN 61000-3-12; IEC 60529; IEC 61727; IEC 62116; IEC 60068; IEC 61683; EN 50549-1; EN 50549-10; VDE-AR-N 4105; G98/G99; NC RfG:2018; C10/C11; CEI 0-21

Battery pack BP48100PF1A-G2

Battery type
LFP (LiFePO4)
Cell brand
EVE
Energy capacity
5.12 kWh (at 25 °C, 0.5 C, beginning of life)
Usable capacity
4.6 kWh
Max. depth of discharge
95 %
Nominal voltage
51.2 V
Operating voltage range
44.8–57.6 V
Battery pack round-trip efficiency
> 94 %
Max. continuous charging / discharging current
80 A per pack
Max. continuous charging / discharging power
4,096 W
Operating temperature range
−10 to 50 °C with heating function; without heating, charging from 0 °C
Cooling
Natural cooling
Humidity
0–95 %, no condensation
Packs per system
Max. 4 (100 / 200 / 300 / 400 Ah)
Communication
CAN
Weight
56 kg
Dimensions (W × H × D)
725 × 370 × 190 mm
IP protection
IP65
Safety and transportation
Pack: IEC/EN 62619, UN 38.3 · Cell: IEC/EN 62619, UN 38.3, UL 1973

Manufacturer warranty statement

Battery pack
5-year product warranty, 10-year performance warranty

Source: KSTAR product pageKSTAR — BlueSpark series product page and the datasheet E(3.68-6)KS-D22 (EN, V1, January 2026). AC limits differ in some countries.

Downloads

Product documents.

  • Technical datasheetBlueSpark series · English · PDFE3.68KS-D22, E5KS-D22, E6KS-D22 with BP48100PF1A-G2 · English · PDF
  • Installation, operation and maintenance manualBlueSpark series · English · PDFE3.68KS-D22, E5KS-D22, E6KS-D22 · English · PDF
  • Quick installation manualBlueSpark series · English · PDFE3.68–6KS-D22 inverter · English · PDF
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BlueSpark familyBlueSpark, E(3.68–6)KS-D22 family

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