Spanish solar sells itself on sunshine and then disappoints on arithmetic. The resource is excellent, but the surplus compensation rate is modest, the household that is out all day cannot use the midday peak, and the municipal tax rebates that improve the case vary from town to town. A proposal that leads with generation rather than with savings is setting up a customer to be unhappy.
Direct answer. The best solar proposal software in Spain for most installers is a Spanish-market tool for domestic autoconsumo, because it handles compensacion simplificada and collective self-consumption allocation natively, or SurgePV for commercial work where the proposal also carries the layout and single-line diagram. Municipal IBI and ICIO rebates are local and belong in the model manually.
TL;DR
- Surplus is credited under compensacion simplificada at well below retail, so self-consumption carries the payback.
- Spanish tariffs are time-banded, so when the customer uses power matters as much as how much.
- Collective self-consumption needs allocation coefficients modelled, not just total generation.
- IBI and ICIO municipal rebates vary by town and can materially improve the case. Check the specific municipality.
- Commercial customers with daytime load are a far better fit than empty-by-day households.
What Spain Actually Changes About Proposal Software
Surplus is worth much less than consumption. Under compensacion simplificada, exported energy is credited against the customer’s bill at a rate substantially below the retail price, and the credit cannot exceed the bill. That caps the value of a large surplus and makes the self-consumption share the number the proposal turns on.
Tariffs are time-banded. Spanish electricity tariffs distinguish peak, flat, and off-peak periods across the day and week. The value of a self-consumed kilowatt-hour depends on which band it displaces. Modelling against a single blended rate loses that, and it usually understates the benefit of midday generation for a commercial customer while overstating it for a residential one.
Collective self-consumption needs allocation modelling. Where an installation serves several nearby consumers under autoconsumo colectivo, each participant receives a share defined by an allocation coefficient. The proposal has to show each participant’s own economics, not the installation’s aggregate, which is a genuinely different document.
Municipal rebates are local. Many Spanish municipalities offer reductions on the IBI property tax and the ICIO construction tax for solar installations. The amounts and durations differ by town, and no software carries a national database of them. Checking the specific municipality is manual work that materially improves the proposal.
Daytime load is the qualifier. The strongest Spanish solar customers are businesses that operate during daylight. For a household empty from nine to six, most of the midday peak is exported at a modest credit, and the honest proposal reflects that with a smaller system or storage.
The Platforms Ranked for Spain
| Platform | Best for | Time-banded tariffs | Collective allocation | Design output | Price per seat per year |
|---|---|---|---|---|---|
| Spanish market tools | Domestic autoconsumo | Native | Often native | Layout | Subscription, EUR |
| SurgePV | Commercial proposals plus design | Configurable | Via hourly output | Full, with DWG | $1,299 to $1,899 |
| PVsyst | Financed and larger commercial | Manual | Via hourly output | Yield only | ~$500 |
| HelioScope | Commercial layout and yield | Manual | Manual | Layout only | ~$1,188 |
| OpenSolar | Low-volume domestic | Configurable | Manual | Basic | $0 plus transaction fees |
| Aurora Solar | Larger commercial-facing teams | Configurable | Manual | Good | $1,908 to $3,108 |
| Spreadsheet over tool output | Collective and bespoke cases | Manual | Fully manual | None | Time |
Spanish-market tools are the better domestic fit because they model compensacion simplificada and often collective allocation directly.
SurgePV suits commercial work, producing hourly generation against load, the string design, the single-line diagram, and the customer document from one model. Technical detail in best solar design software in Spain.
PVsyst supplies the hourly series and the report Spanish lenders accept. See PVsyst price.
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SurgePV models 8,760 hours of generation against the load so each tariff band is valued properly, and emits the single-line diagram plus a white-label proposal from one model.
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What a Spanish Proposal Has to Contain
- System specification with modules, inverter, and kWp.
- Generation forecast with the data source named.
- Self-consumption share modelled hourly against the customer’s load and tariff bands.
- Surplus treatment under compensacion simplificada, with the credit rate and the bill cap explained.
- Tariff analysis by time band, showing which bands the generation displaces.
- Allocation coefficients and per-participant economics for collective self-consumption.
- Municipal rebates for the specific town, IBI and ICIO, with the amount and duration.
- Legalizacion timeline for the relevant autonomous community.
- Assumptions for price escalation and degradation.
Item 4 has a detail installers frequently omit: the surplus credit cannot exceed the customer’s bill. For a low-consumption household with a large array, that cap binds, and a model that credits all surplus is wrong.
Pricing in Euro
| Stack | Annual cost | Covers |
|---|---|---|
| OpenSolar | €0 plus fees | Domestic proposal |
| PVsyst | ~€460 | Hourly yield, no proposal |
| HelioScope | ~€1,093 | Commercial layout and yield |
| SurgePV | ~€1,195 to €1,747 | Proposal plus design and SLD |
| Aurora | ~€1,755 to €2,859 | Proposal plus design |
Converted at an illustrative 0.92.
What Most Spanish Installers Get Wrong
They sell generation and the customer buys savings.
A Spanish proposal headlining a large annual kilowatt-hour figure is emphasising the thing Spain is good at rather than the thing the customer will experience. For a household out during the day, a big generation number and a small saving sit side by side, and the customer notices the second one. The stronger sales position is to lead with the self-consumption share, explain why it is what it is, and recommend the system that maximises it.
The second mistake is skipping the municipal rebate check. IBI and ICIO reductions vary by town and can be worth a meaningful share of the system cost. Fifteen minutes checking the municipality is often the highest-return work in the whole proposal.
When Proposal Software Is Not the Constraint
Spain’s larger opportunities are commercial rooftop and ground-mount, and those turn on engineering capacity rather than proposal quality.
Our solar rooftop detailed engineering design, solar ground mount design, and site survey and land feasibility services cover that work. See the sample design pack or talk to our team.
Conclusion
- Lead with the self-consumption share. It is what the customer experiences, and generation figures oversell.
- Model tariff bands, not a blended rate. Which band the generation displaces decides what it is worth.
- Check the municipality’s IBI and ICIO rebates. They vary by town and are frequently the cheapest improvement to the case.
In this country series: solar software in Spain, best solar design software in Spain, shading analysis software in Spain, Pvsol review. Tool deep dives: Pvcase review, Pvsyst 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 proposal software in Spain? A Spanish-market tool for domestic autoconsumo, because it handles compensacion simplificada and collective allocation natively, or SurgePV for commercial work where the proposal also carries the design.
How is surplus compensated in Spain? Under compensacion simplificada, exported energy is credited against the customer’s bill at a rate below retail, and the credit cannot exceed the bill. That cap matters for low-consumption households with large arrays.
Do Spanish tariff bands change the proposal? Yes. Spanish tariffs distinguish peak, flat, and off-peak periods, and the value of self-consumed energy depends on which band it displaces. A blended rate loses that.
What is different about a collective self-consumption proposal? Each participant needs their own economics based on their allocation coefficient and their own load, not a share of the installation’s aggregate figure.
Do IBI and ICIO rebates belong in the proposal? Yes, where the municipality offers them. Amounts and durations vary by town and no platform carries a national database, so this is a manual check worth doing.
How much does solar proposal software cost in Spain? From €0 with OpenSolar to roughly €2,900 per user per year at Aurora’s higher tiers. Cross-platform math is in our solar design software pricing breakdown.
What about the design software decision separately? Covered in best solar design software in Spain.
