Inverter DC/AC Ratio Checker
Match inverter to array & avoid clipping losses
Free · No sign-up · Computed instantly on your device
Array & Inverter
Check whether your inverter is matched to the DC array — or let the tool recommend a size.
Recommended inverter for a 10 kWp array
7.7 – 9.1 kW
Sweet spot ≈ 8.3 kW (DC/AC 1.2)
Optimal DC/AC ratio for Indian rooftops is 1.1–1.3. Some DC oversizing is desirable — it fills the inverter across more of the day. Confirm the specific inverter’s max DC input rating before finalising.
DC / AC ratio
1.25
Well-matched. Minimal clipping, strong energy harvest across the day.
Where you sit on the scale
About This Calculator
The DC/AC ratio (also called the inverter loading ratio) is the quiet decision that shapes a plant’s economics. Because modules rarely deliver nameplate power — temperature, soiling, and morning/evening sun see to that — a correctly designed system oversizes the DC array relative to the inverter. For Indian conditions, the sweet spot is a ratio of 1.1–1.3.
Undersize the array and you pay for inverter capacity that never fills; oversize aggressively past ~1.4 and midday clipping starts discarding real energy. This tool grades your ratio on that scale and, given any array size, recommends the inverter band that keeps you in the optimal zone.
How the Calculation Works
The DC/AC ratio (also called inverter loading ratio) is array size in kWp divided by inverter rating in kW. Indian rooftop designs usually oversize the array to 1.1–1.3 times the inverter because modules rarely deliver nameplate power, so the inverter runs closer to full load for more hours. Go much past about 1.4 and the inverter clips midday peaks.
The checker shows your ratio, a verdict, and the inverter range that would put a given array in the sweet spot. Real products set their own limits — the Growatt MIN 5000TL-X accepts 7,000 W of PV on 5,000 W (1.4:1) — see the DC/AC ratio entry.
Worked example
- A 5.5 kWp array on a 5 kW inverter is a ratio of 1.10; on a 4.5 kW inverter it is 1.22.
- For a 6 kWp array, the 1.1–1.35 band corresponds to an inverter of roughly 4.4 to 5.5 kW.
Go Deeper
Frequently Asked Questions
- Is Clipping Always Bad?
- No — small amounts of midday clipping (a ratio up to ~1.3) are usually profitable, because the oversized array generates more during the many hours the inverter is not at its limit. It becomes a problem when clipping losses exceed the value of the extra DC capacity.
- What DC/AC Ratio Do Subsidised Residential Systems Use?
- Under net-metering rules, the sanctioned capacity is usually the inverter (AC) rating, so Indian residential systems commonly run ratios of 1.0–1.2. Confirm your DISCOM’s sanctioning basis before oversizing.
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