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4 Strings in 1 Out PV Array Combiner Box For Off/On Grid Solar Power System
Product Introduction
PV combiner box in the on grid solar system
PV combiner box in the off grid solar system
1
In the solar power system, in order to decrease the connecting line, simplify maintenance, reduce losses, optimize system structure, and improve the safety and reliability of items, the PV combiner box is typically required between the solar panels and the inverter.
2
In addition to the PV junction function, the combiner box also features reverse current prevention, over-current protection, over-voltage protection, lightning protection, and other essential safety measures. It monitors the running state, current, voltage, power after junction, arrester state, DC circuit breaker status, Arc detection, and leakage detection (optional).
3
The PV combiner boxes we manufacture are equipped with all the functions mentioned above, configuring seamlessly with on-grid/off-grid solar inverters to establish a complete solar power system.
4
When selecting a PV combiner box, based on the input DC voltage range and output power of the inverter, a specified quantity of panels connects in series as a string. Multiple strings then connect in parallel to the PV combiner box for junction, routed through the circuit breaker and surge protection devices to feed the inverter safely.
Main Features
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Conform to CGC/GF002:2010, PV Array Junction Box Technical Specifications.
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Allows up to 24 strings of panels to connect. Nominal voltage of each string is 10A, maximum 15A.
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Total output current of 250A with a maximum voltage of 1000Vdc.
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High voltage fuse protection and anti-reverse connection protection for each string.
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Equipped with professional PV high voltage surge protection (SPD).
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PV high voltage circuit breaker controls the output, pressure-resistant DC1200V, with optional fusing current.
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IP65 protection rating, certified for durable outdoor installations.
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Isolated RS485 port for remote data communication, supporting MODBUS-RTU protocol.
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Built-in protection alarm system with programmable parameters and switchable status controls.
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Real-time harmful arc monitoring in the DC circuit. Automatic fault circuit shut-off effectively prevents electrical fires.
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Technical Data Sheet
| Model |
DM-CB4 |
| Basic Specifications |
| Max. PV Array Voltage |
1000V |
| Max. PV Array Parallel Inputs |
4 |
| Rated Fuse Current (Replaceable) |
15A |
| Allowable Input Current |
10A |
| Output Circuit Breaker |
60A |
| Max. Output Current |
40A |
| Diameter of Wire of Input PV Array |
2.5 mm² |
| Diameter of Wire of Output PV Array |
8 mm² |
| Diameter of Wire for Ground |
10 mm² |
| PV Dedicated SPD |
Yes |
| Signal Arrester |
Yes |
| IP Rating |
IP65 |
| Size (MM) |
530 * 580 * 200 mm |
| Weight |
15 kg |
| Environment Range |
| Normal Working Temp / Humidity |
-25°C to 60°C, Humidity 95% (No condensation, no corrosive gas) |
| Storage Temperature Range |
-50°C to 125°C |
| Altitude (m) |
< 2000m |
| Alarm Functions |
DC Arc fault state, voltage alarm, current alarm, temperature alarm, etc. |
| Optional Features |
| Communication Interface |
RS485 / Modbus-RTU Protocol |
| Current Monitor for Each String |
Yes |
Payment & Delivery
Frequently Asked Questions
What does a 4 strings in 1 out PV combiner box do?
It aggregates the DC current generated by 4 independent solar panel strings into a single unified output. This simplifies the wiring between the panels and the inverter, optimizes safety protection, and makes system maintenance much easier.
Can this combiner box be installed outdoors?
Yes. The combiner box is designed with an IP65 protection rating, making it completely dust-proof and protected against water jets. This ensures stable and reliable performance in harsh outdoor weather conditions.
Does this device support both on-grid and off-grid solar systems?
Yes, it is fully compatible with both on-grid and off-grid solar power systems, coordinating perfectly with solar inverters to ensure system safety and efficiency.
What built-in protection features does the box offer?
It features reverse current protection, over-current/fuse protection, high voltage surge protection (SPD), lightning protection, and intelligent DC arc fault detection with automatic fault-circuit trip to prevent fire hazards.
Does the box support remote performance monitoring?
Yes, an optional isolated RS485 communication interface is available, which supports the standard MODBUS-RTU protocol for remote system data logging, monitoring, and parameter settings.
Demin Power
