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Solar Combiner Box
Manufacturer

ShineTong designs and manufactures PV combiner boxes for residential, C&I and utility projects: DC string boxes (1000V / 1500V), AC distribution boxes, DC&AC combined boxes, and EPS battery boxes. OEM/ODM available for B2B partners.

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15+
Years Manufacturing
2-36
String Ways Covered
1500V
Max DC System Voltage
IP65
Weatherproof Standard
CE Certified
UL / TUV / SAA
1000V & 1500V DC
IP65 Protection
OEM/ODM Factory
Solar array installation for combiner box systems
1000V / 1500V DC System Voltage
Technology Overview

What Is a Solar Combiner Box?

A solar combiner box (PV string box / array junction box) sits between the PV array strings and the inverter DC input. It aggregates multiple parallel strings into one or more protected DC outputs, reducing cable runs and providing a single protection interface for the array.

A well-specified box typically includes string-level overcurrent protection (DC fuses or DC MCBs), a Type 2 DC SPD, a main DC disconnect or MCCB, copper busbars, and - on monitored models - string current measurement with RS485 Modbus output.

For distributors, EPCs and system integrators, the right voltage class, string count and monitoring option affects BOS cost, O&M efficiency and long-term yield assurance.

DC String Fuses (IEC 60269-6)
Type 2 DC SPD (IEC 61643-31)
DC MCB / Disconnect Switch
String Monitoring (RS485)
Copper Busbar Assembly
MC4 / Cable Gland Entry
System Architecture

How a PV Combiner Box Works

Signal and power flow through the combiner box - from string input to inverter output.

1

String DC Input

Each PV string connects to a dedicated input via MC4 connectors or cable glands. Voltage depends on string length; current depends on irradiance and panel Isc.

2

Fuse / MCB Protection

Each string passes through a DC-rated fuse or resettable MCB. A fault isolates only that string, protecting panels, cables and the inverter.

3

Busbar Aggregation & SPD

Strings combine on copper busbars. A Type 2 DC SPD clamps lightning-induced spikes and diverts surge energy to the PE ground rail.

4

Output & Monitoring

Combined DC power exits through the main disconnect to the inverter. Monitored models report per-string Idc via RS485 Modbus.

Product Catalog

ShineTong Combiner Box Series

From residential DC string boxes to commercial AC distribution and integrated DC&AC units. IP65 outdoor-rated enclosures.

ST-DCJB DC combiner box
DC Combiner
Residential & C&I - 1000V / 1500V DC
ST-DCJB Series

1-16 string inputs, 1-2 outputs. Fuse or MCB equipped. Optional string monitoring via RS485 Modbus.

System Voltage
1000V / 1500V DC
String Ways
1-16 In / 1-2 Out
Fuse Rating
10A / 15A DC
Protection
IP65
CEULTUV
Inquire ->
ST-DCJB-L multi-string combiner box
DC Multi-String
C&I & Utility - 1000V / 1500V DC
ST-DCJB-L Series

Up to 36 string inputs. Integrated SPD 40kA Type 2. Main MCB 63A/125A. Wall or pole mount.

String Ways
Up to 36 Strings
SPD
40kA Type 2
Main MCB
63A / 125A
Monitoring
RS485 optional
CEULTUV
Inquire ->
ST-ACDB AC combiner box
AC Combiner
Residential & Light Commercial - AC
ST-ACDB Series

Single-phase (S3, S6) and three-phase (T10, T20) AC distribution. Ideal downstream of microinverters or string inverters.

Models
S3 / S6 / T10 / T20
Phase
1-Phase / 3-Phase
AC Circuits
3 to 20 Ways
Protection
IP65 / Anti-UV
CECBSAA
Inquire ->
ST-DCACJB DC and AC combined box
DC & AC Combined
Residential & C&I - All-in-One
ST-DCACJB Series

Integrates DC string combiner and AC distribution in one enclosure. Models: 1-1/S3, 2-2/S6, 2-2/T10, 2-2/T20.

Topology
DC + AC Combined
DC Inputs
1-2 Strings
AC Ways
S3 / S6 / T10 / T20
Protection
IP65
CEULSAA
Inquire ->
ST-EPS battery box
EPS / Battery Box
Energy Storage Integration
ST-EPS Box Series

Emergency Power Supply box for solar-plus-storage systems. Integrates battery disconnect, SPD and load switching.

Application
Backup / ESS
Functions
Disconnect + SPD
Mounting
Wall Mount
Protection
IP65
CECBSAA
Inquire ->
ST-DCJB-M smart monitored combiner box
Smart Monitored
C&I & Utility - Intelligent
ST-DCJB-M Smart Series

All features of ST-DCJB-L plus per-string current monitoring, LCD display and RS485 Modbus RTU for yield analysis.

Monitoring
Per-string Idc
Protocol
RS485 Modbus
Display
Digital LCD
Voltage
1000V / 1500V
CEULTUV
Inquire ->
Why ShineTong

Built for Real Project Conditions

Engineering choices that affect array uptime, fault isolation and O&M cost.

01

DC-Rated Fuses (IEC 60269-6)

PV-specific DC fuses interrupt DC fault currents reliably. AC fuses are not a substitute in string combiner applications.

02

Type 2 SPD (IEC 61643-31)

DC surge protection sized for photovoltaic systems, helping clamp lightning-induced transients before they reach the inverter.

03

Optional String Monitoring

Hall-effect sensors and RS485 output support faster fault finding and underperformance analysis on larger plants.

04

IP65 Outdoor Enclosures

UV-stabilized, flame-retardant enclosures designed for rooftop and ground-mount environments.

05

MC4 / Gland Entry Options

String inputs configured for MC4-compatible connectors or cable glands to match your site standard.

06

2 to 36 String Ways

Configure string count, fuse vs MCB, monitored vs unmonitored, and mounting style for the project BOM.

Technical Parameters

Key Specs at a Glance

IP65
Outdoor Protection Rating
-25~60�C
Ambient Operating Range
3yr
Standard Product Warranty
ParameterST-DCJBST-DCJB-LST-ACDB
Primary UseResidential / C&I DCC&I / Utility DCAC Distribution
System Voltage1000V / 1500V DC1000V / 1500V DCAC 230/400V
String / Circuit Ways1-16Up to 363-20
SPDType 2 DCType 2 40kAAC SPD options
MonitoringOptional RS485Optional / Smart-
EnclosureIP65IP65IP65
FAQ

Frequently Asked Questions

Is ShineTong a manufacturer or a trading company? ?
ShineTong manufactures combiner boxes and related PV BOS products for B2B export. We support OEM/ODM, project-specific configurations and factory quotations for distributors and EPCs.
Can ShineTong combiner boxes be used with any inverter brand? ?
Yes, when voltage, current and protection ratings match the inverter DC/AC input design. Share your inverter model and string plan and we will recommend a suitable configuration.
What is the minimum order quantity and typical lead time? ?
Sample and trial orders are available for new partners. Stocking and project lead times depend on configuration and quantity - confirm on quotation.
Does RS485 Modbus integrate with inverter monitoring platforms? ?
Monitored models output Modbus RTU over RS485. Integration depends on the inverter or SCADA platform. Provide your target protocol map when you inquire.
What warranty do ShineTong combiner boxes carry? ?
Standard warranty is typically 3 years against manufacturing defects under normal use. Extended terms can be discussed for volume partners.

Ready to Source Solar Combiner Boxes?

Get factory pricing, OEM options and configuration support for your market. Tell us voltage class, string count and quantity.

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