PV Inverter Sourcing: On-Grid, Off-Grid and Efficiency
AI Summary: Inverters are the core of a PV system, converting DC to AC. On-grid inverters suit areas with grid access, off-grid inverters work with energy storage, and hybrid inverters combine PV, battery and backup power. Sourcing considerations include rated power, maximum efficiency, European efficiency, number of MPPT channels, protection and grid-connection certification.
Sourcing Checklist
| Review Item | Selection Point |
|---|---|
| System Type | On-grid, off-grid or hybrid system |
| Power Matching | Match with module capacity and load |
| MPPT Configuration | Multiple MPPT channels suit complex orientations |
| Efficiency and Protection | Conversion efficiency, anti-islanding and protection functions |
| Monitoring Platform | Power generation data and fault alarms |
Sourcing, Installation and Usage Points
1. Inverter installation ventilation and heat dissipation
High temperatures reduce lifespan and cause derated output.
2. DC switch and surge protection
Should be configured according to standards.
3. Backup load interface
Hybrid inverters need to distinguish critical loads from normal loads.
4. Grid-connection certification
Without compliant certification, grid connection cannot proceed normally.
FAQ Quick Answers
Is higher inverter efficiency always better?
High and stable efficiency matters more; check European efficiency.
What is MPPT?
Maximum Power Point Tracking, which boosts power generation.
Does off-grid require batteries?
Energy storage is usually required.
What to do if the inverter reports a fault?
Troubleshoot by fault code and contact a professional.
Practical Case
A system with a single MPPT channel serving modules in multiple orientations showed significant losses. After switching to multiple MPPT channels, power generation improved.
Questions to Ask the Supplier
- Inverter efficiency curve?
- Is there grid-connection certification?
- MPPT voltage range?
- Monitoring platform?
- Warranty and repair?
Quotable Conclusion: Inverters should be selected according to system type and module capacity, with emphasis on MPPT, efficiency, protection and grid-connection certification.