Comparison
Ritwerk and Solarius PV, side by side.
Solarius PV is ACCA software’s PV design program for Windows, with Italian climate data, quotes and a bill of quantities. The designer runs in the browser and calculates the yield with PVGIS.
Updated
What Solarius PV is
Solarius PV comes from ACCA software in Italy and runs only on Windows 64-bit. ACCA aims the program at designers of all kinds of PV systems, on new and existing buildings and also large plants. Projects can be shared via ACCA’s cloud platform usBIM.
The terrain can be imported from Google Maps, and the system is modelled in 3D with BIM. The Italian page gives climate data to UNI 10349 and ENEA for Italy and PVGIS for the rest of Europe, and the English page also mentions Meteonorm. The technical report is available in Italian, English, Spanish, French and Portuguese.
Side by side
| Ritwerk | Solarius PV | |
|---|---|---|
| Runs in | The browser, on a computer and iPad, with no account | Windows 64-bit, subscription by number of computers |
| Components | Register of 570 products (120 panel models, 415 inverters, 35 batteries) from many manufacturers, with product sheets and datasheets; you can add your own panels | Thousands of models, batteries from several brands |
| Base data | Aerial imagery from Esri; the outline is traced on the photo and Inner edges raises the roof in 3D | Terrain model from Google Maps, 3D modelling in BIM |
| Shading | The sun’s path every month plus sky view, at nine points per panel; the loss per panel | Between panel rows, nearby obstacles in 3D, horizon from a photo, distant obstacles |
| Strings | Longest strings within Voc at −25 °C, Vmp at 70 °C and the current per MPPT, with an explanation | Number of strings and modules per string, check of compatible inverters |
| Yield data | PVGIS 5.3 from the European Commission, simulated hour by hour | UNI 10349 and ENEA for Italy, PVGIS; the English page also mentions Meteonorm |
| Mounting and loads | Snow and wind loads to the Swedish BFS 2024:6 in the designer: zones, fixings and largest c/c spacing for 12 systems from Nordmount, SOLTOP and Weland; ballast in the manufacturer’s software | Not stated |
| Battery | Battery sizing tests every size hour by hour; control by hourly price in SE1–SE4 | Battery and self-consumption; EV: not stated |
| For the customer | PDF report in A4 at three levels, with a 3D view, strings, yield, shading and economics | Financial report, quote and bill of quantities |
| Interface | Swedish, English and German | Not stated; the report in Italian, English, Spanish, French and Portuguese |
| Price | Designer at no cost; Pro €49 per user per month excl. VAT, with volume discount (pre-order) | €599 on the Italian page; VAT and licence type not stated |
The details on Solarius PV come from the vendor’s own pages and were checked on 14 November 2026; the sources are listed at the end of the page. "Not stated" means the detail could not be verified there. The Ritwerk column describes the designer as it is today.
When Solarius PV is the better fit
For design work in Italy. Climate data to UNI 10349 and ENEA for the whole of Italy is built into the program, and it produces a financial report, a quote and a bill of quantities for the system.
Solarius PV also calculates shading from distant obstacles and from the horizon taken from a photo, as well as shading between panel rows. The project can be shared with others via ACCA’s cloud platform usBIM.
When Ritwerk is the better fit
When the design is to be done in the browser, on a computer or iPad, with no installation and no account. The designer draws the roof from the outline of the house on the aerial photo and raises it in 3D with Inner edges, checks the strings at −25 °C and 70 °C, and calculates snow and wind loads for the mounting.
The yield comes from PVGIS 5.3 and is set against the customer’s consumption hour by hour. The interface is available in Swedish, English and German, not in Italian.
The irradiance map on the roof
The irradiance map in step 5 shows how much sun each part of a roof face receives over the year, in squares of 25 × 25 centimetres. The value is relative to an unshaded south-facing surface at a 35-degree tilt, so you can see where the panels do most good and where a dormer or chimney takes the light.
Sources
- ACCA software – Solarius-PV (Italian) – checked 14 November 2026
- ACCA software – Solar design software (English) – checked 14 November 2026
- ACCA software – Solarius PV, subscription plans – checked 14 November 2026
Questions and answers
Questions and answers
What does Solarius PV cost?
ACCA’s Italian page shows 599 euros but does not say whether the amount is for a licence or a subscription, or whether VAT is included. The purchase includes four months of POWER PACK. The English page lists subscriptions per month, per year or longer without amounts, and a 30-day trial.
Is Solarius PV available for Mac?
ACCA states that Solarius PV runs only on Windows 64-bit.
Which climate data does Solarius PV use?
The Italian page gives UNI 10349 and ENEA for Italy and PVGIS for Europe, Africa, the Mediterranean and south-west Asia. The English page also mentions Meteonorm for locations worldwide.
Does Ritwerk have an Italian interface?
No. The designer’s interface is available in Swedish, English and German.
Read next
- The roof in 3DOutline on aerial imagery, Inner edges and the ridge in 3D – gable, hipped, mansard, flat and your own roof lines.
- Shading analysis per panelSun path, sky view and shading loss per panel – with dormers, chimneys, trees and walls.
- PDF customer reportCover with a 3D view, plan drawing, shading, yield and economics – short, standard or full.
Try it on a real roof.
The designer opens in your browser, with no account. Search for an address and start drawing.