Hybrid solar component guide
ACDB / DCDB Protection
Coordinated isolation and fault protection on the solar, grid, battery and backup paths.
AC and DC protection assemblies organize isolators, overcurrent devices, surge protection and circuit labeling. A hybrid system has more power paths than a basic grid-tied system, so device ratings and selectivity must follow the final single-line design.
Design
Size from real site and load inputs
Compatibility
Verify every connected device and power path
Handover
Record settings, tests, warranties and maintenance
Role in the Hybrid System
What this component does and why the complete system depends on it.
- Isolate PV, inverter, grid and backup circuits for safe service.
- Protect conductors and equipment from overload and short-circuit conditions.
- Limit transient overvoltage through correctly selected surge-protection devices.
- Create a clear, labeled protection boundary around the hybrid equipment.
Selection and Sizing Checks
The technical inputs to verify before choosing a model or capacity.
- Maximum PV string voltage and current, including design margins.
- Inverter AC input, normal output and backup-output ratings.
- Battery-circuit voltage, current and manufacturer-required protection.
- AC and DC breaking capacity, device polarity and utilization category.
- SPD type, maximum continuous operating voltage, protection level and earthing path.
- Indoor or outdoor enclosure IP rating, cable entries and thermal loading.
- Protection coordination with the existing main distribution board.
Hybrid Integration
Compatibility and operating details across solar, battery, grid and backup paths.
- DC-rated devices must be used on DC circuits; similar-looking AC devices are not interchangeable.
- Normal-grid output and backup output may require separate protection paths.
- The energy meter and control circuits should match the approved export-control architecture.
- Battery isolation and overcurrent protection must follow both battery and inverter instructions.
- Device placement should support a clear shutdown sequence for owners and service personnel.
Installation and Safety
The installation controls that protect people, equipment and the property.
- Use correct cable glands, conductor terminations, torque values and ferrules or lugs.
- Keep polarity, phase, neutral and earth identification consistent.
- Minimize SPD conductor length and connect to an effective earthing system.
- Label every source because PV and batteries can remain energized when the grid is off.
- Inspect enclosure sealing, heat dissipation and access before energization.
Documents and Handover
Records the customer should receive for operation, warranty and future service.
- Final single-line diagram and protection-device schedule.
- MCB, fuse, isolator, RCCB/RCBO and SPD ratings.
- DB photographs, circuit labels and isolation sequence.
- Continuity, polarity, insulation and functional test records as applicable.
- Replacement guidance for operated or failed surge-protection devices.
Maintenance and Ownership
Practical checks that support safe operation and dependable long-term performance.
- Inspect for discoloration, heat marks, corrosion, water entry and loose connections.
- Check SPD status indicators after storms or known surge events.
- Keep labels legible and enclosures accessible.
- Reassess ratings when inverter, battery, PV strings or backup circuits are expanded.
Site-specific design required
Final selection should follow the site survey, load and outage profile, equipment datasheets, compatibility lists, warranty terms, utility requirements and applicable electrical-safety rules.