Sigenergy has recently confirmed that both single-phase and three-phase inverters now support expanded PV array oversizing ratios, provided all datasheet parameters—especially open-circuit voltage (VoC) and short-circuit current (Isc)—are strictly adhered to. This change provides greater flexibility in system design, enabling even higher energy harvest and improved return on investment for customers. View Sigenergy oversizing declaration
Previously, the recommended maximum oversizing ratio for Sigenergy single-phase inverters was capped at 200% (2:1 DC-to-AC ratio), while three-phase inverters were limited to 160%. However, Sigenergy has now confirmed that both single-phase and three-phase models can exceed these ratios, as long as the system remains within the inverter’s specified VoC and Isc thresholds. This means installers can design systems with higher DC capacity, increasing energy yield during suboptimal conditions such as early mornings, evenings, and cloudy days.
Expanded Design Flexibility and Performance Optimisation
For single-phase inverters, this expanded capability allows installers to push the DC-to-AC ratio well beyond 2:1, maximising production even when the inverter is not operating at peak efficiency. Similarly, three-phase inverters can now be oversized beyond the previous 160% limit, offering greater flexibility for larger commercial and residential projects.
It is crucial, however, to always consult the specific inverter’s datasheet and ensure that the array open circuit voltage and short circuit current do not exceed the inverter’s maximum ratings. Exceeding these parameters could lead to equipment damage or void warranties. Installers should also verify local grid requirements and ensure compliance with all relevant regulations, as some DNSPs may impose additional restrictions on oversized systems.
Here’s an example of the difference using a panel:
Comparative Oversizing Limits by Controller Model
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