Definition
Inverter Loading Ratio (ILR) is the ratio of installed DC array capacity (kW_DC) to inverter AC capacity (kW_AC). Equivalent term to AC/DC Ratio or DC:AC ratio. Typical 1.10–1.40 depending on site and inverter.
Key Takeaways
- ILR = kW_DC / kW_AC.
- Synonymous with AC/DC ratio.
- Typical 1.10–1.40 depending on site.
- See AC/DC Ratio for full design treatment.
Frequently Asked Questions
2 commonly searched questions about Inverter Loading Ratio.
What is ILR?
Inverter Loading Ratio = kW_DC / kW_AC. Same as DC:AC ratio. Typical 1.10–1.40.
Why is ILR > 1?
Modules rarely produce STC nameplate in real conditions. Oversizing DC captures more morning/evening energy at minimal midday clipping cost.
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