Belgium is three solar markets wearing one flag. Flanders abolished the spinning-meter arrangement and moved to a capacity-based network tariff. Wallonia runs its own prosumer tariff and green certificate history. Brussels operates a green certificate scheme of its own. The federal layer, Synergrid’s C10/11 prescription and the AREI installation regulations, is shared. An installer working across regions is running three economic models against one technical standard, and no design platform knows that.
Direct answer. The best solar design software in Belgium for most installers is SurgePV for commercial work and a Belgian or Dutch market tool for domestic, because the technical standard is federal but the economics are regional. Synergrid C10/11 governs parallel grid connection and AREI governs the installation, and no international platform templates either natively, so editable CAD output is what matters.
TL;DR
- Technical rules are federal: Synergrid C10/11 for parallel connection, AREI/RGIE for the installation itself.
- Economics are regional. Flanders, Wallonia, and Brussels each have their own support and tariff arrangements.
- Flanders moved to a capacity-based network tariff, which penalises high peak draw and changes the battery case.
- The digital meter rollout ended the spinning-meter benefit in Flanders, pushing design toward self-consumption.
- Inverter compliance with C10/11 must be verified. A unit acceptable elsewhere in Europe is not automatically listed here.
What Belgium Actually Changes About Solar Design Software
Two federal technical documents. Synergrid, the federation of Belgian network operators, publishes prescription C10/11 covering the parallel operation of decentralised production units with the distribution network. It sets protection, disconnection, and inverter compliance requirements. Separately, the AREI, known as the RGIE in French, governs electrical installations generally. An installation is verified by an accredited inspection body before energisation. Neither document is templated in any international design platform.
Three regional economies. Flanders, served by Fluvius, moved to digital meters and away from the spinning-meter arrangement, and introduced a capacity component in the network tariff based on monthly peak draw. Wallonia, served principally by ORES and RESA, applies its own prosumer tariff arrangement. Brussels, served by Sibelga, has operated a green certificate scheme. A design that pays back well in one region may not in another, on identical hardware.
Capacity tariff changes the design. Where the network tariff includes a capacity component keyed to peak demand, reducing peak draw has value independent of energy saved. That strengthens the case for storage and for load management, and it means the design conversation extends beyond the array.
Self-consumption became the point. With the spinning-meter benefit gone in Flanders, exported energy is worth far less than consumed energy. Array sizing follows consumption rather than roof area, and hourly modelling becomes necessary rather than optional.
Inverter listing matters. C10/11 compliance for the inverter and its protection functions has to be confirmed. Equipment libraries in international tools are populated for other markets, and an unlisted unit creates a problem at inspection rather than at design.
The Platforms Ranked for Belgium
| Platform | Best for | Hourly self-consumption | Editable CAD output | Price per seat per year |
|---|---|---|---|---|
| SurgePV | Commercial layouts, SLD, proposal | Yes, 8,760-hour | DXF and DWG | $1,299 to $1,899 |
| PVsyst | Financed and larger commercial | Yes | No | ~$500 |
| HelioScope | Fast commercial rooftop layouts | Yes | DXF only | ~$1,188 |
| Belgian and Dutch market tools | Domestic workflow | Yes | Limited | Subscription, EUR |
| OpenSolar | Low-volume domestic | Yes | No | $0 plus transaction fees |
| Aurora Solar | Larger commercial-facing teams | Yes | Limited | $1,908 to $3,108 |
| AutoCAD | Final sets to Belgian conventions | Not applicable | Native | ~$2,030 |
SurgePV fits Belgian commercial work: hourly generation and self-consumption modelling, string design, single-line diagram, and editable DWG a Belgian designer corrects to AREI and C10/11 conventions before inspection.
PVsyst remains the model Belgian lenders accept on financed projects, and its hourly output supports capacity-tariff analysis. See PVsyst price.
HelioScope is the fastest commercial layout engine. See HelioScope pricing.
Try the software behind this guide
Model self-consumption, then export a DWG for inspection
SurgePV gives you 3D layout, 8,760-hour generation and self-consumption modelling, string design, single-line diagrams, and editable AutoCAD DWG export from one license.
Book a free SurgePV demo →No credit card. 20-minute walkthrough on one of your own projects.
What a Belgian Design Package Has to Contain
- Layout with module positions, orientation, and roof attachment detail.
- Single-line diagram with protection and disconnection arrangements meeting Synergrid C10/11.
- Inverter compliance evidence confirming the unit and its protection functions are acceptable under C10/11.
- Installation documentation consistent with AREI/RGIE requirements for inspection by an accredited body.
- Grid operator notification to the relevant distribution operator, Fluvius, ORES, RESA, or Sibelga.
- Self-consumption modelling hourly, with the regional tariff arrangement applied.
- Structural assessment of the roof and mounting system.
Item 3 catches installers importing equipment on price. C10/11 listing is not a formality, and an unlisted inverter surfaces at inspection when the array is already on the roof.
Pricing in Euro
| Stack | Annual cost | Covers |
|---|---|---|
| OpenSolar | €0 plus fees | Basic domestic design |
| PVsyst | ~€460 | Yield modelling |
| HelioScope | ~€1,093 | Commercial layout and yield |
| SurgePV | ~€1,195 to €1,747 | Layout, SLD, DWG, proposal |
| Aurora | ~€1,755 to €2,859 | Proposal-led stack |
Converted at an illustrative 0.92.
What Most Belgian Installers Get Wrong
They carry one economic model across all three regions.
A team based in Flanders that starts taking work in Wallonia or Brussels frequently applies the Flemish tariff logic to a customer under a different regional arrangement. The technical design is fine, the payback figure is not, and the customer finds out from their first annual settlement. The fix is to hold three financial templates and pick by the customer’s distribution operator, not by proximity to the office.
The second mistake is ignoring the capacity component of the Flemish network tariff. Where peak draw is charged, a battery or a load-shifting strategy can be worth more than additional panels, and a design conversation that only discusses array size misses it.
When Software Is Not the Answer
If the constraint is establishing whether an older commercial roof can carry an array at all, that is structural engineering, not design software.
Our solar civil and structural engineering team handles it, with calculations delivered as STAAD Pro report calculations, alongside solar rooftop detailed engineering design for the full construction pack. See the sample design pack or talk to our team.
Conclusion
- Separate the federal technical rules from the regional economics. C10/11 and AREI are national. The payback model is not.
- Verify C10/11 inverter listing before ordering. It is an inspection gate, not a formality.
- Model peak demand where a capacity tariff applies. Reducing peak can beat adding panels.
In this country series: solar software in Belgium, best solar proposal software in Belgium, shading analysis software in Belgium, Aurora Solar review. Tool deep dives: Opensolar review, Pvsol review.
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Disclosure and accuracy note
Commercial relationship. Heaven Designs and SurgePV are part of the same group. Treat our recommendation of SurgePV as a vendor making its own case, not an independent verdict. We have tried to describe every other product fairly, and to say plainly where a competitor is the better choice.
Pricing. All prices are indicative, compiled from public sources when this page was written. They vary by tier, region, contract term and exchange rate, and change without notice. Several vendors quote rather than publish, and some price in currencies other than the US dollar, so a converted figure moves with the exchange rate. Confirm current pricing with the vendor before you decide anything.
Trademarks and corrections. All product names and trademarks belong to their respective owners, and are used here for identification and comparison only. Their use does not imply affiliation with or endorsement by those companies. If anything here is out of date or wrong, tell us and we will correct it.
FAQ
What is the best solar design software in Belgium? SurgePV for commercial layouts, single-line diagrams, and editable DWG, with a Belgian or Dutch market tool for domestic workflow. PVsyst alongside either for financed projects.
What is Synergrid C10/11? The prescription covering parallel operation of decentralised generation with the Belgian distribution network, setting protection, disconnection, and inverter compliance requirements. It applies nationally.
How do Flanders, Wallonia and Brussels differ? The technical rules are shared, but support schemes and network tariffs are regional. Flanders uses digital meters and a capacity-based network tariff, Wallonia applies its own prosumer arrangement, and Brussels has operated a green certificate scheme.
Does the digital meter change the design in Flanders? Yes. With the spinning-meter benefit gone, exported energy is worth much less than consumed energy, so arrays should be sized against consumption and hourly self-consumption modelling becomes necessary.
Does any software support AREI or C10/11 natively? No mainstream international platform does. Pick a tool with editable CAD output so a Belgian designer can correct the drawings before inspection.
How much does solar design software cost in Belgium? From €0 with OpenSolar to roughly €2,900 per user per year for a proposal-led stack. Full math is in our solar design software pricing breakdown.
What about proposal software specifically? Covered in best solar proposal software in Belgium.
What about shading analysis specifically? Shading is a separate tool decision at Belgium’s latitude and approval regime. Covered in best solar shading analysis software in Belgium.
