The Sungrow Battery Junction Box extends the configuration options for PowerKeeper energy storage, allowing multiple battery strings to be connected in parallel and providing a total capacity of up to 1,000 kWh per inverter. The solution is designed for commercial and industrial (C&I) applications, where energy requirements can evolve as business operations develop.

The increasing deployment of high-capacity energy storage systems calls for more flexible, scalable and reliable solutions. In this context, the Battery Junction Box allows a system to be sized for current requirements while making provision for subsequent expansion.

The modular PowerKeeper architecture therefore enables installers, system designers and EPC contractors to plan storage expansion around energy consumption, the introduction of new loads and the company’s energy management strategies.

Modular expansion: from 250 kWh to 1 MWh

The Battery Junction Box allows multiple PowerKeeper battery strings to be connected in parallel, increasing the installed storage capacity associated with a single inverter.

Configuration	Battery strings connected in parallel	Indicative maximum capacity
Without a Battery Junction Box	1	250 kWh
1 Battery Junction Box	2	500 kWh
2 Battery Junction Boxes	3	750 kWh
3 Battery Junction Boxes	4	1,000 kWh

The capacities shown are rounded figures: the PowerKeeper ST250CF configuration has a nominal capacity of 249.6 kWh. Sungrow documentation identifies the Junction Box as model SJC160-02.

This modular approach supports phased investment: a business can install the capacity it needs today and plan further expansion, increasing the capacity of an approximately 250 kWh configuration by up to four times, subject to the manufacturer’s compatibility requirements.

Benefits for installers, system designers and businesses

Phased system sizing and investment

The ability to expand storage capacity allows investment to be aligned with changing business requirements. For system designers, this means assessing the space, electrical connections and provisions required for future capacity increases from the outset.

Flexibility for new installations and retrofit projects

Sungrow describes PowerKeeper as suitable for both new projects and existing installations. For retrofit applications, integration must be assessed against the existing electrical architecture, inverter and control systems.

More energy available for business loads

Adding battery strings increases the amount of energy that can be stored and can extend the period for which loads are supplied. However, operational continuity and backup capability depend on the overall system configuration, the inverter’s functions and the requirements of critical loads.

Furthermore, increasing energy capacity in kWh does not automatically increase power output in kW: these two parameters must be sized separately.

Integration within the PowerKeeper ecosystem

The Junction Box is a dedicated component of the PowerKeeper architecture. The system features a pre-assembled design with simplified wiring, which Sungrow highlights as helping to reduce installation time. Any expansion must nevertheless follow the manufacturer’s wiring diagrams and procedures.

Battery Junction Box technical specifications

For model SJC160-02, the Sungrow datasheet specifies:

Maximum voltage: 1,000 V DC.
Rated current: 162.5 A per input and 200 A at the output.
Protection devices: fuses and a DC isolator.
Environmental protection: IP66 ingress protection rating and C5 corrosion resistance classification.
Installation: wall-mounted, with a maximum weight of 12 kg.

For installers and EPC contractors, scalability becomes a practical system design consideration: making provision for future expansion today allows increases in energy consumption to be addressed through planned upgrades.

Sungrow Battery Junction Box per SH50-80-125CX – SJC160-02 | A0ST7151

The Sungrow Battery Junction Box for SH50-80-125CX, product code A0ST7151, enables PowerKeeper storage capacity expansion in commercial and industrial applications. It allows multiple battery strings to be connected in parallel, providing an indicative total capacity of up to 1,000 kWh per inverter, in accordance with the configurations specified by the manufacturer.

Modular expansion: connection of two, three or four PowerKeeper battery strings using one, two or three Junction Boxes respectively.
Phased system sizing: storage capacity can be expanded to accommodate changes in the site’s energy requirements.
Integrated protection: fuses and a DC isolator.
Wall-mounted installation: compact design with a maximum weight of 12 kg.
Environmental protection: IP66 ingress protection rating and C5 corrosion resistance classification.

Datasheet English

Datasheet Sungrow Battery Junction Box SJC160-02 .pdf

Complete documentation

Sungrow website for complete documentation

Request a quote

Description

Storage configurations

Number of Junction Boxes	Battery strings connected in parallel	Indicative maximum capacity
1	2	500 kWh
2	3	750 kWh
3	4	1,000 kWh

Capacities are rounded figures based on battery strings of approximately 250 kWh. The PowerKeeper ST250CF configuration has a nominal capacity of 249.6 kWh.

Technical specifications

Parameter	Specification
Product designation	Battery Junction Box for SH50-80-125CX
Product code	A0ST7151
Model specified in Sungrow documentation	SJC160-02
Battery storage system	Sungrow PowerKeeper
Maximum DC voltage	1,000 V
Rated current per input	162.5 A
Rated output current	200 A
Protection devices	Fuses and DC isolator
Ingress protection rating	IP66
Corrosion resistance classification	C5
Dimensions, W × H × D	350 × 411 × 185 mm
Weight	≤ 12 kg
Mounting	Wall-mounted

The electrical and mechanical specifications refer to model SJC160-02, as listed in the Sungrow datasheet.

Applications and system sizing considerations

The Junction Box allows the storage system to be designed for future expansion, accommodating increased production loads or greater energy demand during periods without photovoltaic generation.

Increasing energy capacity in kWh does not automatically increase power output in kW. System sizing must take into account inverter limits, electrical connections and permitted configurations. Backup performance depends on the complete system configuration and the loads to be supplied.

Categories: Sungrow, Sungrow accessories Tags: A0ST7151, Battery Junction Box, C&I energy storage, industrial energy storage, modular battery storage, PowerKeeper, SH125CX, SH50CX, SH80CX, SJC160-02, Sungrow

Sungrow Battery Junction Box: PowerKeeper storage that scales with system requirements

Modular expansion: from 250 kWh to 1 MWh