Part of the complete guide: Maintenance & performance
If you look at your inverter app in July and panic, read this first. Generation follows the sky, and South Kerala has a clear pattern.
The pattern
| Months | What to expect |
|---|---|
| Dec – Feb | Clear skies, cool panels: excellent yield. |
| Mar – May | Longest days but hot panels: very good, with occasional pre-monsoon clouds. |
| Jun – Aug | Heavy cloud: output can fall to roughly half of a clear day. |
| Sep – Nov | North-east monsoon showers, mixed: moderate to good. |
The annual average works out to about 4 units per kW per day, which is the number our calculator uses.
When to worry
If the app shows output 15–20% below a similar clear day last year, the cause is usually dirt, shade growth or a tripped breaker, not weather. See the maintenance guide.
