Reliable DC string aggregation and protection for solar installations
A solar string combiner box brings together multiple photovoltaic (PV) string outputs into a common DC output, helping simplify system wiring and organise connections between the solar array and inverter.
Synchro Electricals offers string combiner box solutions for commercial and industrial solar projects, with configurations based on project-specific electrical and protection requirements. Depending on the design, these may include string fuses, DC isolation, surge protection and string monitoring.
Built to Perform
Multiple string inputs
Combines multiple solar PV string inputs into a common DC output, helping simplify wiring & system connections.
Overcurrent protection
String fuses or other specified protection devices help protect DC circuits against overcurrent conditions.
Surge Protection
Surge protection devices help protect connected equipment from transient voltage surges, including those caused by lightning.
String monitoring
Where supported, string-level monitoring helps identify abnormal operating conditions and simplifies system troubleshooting.
Weather-Resistant Enclosure
Enclosure protection is selected according to the installation environment, helping protect internal components from dust and moisture.
Flexible Configuration
Available configurations can be tailored to project requirements, including string count, DC voltage ratings and specified protection components.
Built to Specification
A well-designed string combiner box helps organise solar DC connections and supports the protection of critical system components. Synchro Electricals offers project-specific configurations based on electrical ratings, protection requirements and installation conditions, helping solar EPCs and industrial customers meet their system requirements with greater confidence.
Enhanced PV system safety
Helps protect solar DC circuits against overcurrent conditions and transient voltage surges when the specified protection devices are included.
Improved operational efficiency
Centralised string connections help organise DC wiring and make system inspection and maintenance more manageable.
String-Level Monitoring
Where monitoring is available, helps identify abnormal string performance and supports timely troubleshooting.
Weather-Resistant Construction
Designed with enclosure options suited to the installation environment, helping protect internal components from dust and moisture.
The Synchro Edge
- Project-Specific Engineering: String combiner box configurations tailored to solar project requirements, including string inputs, electrical ratings and protection needs.
- Support from Selection to Delivery: Assistance in understanding product specifications, reviewing project requirements and coordinating supply based on the agreed scope.
Where It Works
Factory and warehouse rooftops
- Efficiently combines multiple strings while protecting inverters from overcurrent
- Centralised monitoring keeps PV system performance stable and visible
- Scales easily for larger industrial rooftop installations
Commercial buildings and offices
- Streamlined wiring reduces installation cost and complexity
- Surge protection safeguards sensitive office equipment and inverters
- Real-time monitoring optimises rooftop solar efficiency
Mixed-use industrial complexes
- Supports multiple rooftop PV systems connected to a single inverter
- Ensures safety compliance and protects rooftop electrical infrastructure
- Reduces downtime and simplifies troubleshooting for continuous power flow
What is a string combiner box and why does it matter?
It combines multiple solar strings into a single DC output while providing monitoring, surge protection, and overcurrent protection – critical for safety and yield on commercial and industrial rooftops.
Can it be customised for our project?
Yes — configured by number of strings, voltage, and monitoring requirements.
Where are these typically used?
Factory rooftops, warehouses, office buildings, and mixed-use industrial sites.
Are they weatherproof for outdoor rooftops?
Yes — IP65/IP66-rated enclosures built for harsh rooftop conditions.
Do they offer monitoring?
Yes — optional current sensors and monitoring interfaces for real-time string performance tracking.
What protection devices can be included in a string combiner box?
Depending on the system design, a string combiner box may include DC string fuses, surge protection devices and DC isolators. The selection depends on the electrical ratings, system architecture and applicable project requirements.
What affects the price of a solar string combiner box?
The price depends on factors such as the number of string inputs, DC voltage rating, protection components, enclosure requirements, monitoring features and order quantity. Providing project specifications helps the manufacturer prepare a more relevant quotation.
Looking for a string combiner box built to endure real rooftop conditions? We manufacture high-endurance, ready-to-install combiner boxes with surge protection and monitoring, configured to your project.