VOPV1000-2/2 Solar Combiner Box

Product Overview

VIOX Electric is a leading manufacturer of renewable energy electrical equipment, specializing in high-quality solar photovoltaic solutions for the global market. Our VOPV1000-2/2 Solar Combiner Box represents a professional dual-circuit solution designed specifically for advanced DC1000V solar systems requiring complete circuit independence, dual-inverter capability, and optimal operational flexibility.

The VOPV1000-2/2 is a professional-grade DC combiner box engineered for high-voltage solar PV systems operating at DC1000V. This advanced 2-input, 2-output configuration features two completely independent circuits, each with dedicated protection and control devices. Unlike combined configurations, the 2/2 architecture maintains total isolation between strings, making it ideal for dual-inverter systems, dual-MPPT applications, east-west orientation arrays, and projects requiring maximum safety through circuit independence.

Key Features & Benefits

• Dual Independent Circuits: Complete electrical isolation between two strings – each has its own protection and output
• Dual-Inverter Ready: Perfect for systems with two separate inverters or dual-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
• Dual Protection Systems: Two complete protection sets (2 switches, 2 SPDs, 4 fuses) for ultimate safety
• 45A Per Output: Each of the two outputs rated for 45A, supporting high-power strings
• Individual Control: Operate, maintain, or isolate either string without affecting the other
• Enhanced Safety: Complete circuit isolation eliminates cross-circuit faults and simplifies troubleshooting
• East-West Optimization: Ideal for east-west facing arrays with separate MPPT tracking
• Medium Capacity Enclosure: VOAT-18 (380 x 230 x 120mm) efficiently accommodates two full protection circuits
• Robust Construction: IP65-rated ABS enclosure withstands harsh environmental conditions
• Cost-Effective Independence: Dual circuit architecture at lower cost than 3/3 configuration
• Certified Quality: Complies with EN50539 Type 2 standards for high-voltage photovoltaic applications

Technical Specifications

General Data

Parameter	Specification
Model	VOPV1000-2/2
Rated Voltage	DC1000V
Configuration	2 Independent Inputs / 2 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 both circuits
Recommended System Size	10-15kW (dual-inverter or dual-MPPT)

Enclosure Specifications

Parameter	Value
Model	VOAT-18
Material	ABS (Acrylonitrile Butadiene Styrene)
Protection Rating	IP65
Dimensions (H x W x D)	380mm x 230mm x 120mm
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 2 circuits)
Weight	Approximately 4.5kg (with all components)
Internal Layout	Two independent circuit sections with clear separation and labeling

PV Switch Disconnector

Parameter	Specification
Model	VOD1-63/4B
Type	DC Load Break Switch
Quantity	2 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	2 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	4 fuse holders total (2 per string: positive and negative)
Fuse Links Included	4 pieces (15A DC gPV fuse)
Protection Scheme	Individual dual-pole protection for each of two 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 VOPV1000-2/2 features a dual-independent-circuit architecture that maintains complete separation between strings:

Two 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)

Key Architectural Features:

Complete Isolation:

• No electrical connection between the two circuits
• Each circuit operates independently
• Fault in one circuit does not affect the other
• 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
• Simplified commissioning and operation

Terminal Configuration:

• 4 input terminals (2 per string: +/-)
• 4 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-18, 380x230x120mm, IP65	1
2	DC Switch Disconnector	VOD1-63/4B, 2P, 45A, DC1000V	2
3	DC Surge Arrester	VO-PV1000, Type 2, 20kA, DC1000V	2
4	DC Fuse Holder	VOPV-32, 10x38mm, DC1000V	4
5	DC Fuse Link (gPV)	15A, DC1000V, 10x38mm, 30kA	4
6	Input Terminal Block	4-6mm², Red/Black, 1000V rated	4
7	Output Terminal Block	6-16mm², Red/Black, 1000V rated	4
8	PE Terminal Block	6-16mm², Yellow/Green	1
9	DIN Rail	35mm standard, zinc-plated	2
10	Cable Glands	M16/M20/M25, IP65 rated, 1000V	8
11	Mounting Brackets	Stainless steel 304	2
12	Circuit Separation Barrier	Non-conductive divider	1
13	Circuit Labels	Circuit 1/2 identification labels	1 set
14	Warning Labels	DC1000V safety labels, multilingual	1 set
15	Installation Manual	English/Multi-language, 2/2 configuration guide	1

Applications

The VOPV1000-2/2 Solar Combiner Box is specifically designed for dual-circuit solar installations requiring complete circuit independence:

Dual-Inverter Systems

• Systems with two separate string inverters
• Distributed inverter architectures
• Two independent power feeds for redundancy
• Different inverter types or brands per circuit
• Systems requiring inverter-level isolation for maintenance

Dual-MPPT Inverter Applications

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

East-West Orientation Systems

• East-facing array on Circuit 1, West-facing on Circuit 2
• Extended daily generation profile optimization
• Morning and evening power production balance
• Reduced midday power peaks
• Optimal for grid-friendly solar systems

Multi-Orientation Arrays

• Two different roof sections with distinct characteristics
• Different tilt angles requiring separate optimization
• Arrays with varying shading patterns
• North-south split for Southern Hemisphere applications
• Optimal energy harvest from diverse conditions

Residential and Commercial Installations

• Medium residential systems (10-15kW) with dual-orientation capability
• Commercial rooftop arrays requiring maximum flexibility
• Building-integrated photovoltaic (BIPV) with two zones
• Industrial facilities with split solar generation
• Multi-tenant buildings with separate metering per circuit

Phased Installation Projects

• Stage 1: Install Circuit 1, operate independently
• Stage 2: Add Circuit 2 without affecting Circuit 1
• Flexibility: Each phase operates independently throughout process
• Investment Protection: Start small, expand when budget allows

High-Reliability Applications

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

Split-Array Configurations

• Different module types per circuit (testing or migration)
• Mixed string lengths or module counts
• Separate monitoring per orientation
• Independent performance analysis
• Flexible for future modifications

Benefits of 2/2 Independent Configuration

Complete Circuit Independence

Total Electrical Isolation

• Zero electrical connection between the two circuits
• Fault in one circuit cannot propagate to the other
• Maximum system reliability through redundancy
• Simplified fault diagnosis and troubleshooting
• Enhanced safety through isolation

Individual Circuit Control

• Operate either circuit independently
• Maintenance on one circuit without system shutdown
• Selective activation for commissioning
• Independent testing and validation
• Flexible operational modes

Dual-Inverter System Advantages

Perfect for Two Inverters

• Direct connection to two separate inverters
• Distributed inverter architectures supported
• Optimal inverter sizing per circuit
• Inverter-level redundancy
• Individual inverter maintenance without system downtime

Dual-MPPT Optimization

• Each circuit to separate MPPT input for maximum efficiency
• Independent optimization per string orientation
• Better performance in different sun exposure patterns
• Maximized energy harvest from dual orientations
• Advanced power electronics integration

East-West System Excellence

Optimal for East-West Arrays

• Morning power from east array (Circuit 1)
• Evening power from west array (Circuit 2)
• Extended daily generation profile
• Reduced midday grid stress
• Grid-friendly power distribution

Performance Benefits

• Better annual energy yield than south-only systems in many locations
• Reduced curtailment in high-solar regions
• More valuable power generation during peak hours
• Lower temperature operation (panels never face direct noon sun)
• Reduced inverter oversizing requirements

Enhanced Safety and Reliability

Maximum Fault Isolation

• Fault in one string does not affect the other
• Continue operation at 50% capacity if one circuit fails
• Reduced risk of cascading failures
• Enhanced arc fault containment
• Simplified troubleshooting with isolated circuits

Dual Protection Systems

• Two 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

Simplified Maintenance

• Service one circuit while the other remains operational
• Minimize system downtime
• Scheduled maintenance without production loss
• Individual component replacement
• Simplified lockout/tagout procedures

Phased Commissioning

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

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

Cost-Benefit Analysis

Optimal Cost-Performance Balance

• More economical than 3/3 configuration for two-string needs
• Higher value than 1/1 through dual-circuit capability
• Lower installation cost than separate combiner boxes
• Reduced wiring complexity to inverter(s)
• Single enclosure simplifies installation

Long-Term Value

• Better energy yield through orientation optimization
• Higher reliability reduces total cost of ownership
• Minimal maintenance downtime protects revenue
• Investment protection through flexibility
• Extended system lifetime through redundancy

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 both 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)
• Both surge protection devices tested per IEC 61643-31
• UV aging test for enclosure materials (1000 hours)
• Independent operation verification for both circuits

Manufacturing Excellence:

• ISO 9001:2015 certified manufacturing facility
• ISO 14001:2015 environmental management system
• Strict quality control procedures for dual-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 Dual-Circuit Installation:

• Mount in well-ventilated location with easy access for maintenance
• Ensure protection from direct sunlight, rain, and water accumulation
• Minimum clearance of 150mm on all sides for ventilation and access
• Consider cable entry paths from two different string locations
• Position for easy visual inspection of both SPD indicators
• Ensure sufficient space for future service access to individual circuits

Mounting Procedure:

• Use appropriate mounting hardware rated for enclosure weight (4.5kg + cables)
• Ensure level installation using spirit level
• Verify enclosure is securely fastened (minimum 4 fixing points)
• Maintain IP65 protection rating after installation
• Consider load distribution on mounting surface

Circuit Connection Sequence:

• Label both circuits clearly before connection (Circuit 1, Circuit 2)
• 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 and Circuit 2 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:

• Perform insulation resistance test on each circuit (minimum 200MΩ @ DC1000V)
• Verify insulation between circuits (minimum 200MΩ between circuits)
• Verify continuity of PE connection (common to both circuits)
• Check all mechanical connections for tightness in each circuit
• Confirm both 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

Safety Precautions:

Dual-Circuit Safety Considerations:

• Critical: Even with one circuit disconnected, the other circuit remains energized
• Never assume entire system is de-energized until BOTH circuits verified
• Use multi-point voltage testing on both circuits independently
• Implement lockout/tagout procedures with TWO SEPARATE LOCKS if working on both circuits

DC1000V Dual-Circuit Safety:

• Qualified personnel only – specialized dual-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 the other circuit to ensure it remains 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 both circuits for signs of damage or overheating
• Check both SPD indicators (green = OK, red = replace immediately)
• Inspect enclosure for cracks, damage, or compromised seals
• Verify cable glands maintain proper seal integrity on both circuits
• Check for any signs of moisture ingress
• Inspect each circuit’s fuse status visually
• Verify circuit separation barrier remains intact

Annual Maintenance:

• 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)
• 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:

• 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

Dual-Circuit Troubleshooting:

Symptom	Possible Cause	Solution
Circuit 1 no output, Circuit 2 OK	Circuit 1 fuse blown	Check/replace Circuit 1 fuses only, Circuit 2 unaffected
	Circuit 1 switch OFF	Turn Circuit 1 switch to ON
Both circuits no output	Common issue upstream	Check array-level connections
	Both switches OFF	Verify both 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, other continues 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
One circuit intermittent	Faulty component in intermittent circuit	Isolate and diagnose that circuit independently

Technical Comparison: VOPV1000 Series Configurations

VOPV1000-2/2 vs Other Models

Feature	VOPV1000-2/2	VOPV1000-1/1	VOPV1000-3/1	VOPV1000-3/3
Architecture	2 Independent Circuits	1 Circuit	3 Combined to 1	3 Independent Circuits
String Inputs	2	1	3	3
Outputs	2 Independent	1	1 Combined	3 Independent
Circuit Isolation	Complete between 2	N/A	None (combined)	Complete between 3
Enclosure Size	380x230x120mm	218x200x100mm	296x230x120mm	296x550x130mm
Switch Disconnectors	2 units	1 unit	1 unit	3 units
SPD Units	2 units	1 unit	1 unit	3 units
Fuse Holders	4 (2 per string)	2	6 (2 per string)	6 (2 per string)
Weight	~4.5kg	~2.2kg	~3.5kg	~6.5kg
Ideal System Size	10-15kW	5-8kW	10-15kW	15-25kW
Best Application	Dual-inverter, dual-MPPT, east-west	Simple single-string	Single inverter, multiple strings	Multiple inverters, maximum independence
Dual-Inverter Support	Excellent	No	No	Excellent (up to 3)
Dual-MPPT Support	Excellent	No	Limited	Excellent (up to 3)
East-West Optimization	Perfect	No	Possible but combined	Excellent (plus third orientation)
Cost Level	Medium	Low	Medium	High
Flexibility	High	Low	Medium	Very High
Maintenance Downtime	Minimal (50% capacity maintained)	Full system	Full system	Minimal (67-100% capacity maintained)

Choosing the Right Configuration

Choose VOPV1000-2/2 When:

• Using dual-inverter or dual-MPPT inverter system
• Installing east-west orientation array
• Need complete circuit independence for two strings
• Want optimal cost-performance for dual-circuit needs
• Require flexibility for phased installation (2 stages)
• Need 50% system operation during maintenance

Choose VOPV1000-1/1 When:

• Simple single-string system (5-8kW)
• Single orientation, single inverter
• Minimum cost priority
• Space constraints

Choose VOPV1000-3/1 When:

• Multiple strings to single inverter
• Single MPPT input inverter
• Cost optimization priority
• Not requiring independent circuit control

Choose VOPV1000-3/3 When:

• Three separate inverters or three-MPPT inverter
• Maximum flexibility and redundancy required
• Three different orientations
• Critical applications requiring maximum reliability
• Larger system size (15-25kW)

Why Choose VIOX VOPV1000-2/2?

Perfect Dual-Circuit Solution

• Two completely isolated circuits eliminate cross-circuit interference
• Optimal balance between independence and cost-effectiveness
• Ideal for most dual-orientation and dual-inverter applications
• Continue operation at 50% capacity if one circuit experiences issues

East-West System Excellence

• Purpose-built for east-west solar arrays
• Maximizes daily energy production profile
• Reduces grid stress with extended generation curve
• Optimal solution for grid-friendly solar installations

Dual-Inverter & Dual-MPPT Optimization

• Direct connection to two separate string inverters
• Perfect for dual-MPPT inverter systems
• Independent optimization per orientation
• Better performance than combined configurations

Superior Cost-Performance Ratio

• More economical than 3/3 for two-circuit needs
• Higher value than 1/1 through dual capability
• Optimal component count for dual-circuit architecture
• Best balance of features and cost

Professional Engineering

• VOAT-18 enclosure efficiently accommodates dual circuits
• Optimized internal layout with clear circuit separation
• Premium components rated specifically for DC1000V applications
• Enhanced insulation coordination for long-term reliability

Operational Excellence

• Individual circuit control enhances flexibility
• Simplified maintenance with per-circuit switches
• Reduced downtime through fault isolation
• Phased commissioning capability

Long-Term Value

• Higher reliability through dual protection systems
• Better energy yield through orientation optimization
• Lower total cost of ownership
• Investment protection through flexibility
• Extended system lifetime through redundancy

Get in Touch

Ready to optimize your dual-orientation or dual-inverter solar installation with the VOPV1000-2/2 Solar Combiner Box? Contact VIOX Electric today for:

• Detailed technical specifications and CAD drawings
• Dual-inverter and dual-MPPT system design consultation
• East-west orientation system optimization guidance
• Independent dual-circuit configuration recommendations
• Competitive pricing and MOQ (Minimum Order Quantity) information
• Custom configuration options for specific project requirements
• Sample orders for testing and evaluation
• Bulk order quotations with volume discounts
• Delivery timeline and international logistics support
• Specialized installation training for 2/2 independent configuration
• Product certifications and compliance documentation
• Integration support for dual-inverter systems
• String-level monitoring system recommendations