Underperformance means that the measured solar production is less than the expected solar production.
Some systems will be slightly above or slightly below 100%, even when everything is operating ideally. This is due to small variations in the system design and components, which can differ slightly from manufacturer’s specifications and from model assumptions as well as day to day variations in the accuracy of weather data.
Causes of solar system under-performance:
- panel faults
- inverter faults
- string fault
- wiring faults
- system design faults
- monitoring installation faults (phase rotation issues, loose CTs, device faults)
- incorrect system specifications
- extreme shading
- seasonal change (Autumn and Winter Shading)
- dirty panels
Just Started with Solar Analytics Monitoring?
Often in the first weeks after monitoring begins, systems can appear to be underperforming, while our algorithms learn about your system from the measured data. The performance should be more accurate and reliable after about two weeks.
What can you do about this?
If your solar system is under-performing, the first thing we recommend is to check whether your solar panels are shaded. For more information about shading, please visit: Extreme Shading and Autumn and Winter Shading.
In the event of any Underperformance in your solar energy system, Solar Analytics will notify you via email and the dashboard to advise you of the recommended course of action to resolve the problem.