VOPV1000-3/3 Solar Combiner Box

VIOX Electric is a leading manufacturer of renewable energy electrical equipment, specializing in high-quality solar photovoltaic solutions for the global market. Our VOPV1000-3/3 Solar Combiner Box represents a premium multi-circuit solution designed specifically for advanced DC1000V solar systems requiring complete circuit independence, multi-inverter capability, and maximum operational flexibility.The VOPV1000-3/3 is a professional-grade DC combiner box engineered for high-voltage solar PV systems operating at DC1000V. This advanced 3-input, 3-output configuration features three completely independent circuits, each with dedicated protection and control devices. Unlike combined configurations, the 3/3 architecture maintains total isolation between strings, making it ideal for multi-inverter systems, multi-MPPT applications, three-phase installations, and projects requiring maximum safety through circuit independence.

Key Features & Benefits

• Three Independent Circuits: Complete electrical isolation between all three strings – each has its own protection and output
• Multi-Inverter Ready: Perfect for systems with multiple inverters or multi-MPPT input inverters
• Maximum Circuit Independence: Each string operates completely independently with dedicated switch, SPD, and fuses
• DC1000V High Voltage Rating: Optimized for next-generation solar systems with high-efficiency modules
• Triple Protection Systems: Three complete protection sets (3 switches, 3 SPDs, 6 fuses) for ultimate safety
• 45A Per Output: Each of the three outputs rated for 45A, supporting high-power strings
• Individual Control: Operate, maintain, or isolate any string without affecting the others
• Enhanced Safety: Complete circuit isolation eliminates cross-circuit faults and simplifies troubleshooting
• Large Capacity Enclosure: VOAT-39 (296 x 550 x 130mm) accommodates three full protection circuits
• Robust Construction: IP65-rated ABS enclosure withstands harsh environmental conditions
• Three-Phase Compatible: Ideal for three-phase inverter systems with separate DC inputs
• Phased Operation Ready: Activate or deactivate individual circuits for staged commissioning
• Certified Quality: Complies with EN50539 Type 2 standards for high-voltage photovoltaic applications

Technical Specifications

General Data

Parameter	Specification
Model	VOPV1000-3/3
Rated Voltage	DC1000V
Configuration	3 Independent Inputs / 3 Independent Outputs
Maximum Current Per Output	45A
Maximum String Current	15A per string
Degree of Protection	IP65
Operating Temperature	-25°C to +60°C
Maximum Altitude	2000m (standard), >2000m on request
Standard Compliance	EN50539 Type 2
Insulation Voltage	DC1500V
Circuit Independence	Complete electrical isolation between all three circuits
Recommended System Size	15-25kW (multi-inverter or multi-MPPT)

Enclosure Specifications

Parameter	Value
Model	VOAT-39
Material	ABS (Acrylonitrile Butadiene Styrene)
Protection Rating	IP65
Dimensions (H x W x D)	296mm x 550mm x 130mm
Mounting Type	Wall-mounted
Color	Light Gray (RAL 7035)
Fire Rating	Self-extinguishing, UL94 V0 flame-retardant material
UV Resistance	UV-stabilized for outdoor applications
Cable Entry Points	Multiple M16/M20/M25 knockouts (arranged for 3 circuits)
Weight	Approximately 6.5kg (with all components)
Internal Layout	Three independent circuit sections with clear separation and labeling

PV Switch Disconnector

Parameter	Specification
Model	VOD1-63/4B
Type	DC Load Break Switch
Quantity	3 units (one per circuit)
Rated Voltage	DC1000V
Rated Current	45A per switch
Number of Poles	2-pole (positive and negative) per switch
Breaking Capacity	According to EN50539
Operation	Manual rotary operation with clear ON/OFF indication
Mounting	DIN rail compatible (35mm)
Handle Type	Red/Green rotary handle with padlock facility
Contact Material	Silver alloy optimized for DC switching
Independence	Each switch controls only its corresponding circuit
Electrical Life	>10,000 operations at rated current
Mechanical Life	>100,000 operations

DC Surge Arrester (SPD)

Parameter	Specification
Model	VO-PV1000
Type	Type 2 DC Surge Protection Device
Quantity	3 units (one per circuit)
Maximum Continuous Operating Voltage (Uc)	DC1000V
Nominal Discharge Current (In)	20kA (8/20μs) per unit
Maximum Discharge Current (Imax)	40kA (8/20μs) per unit
Voltage Protection Level (Up)	≤3.5kV
Number of Poles	2-pole + PE per unit
Response Time	<25ns
Status Indication	Visual indicator window (green = OK, red = replace)
Standard	EN50539 Type 2, IEC 61643-31
Mounting	DIN rail compatible
Independence	Each SPD protects only its corresponding circuit
Follow Current Extinction	Self-extinguishing design
Thermal Disconnector	Integrated for end-of-life protection

DC Fuse Holder & Fuse

Parameter	Specification
Model	VOPV-32
Fuse Type	gPV (Photovoltaic fuse)
Rated Voltage	DC1000V
Rated Current	15A
Breaking Capacity	30kA @ DC1000V
Fuse Size	10 x 38mm
Configuration	6 fuse holders total (2 per string: positive and negative)
Fuse Links Included	6 pieces (15A DC gPV fuse)
Protection Scheme	Individual dual-pole protection for each of three strings
Mounting	DIN rail compatible
Standard	IEC 60269-6
Indicator	Visual fuse status indicator per holder
Contact Material	Copper, tin-plated
Operating Temperature	-40°C to +85°C

Electrical Configuration

The VOPV1000-3/3 features a unique three-independent-circuit architecture that fundamentally differs from combining configurations:

Three Independent Circuit Paths:

Circuit 1:

• String 1 Input (positive + and negative -)
• Dual-pole fuse protection (2 fuses)
• VO-PV1000 surge protection device
• VOD1-63/4B switch disconnector
• Output 1 (independent feed to inverter/MPPT input 1)

Circuit 2:

• String 2 Input (positive + and negative -)
• Dual-pole fuse protection (2 fuses)
• VO-PV1000 surge protection device
• VOD1-63/4B switch disconnector
• Output 2 (independent feed to inverter/MPPT input 2)

Circuit 3:

• String 3 Input (positive + and negative -)
• Dual-pole fuse protection (2 fuses)
• VO-PV1000 surge protection device
• VOD1-63/4B switch disconnector
• Output 3 (independent feed to inverter/MPPT input 3)

Key Architectural Features:

Complete Isolation:

• No electrical connection between the three circuits
• Each circuit operates independently
• Fault in one circuit does not affect others
• Individual voltage and current characteristics maintained

Independent Protection:

• Each string has dedicated overcurrent protection (fuses)
• Each circuit has dedicated surge protection (SPD)
• Each circuit has dedicated isolation switch
• Visual status monitoring for each protection device

Independent Control:

• Individual ON/OFF control per circuit
• Independent lockout/tagout capability
• Selective maintenance without system shutdown
• Phased commissioning and operation

Terminal Configuration:

• 6 input terminals (2 per string: +/-)
• 6 output terminals (2 per circuit: +/-)
• 1 common PE (Protective Earth) terminal
• All terminals rated for DC1000V
• Input terminals: 4-6mm² cable capacity
• Output terminals: 6-16mm² cable capacity

Bill of Materials

Item No.	Component	Model/Specification	Quantity
1	ABS Enclosure	VOAT-39, 296x550x130mm, IP65	1
2	DC Switch Disconnector	VOD1-63/4B, 2P, 45A, DC1000V	3
3	DC Surge Arrester	VO-PV1000, Type 2, 20kA, DC1000V	3
4	DC Fuse Holder	VOPV-32, 10x38mm, DC1000V	6
5	DC Fuse Link (gPV)	15A, DC1000V, 10x38mm, 30kA	6
6	Input Terminal Block	4-6mm², Red/Black, 1000V rated	6
7	Output Terminal Block	6-16mm², Red/Black, 1000V rated	6
8	PE Terminal Block	6-16mm², Yellow/Green	1
9	DIN Rail	35mm standard, zinc-plated	3
10	Cable Glands	M16/M20/M25, IP65 rated, 1000V	12
11	Mounting Brackets	Stainless steel 304	3
12	Circuit Separation Barriers	Non-conductive dividers	2
13	Circuit Labels	Circuit 1/2/3 identification labels	1 set
14	Warning Labels	DC1000V safety labels, multilingual	1 set
15	Installation Manual	English/Multi-language, 3/3 configuration guide	1

Applications

The VOPV1000-3/3 Solar Combiner Box is specifically designed for advanced solar installations requiring complete circuit independence:

Multi-Inverter Systems

• Systems with three separate string inverters
• Distributed inverter architectures
• Micro-inverter connection hubs
• Multiple small inverters for different roof sections
• Systems requiring inverter-level isolation for maintenance

Multi-MPPT Inverter Applications

• Three-MPPT input inverters (each circuit to separate MPPT)
• Optimized power harvest from different orientations
• Independent maximum power point tracking per string
• Hybrid inverters with multiple DC inputs
• High-performance inverters requiring isolated DC inputs

Three-Phase Solar Systems

• Three-phase inverter systems with separate DC inputs per phase
• Balanced three-phase power generation
• Industrial three-phase applications
• Grid-tied three-phase commercial installations
• Phase-specific power distribution requirements

Complex Multi-Orientation Arrays

• East-West-South three-orientation systems
• Different roof sections with distinct characteristics
• Mixed tilt angles requiring separate optimization
• Arrays with different shading patterns
• Optimal energy harvest from diverse conditions

Large Residential and Commercial Installations

• Premium residential systems (15-25kW) with advanced architecture
• Commercial rooftop arrays requiring maximum flexibility
• Building-integrated photovoltaic (BIPV) with multiple zones
• Industrial facilities with distributed solar generation
• Multi-tenant buildings with separate metering per circuit

Phased Installation and Expansion Projects

• Stage 1: Install Circuit 1, operate independently
• Stage 2: Add Circuit 2 without affecting Circuit 1
• Stage 3: Complete with Circuit 3 for full system capacity
• Flexibility: Each phase operates independently throughout process

High-Reliability and Safety-Critical Applications

• Systems requiring maximum fault isolation
• Critical infrastructure with redundancy requirements
• Applications demanding individual circuit control
• Projects requiring comprehensive safety documentation
• Installations with stringent compliance requirements

Monitoring and Data Acquisition Systems

• String-level performance monitoring
• Individual circuit data collection
• Advanced analytics requiring per-string data
• Fault detection and diagnostic systems
• Energy management systems with granular control

Benefits of 3/3 Independent Configuration

Complete Circuit Independence

• Total Electrical Isolation: Zero electrical connection between the three circuits
• Fault in one circuit cannot propagate to others
• Maximum system reliability through redundancy
• Simplified fault diagnosis and troubleshooting
• Enhanced safety through isolation

• Individual Circuit Control: Operate any circuit independently
• Maintenance on one circuit without system shutdown
• Selective activation for commissioning
• Independent testing and validation
• Flexible operational modes

Multi-Inverter System Advantages

• Perfect for Multiple Inverters: Direct connection to three separate inverters
• Distributed inverter architectures supported
• Optimal inverter sizing per circuit
• Inverter-level redundancy
• Individual inverter maintenance without system downtime

• Multi-MPPT Optimization: Each circuit to separate MPPT input for maximum efficiency
• Independent optimization per string orientation
• Better performance in complex shading scenarios
• Maximized energy harvest from diverse conditions
• Advanced power electronics integration

Enhanced Safety and Reliability

• Maximum Fault Isolation: Fault in one string does not affect others
• Continue operation at 67% capacity if one circuit fails
• Reduced risk of cascading failures
• Enhanced arc fault containment
• Simplified troubleshooting with isolated circuits

• Individual Protection Devices: Three complete protection sets eliminate single points of failure
• Independent surge protection per circuit
• Dedicated switching per circuit for maintenance safety
• Individual fusing prevents cross-circuit issues
• Redundant protection philosophy

Operational Flexibility

• Phased Commissioning: Activate circuits one at a time during commissioning
• Test each circuit independently
• Simplified startup procedures
• Reduced commissioning risk
• Systematic validation process

• Selective Maintenance: Service one circuit while others remain operational
• Minimize system downtime
• Scheduled maintenance without production loss
• Individual component replacement
• Simplified lockout/tagout procedures

• Mixed System Configurations: Different string configurations per circuit possible
• Varying module types or quantities per circuit
• Accommodate system changes over time
• Flexible for future modifications
• Support legacy and new components simultaneously

Performance Advantages

• Optimized Power Electronics: Each circuit optimized for its specific conditions
• Better MPPT performance with separate inputs
• Reduced losses from string mismatch
• Enhanced performance in partial shading
• Maximum energy yield from diverse orientations

• String-Level Monitoring: Precise performance data per circuit
• Identify underperforming strings immediately
• Detailed energy production analytics
• Predictive maintenance capabilities
• Enhanced system optimization

Cost-Benefit Analysis vs. 3/1 Configuration

• Higher Initial Investment but Greater Value: Three complete protection sets vs. shared components
• Larger enclosure to accommodate independent circuits
• More complex wiring but greater flexibility
• Higher component count ensures reliability

• Long-Term Operational Savings: Reduced maintenance downtime (maintain one circuit at a time)
• Better energy yield through optimization
• Lower risk of total system failure
• Simplified troubleshooting reduces service costs
• Extended system lifetime through redundancy

Ideal When:

• Using multi-MPPT inverters (maximize their capability)
• Multiple inverters in system (direct connection)
• Maximum reliability required (critical applications)
• Complex orientations (optimize each separately)
• Phased installation planned (add circuits over time)

Quality & Compliance

Certifications & Standards:

• EN50539 Type 2 – Photovoltaic (PV) systems – DC connectors for 1000V applications
• IEC 60269-6 – Low-voltage fuses for photovoltaic applications (1000V)
• IEC 61643-31 – Surge protective devices for photovoltaic installations (1000V)
• IEC 60947-3 – Low-voltage switchgear – Switches, disconnectors (1000V DC)
• IP65 – Ingress Protection (dust-tight and water jet protected)
• RoHS Compliant – Restriction of Hazardous Substances
• REACH Compliant – EU chemicals regulation
• CE Marking – European conformity

Quality Assurance Testing:

• 100% factory testing of all three independent circuits
• High-voltage withstand testing (DC1500V for 1 minute per circuit)
• Insulation resistance verification (>200MΩ @ DC1000V per circuit)
• Circuit isolation testing (>200MΩ between circuits)
• High-temperature aging tests (96 hours at 70°C)
• Thermal cycling tests (-40°C to +85°C, 100 cycles)
• Mechanical stress testing (vibration and impact per IEC standards)
• Contact resistance measurement on all terminals (<30μΩ)
• All three surge protection devices tested per IEC 61643-31
• UV aging test for enclosure materials (1000 hours)
• Independent operation verification for all three circuits

Manufacturing Excellence:

• ISO 9001:2015 certified manufacturing facility
• ISO 14001:2015 environmental management system
• Strict quality control procedures for multi-circuit assemblies
• Premium component selection from certified suppliers (UL, TÜV listed)
• Specialized assembly process for independent circuit architecture
• Manual inspection of all electrical connections and isolation barriers
• Comprehensive final inspection and functional testing per circuit
• Complete traceability system for all components and assemblies
• Continuous improvement programs based on field performance data

Installation & Maintenance

Installation Guidelines

Site Selection for Multi-Circuit Installation:

• Mount in a well-ventilated location with easy access for maintenance
• Ensure protection from direct sunlight, rain, and water accumulation
• Minimum clearance of 200mm on all sides for ventilation and access
• Consider cable entry paths from three different string locations
• Position for easy visual inspection of all three SPD indicators
• Ensure sufficient space for future service access to individual circuits

Mounting Procedure:

• Use appropriate mounting hardware rated for enclosure weight (6.5kg + cables)
• Ensure level installation using spirit level (critical for larger enclosure)
• Verify enclosure is securely fastened (minimum 6 fixing points due to size)
• Maintain IP65 protection rating after installation
• Consider load distribution on mounting surface due to weight

Circuit Connection Sequence:

• Label all three circuits clearly before connection (Circuit 1, 2, 3)
• Connect circuits in numerical order for systematic installation
• Critical: Maintain complete separation between circuits during wiring
• Verify correct polarity for each circuit before termination
• Use cables rated for DC1000V with appropriate temperature rating
• Input cables: 4-6mm² (15A max per string)
• Output cables: 6-16mm² (to accommodate 45A capacity)

Independent Circuit Wiring:

• Route Circuit 1, 2, and 3 cables separately to avoid confusion
• Use consistent color coding within each circuit (Red +, Black -)
• Maintain physical separation between circuit cables where possible
• Label all cables clearly with circuit number
• Apply proper torque to all terminals (1.2-1.5 Nm as specified)
• Ensure proper cable entry sealing with appropriate glands

Pre-Commissioning Checks (Per Circuit):

• Perform insulation resistance test on each circuit (minimum 200MΩ @ DC1000V)
• Verify insulation between circuits (minimum 200MΩ between any two circuits)
• Verify continuity of PE connection (common to all circuits)
• Check all mechanical connections for tightness in each circuit
• Confirm all three SPD indicators show green (operational status)
• Test each switch disconnector operation individually under no-load
• Verify all cable glands are properly sealed
• Measure open-circuit voltage of each string independently
• Critical: Verify no electrical connection exists between circuits

Phased Commissioning Procedure:

1. Commission Circuit 1 first, verify operation
2. Commission Circuit 2, ensure Circuit 1 unaffected
3. Commission Circuit 3, verify all three operate independently
4. Confirm isolation: disconnect each circuit individually while others operate

Safety Precautions

Multi-Circuit Safety Considerations:

• Critical: Even with one circuit disconnected, other circuits remain energized
• Never assume entire system is de-energized until ALL THREE circuits verified
• Use multi-point voltage testing on all three circuits independently
• Implement lockout/tagout procedures with THREE SEPARATE LOCKS if working on all circuits

DC1000V Multi-Circuit Safety:

• Qualified personnel only – specialized multi-circuit training required
• Always use appropriate PPE: insulated gloves (Class 2), safety glasses, arc-rated clothing
• Use CAT III 1000V rated test equipment only
• Be aware that capacitive charge may remain in cables after disconnection

Operational Safety:

• Always open the specific switch disconnector before accessing that circuit’s components
• Wait minimum 5 minutes after disconnection before opening enclosure
• Use voltage detector to verify absence of voltage on the specific circuit
• Test adjacent circuits to ensure they remain isolated
• Never exceed rated voltage (DC1000V) and current specifications
• Do not operate switch disconnectors under load
• Maintain clear identification of which circuit is being serviced

Maintenance Recommendations

Regular Inspection (Every 6 Months):

• Visual inspection of all three circuits for signs of damage or overheating
• Check all three SPD indicators (green = OK, red = replace immediately)
• Inspect enclosure for cracks, damage, or compromised seals
• Verify cable glands maintain proper seal integrity on all circuits
• Check for any signs of moisture ingress
• Inspect each circuit’s fuse status visually
• Verify circuit separation barriers remain intact

Annual Maintenance (Per Circuit):

• Verify all connections remain tight in each circuit (retorque: 1.2-1.5 Nm)
• Test each switch disconnector operation individually under no-load
• Perform insulation resistance test on each circuit (should be >200MΩ)
• Test insulation between circuits (should be >200MΩ between any pair)
• Clean enclosure exterior with damp cloth
• Inspect internal components in each circuit for signs of aging
• Verify string voltage on each circuit independently

Component Replacement (Per Circuit):

• Replace fuses only with identical specifications (15A gPV, DC1000V, 10x38mm, 30kA)
• Always replace fuses in pairs (positive and negative) for same circuit
• SPD replacement: only use VO-PV1000 or equivalent approved model
• When replacing SPD, only that circuit needs to be de-energized
• Maintain detailed maintenance log for each circuit separately
• Record component replacements per circuit for trend analysis

Independent Circuit Troubleshooting

Symptom	Possible Cause	Solution
Circuit 1 no output, Circuits 2&3 OK	Circuit 1 fuse blown	Check/replace Circuit 1 fuses only, others unaffected
	Circuit 1 switch OFF	Turn Circuit 1 switch to ON
All three circuits no output	Common issue upstream	Check array-level connections
	All three switches OFF	Verify all switches in ON position
One circuit overheating	Loose connection in that circuit	Retorque terminals in affected circuit only
	Undersized cable	Verify and upgrade cable for that circuit
One SPD indicator red	That circuit’s SPD end-of-life	Replace SPD in affected circuit, others continue operating
Unbalanced output between circuits	Different string configurations	Verify each string design independently
	Module degradation in one string	Investigate specific circuit’s performance
Frequent fuse failure (one circuit)	Short circuit in that specific string	Inspect string for that circuit only
	Overcurrent condition	Verify that circuit’s string design <15A
Two circuits normal, one intermittent	Faulty component in intermittent circuit	Isolate and diagnose that circuit independently

Technical Comparison: VOPV1000-3/3 vs VOPV1000-3/1

Feature	VOPV1000-3/3	VOPV1000-3/1
Architecture	3 Independent Circuits	3 Inputs Combined to 1 Output
String Inputs	3	3
Outputs	3 Independent	1 Combined
Circuit Isolation	Complete (no connection)	Combined (parallel connection)
Enclosure Size	296x550x130mm (VOAT-39)	296x230x120mm (VOAT-13)
Switch Disconnectors	3 units (one per circuit)	1 unit (after combining)
SPD Units	3 units (one per circuit)	1 unit (after combining)
Fuse Holders	6 (2 per string)	6 (2 per string)
Weight	~6.5kg	~3.5kg
Ideal Application	Multi-inverter, multi-MPPT	Single inverter, combined feed
Circuit Control	Individual per circuit	All circuits together
Fault Isolation	Complete (one circuit fails, others OK)	Partial (fault may affect combined output)
Maintenance Downtime	Minimal (service one, others run)	Full system (must disconnect all)
Multi-Inverter Support	Excellent (direct connection)	Not applicable
Multi-MPPT Support	Excellent (separate MPPT per circuit)	Limited (combined input)
System Size	15-25kW	10-15kW
Cost	Higher (triple protection)	Lower (shared protection)
Flexibility	Maximum	Moderate
Best For	Complex systems, maximum reliability	Simple systems, cost optimization

Why Choose VIOX VOPV1000-3/3?

• Unmatched Circuit Independence: Three completely isolated circuits eliminate cross-circuit interference, maximizing system reliability and allowing operation even if one circuit issues occur.
• Multi-Inverter System Excellence: Direct connection to three separate string inverters, ideal for distributed architectures and advanced multi-MPPT systems.
• Superior Safety Architecture: Triple protection systems eliminate single points of failure, with individual circuit control for safer maintenance and simplified lockout/tagout.
• Maximum Operational Flexibility: Supports phased commissioning, selective maintenance, and mixed configurations to adapt to changing system requirements.
• Professional Engineering: Large VOAT-39 enclosure with optimized internal layout, premium DC1000V components, and enhanced insulation coordination.
• Advanced System Capabilities: Supports string-level monitoring, smart solar installations, and sophisticated energy management systems.
• Long-Term Value: Higher reliability reduces total cost of ownership, minimizes maintenance downtime, and extends system lifetime through redundancy.

Get in Touch

Ready to implement the ultimate multi-circuit solution with the VOPV1000-3/3 Solar Combiner Box? Contact VIOX Electric today for:

• Detailed technical specifications and CAD drawings
• Multi-inverter and multi-MPPT system design consultation
• Independent circuit configuration optimization
• Competitive pricing and MOQ (Minimum Order Quantity) information
• Custom configuration options for specific project requirements
• Technical guidance on complex multi-circuit installations
• Sample orders for testing and evaluation
• Bulk order quotations with volume discounts
• Delivery timeline and international logistics support
• Specialized installation training for 3/3 independent configuration
• Product certifications and compliance documentation
• Integration support for multi-inverter systems
• String-level monitoring system recommendations