KSTAR BlueSpark E3.68–6KS-D22 — single-phase energy storage system, 3.68–6 kW

Supplied as an official KSTAR partner

Manufacturer: KSTAR · China · Model: BlueSpark E3.68–6KS-D22

A single-phase hybrid energy storage system rated 3.68–6 kW with modular low-voltage LFP batteries of 5.12 kWh each. Up to 4 batteries connect to one inverter. It is designed for a private house with a single-phase supply, where a PV plant is combined with backup power.

Hybrid inverter: E3.68KS-D22, E5KS-D22, E6KS-D22
Battery: BP48100PF1A-G2, LFP, 5.12 kWh (usable 4.6 kWh), IP65
Batteries per system: up to 4
Battery efficiency (cycle): > 94 %

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Technical specifications

Hybrid inverter	E3.68KS-D22, E5KS-D22, E6KS-D22
Battery	BP48100PF1A-G2, LFP, 5.12 kWh (usable 4.6 kWh), IP65
Batteries per system	up to 4
Battery efficiency (cycle)	> 94 %
Max. PV efficiency	97.2 %
Inverter ingress protection	IP66

Specifications are taken from the manufacturer’s technical documentation. Updated 11/06/2026.

Description

The inverter comes in the E3.68KS-D22, E5KS-D22 and E6KS-D22 versions, so the power is matched to the peak load of the house. The maximum efficiency of the PV path is 97.2 %, and the charge–discharge cycle efficiency of the battery exceeds 94 %. The BP48100PF1A-G2 battery uses LiFePO4 (LFP) chemistry at 5.12 kWh, of which 4.6 kWh is usable. Modules are added one at a time, so capacity can be extended after the system is running, without replacing the inverter. The inverter is rated IP66 and the battery IP65, so both can be installed outside a heated room, for example on a garage wall or under a canopy.

How to choose

Power comes first. For a single-phase supply pick the E3.68KS-D22, E5KS-D22 or E6KS-D22, and set the energy reserve by the number of batteries, from one to 4. If the supply is three-phase or more power is needed, look at the BlueSpark E4–12KT-D22 at 4–12 kW, which takes up to 8 batteries. The Home Series HH at 3.6–10 kW uses H-PACK-5.1 batteries of the same 5.12 kWh capacity, but its inverter is rated IP20 and its battery IP21, so it is meant for indoor use.

Request a price and lead time

BlueSpark E3.68–6KS-D22 — single-phase energy storage system, 3.68–6 kW, KSTAR. We reply within one business day.

Or email office@usk.ua or call +38 (044) 339-50-20.

FAQ

How many batteries can be connected to the E6KS-D22 hybrid inverter?

The system takes up to 4 BP48100PF1A-G2 batteries of 5.12 kWh each. Capacity grows step by step as modules are added.

What is the usable capacity of the BP48100PF1A-G2 battery?

Nominal capacity is 5.12 kWh and usable capacity is 4.6 kWh. The usable figure is the one used when calculating backup time.

Can the BlueSpark system be installed outdoors?

The inverter is rated IP66 and the battery IP65, so dust and water jets do not interfere with operation. The mounting place is still chosen with a temperature margin.

What is the efficiency of this storage system?

The maximum PV efficiency is 97.2 %, and the battery cycle efficiency exceeds 94 %.

Is the system suitable for a three-phase grid?

No, this version is single-phase. For a three-phase supply there is the BlueSpark E4–12KT-D22 at 4–12 kW.