From records to a model.
From the model to numbers.
- Records
Documents, a roof image, or just the production record.
- Geometry
Surfaces, tilt, orientation and string layout.
- Sun and weather
Sun position and irradiance for every hour.
- Calculation
What each string should produce.
What Parhelion watches.
Without a sensor on the roof.
100 m© ČÚZKFrom photon to kilowatt-hour.
Six steps, every hour.
The gap is the diagnosis.
One plant, one week.
Sample data.
Every fault leaves a fingerprint.
A slow decline that rain wipes away.
A drop, then a flat line.
A dip at the same hour every day.
Faster decline than the manufacturer promises.
Zero, then a gradual return.
A clipped peak. Not a fault.
Short dips that keep getting worse.
The loss grows with temperature.
A neural network that looks ahead.
It forecasts output and where a loss is heading.
- Output tomorrow1,310 kWh
- Loss in 30 days0.1%
- Loss in 90 days0.2%
- Loss in 180 days0.3%
An illustration of three sample situations: a clear day, panels slowly getting dirtier and a cloudy tomorrow. The forecast error was measured on the first real plant.
It finds the fault.
And doesn’t report ones that aren’t there.
No documents. No history. Not a single false alarm.
- 0
- false findings
- 371 of 400
- injected faults found
- 96 of 96
- step losses of 2% or more
- 7 days
- median time to find a step fault
- 29° · 206°
- tilt and azimuth from the record alone
- 87 °C
- the inverter throttled itself. Not reported as a fault.
Blind-tested on 1,500 simulated plants under real measured skies (47,914 plant-years) and on one real 10 kW GoodWe plant with 400 injected faults. We are now confirming real faults on real plants in the pilot programme.
A model you can work with.
Move the sun. Hover over a panel.
- Panels in the model
- 1,558
- Installed capacity
- 686 kWp
- Production forecast
- 24 h
- Skylights and obstacles
- 15
Don’t take our word for it.
Run the numbers.
Sample 250 kWp plant
A factory roof, 5 years in service, one faulty string and dirty panels.
A simplified illustration with sample prices: 1,050 kWh per kWp a year, energy worth €0.11/kWh, panels €760/kWp, storage €440/kWh. In the portal, the simulation runs on the digital twin of your own plant.
Three steps.
No new hardware.
- Week 1
We connect the data
Read access to the inverter portal.
- Weeks 2 to 4
Parhelion builds the twin
It learns how your plant runs.
- Then ongoing
You get decisions
Findings, losses in money, forecasts.
Parhelion and ordinary monitoring.
Monitoring is a thermometer. Parhelion is a diagnosis.
What people ask us.
Do we need to install anything for Parhelion?
No. Parhelion works with the data your plant already collects and with public weather data. An on-site sensor is not required. If data is missing or too coarse, we tell you up front and suggest what to add.
How accurate is the model?
Blind-tested on 1,500 simulated plants under real measured skies, Parhelion found 91% of faults with 4.8% false alarms, and 98.6% of its findings pointed to the right string. On the first real plant it reported not a single false finding, and its next-day forecast error was 11% of installed capacity, half that of going by yesterday. We are now confirming real faults on real plants in the pilot programme.
Does it work with our inverter?
Parhelion works with production records from manufacturer portals and data loggers. Our GoodWe connection is proven on a real plant; other brands connect through their portal or an export. We confirm the exact route in the first demo.
We have no technical documents. Is that a problem?
No. Parhelion works out the tilt, orientation and size of the plant from the production record. On the first real plant that was a 29° tilt, 206° azimuth and 10.4 kWp, without a single document. Documents make the model more precise, but you can start without them.
Who will see our data?
Only authorised people on the Sunalytiq team and those you give access to. We never sell data, and a contractor receives only the description and location of the fault. Details are in our privacy policy.
What does it cost?
In the pilot programme you pay nothing for Parhelion or for our work. We propose a price for working together afterwards, based on the results on your plant, and you are free to stop.
Parhelion
See the twin of your own plant
In the pilot programme we build the Parhelion of your plant and walk you through the first findings.
- No new hardware
- Free pilot
- Stop any time