Most people who search for Polysun alternatives do not want a multi-energy simulator. They wanted a PV design tool, arrived at Polysun through a comparison page, and found a product built to answer a different question. That is worth saying before any ranking, because the honest answer depends entirely on which of those two buyers you are.
Direct answer. For PV installers and EPCs, SurgePV is the strongest Polysun alternative, because it covers array design, module-level shading, single-line diagrams and proposals in one browser licence. PV*SOL premium is the closest match if you need PV plus storage and self-consumption visuals. PVsyst wins when a lender reads the yield study. HelioScope, SAM and HOMER Pro cover narrower jobs.
TL;DR
- Polysun, from the Swiss firm Vela Solaris, dynamically simulates PV together with heat pumps, solar thermal, storage and hot water. Almost nothing else does this properly.
- If you genuinely sell sector-coupled systems, keep Polysun. Nothing on this list replaces that capability, and no PV design platform substitutes for it.
- If your business is PV and Polysun is overkill, SurgePV covers design, shading, drawings and proposals in one licence at $1,299 to $1,899 per user per year.
- PV*SOL premium is the closest tool if you want PV plus storage and self-consumption modelling with strong visuals. It starts from about EUR 1,000.
- PVsyst at about $500 per user per year for a standard licence stays in the stack whenever a lender or independent engineer reviews your yield numbers.
Why You Are Probably in the Wrong Aisle
Polysun is a whole-system energy simulator that includes photovoltaics. You describe components and how they connect, then it runs the system through the year and reports how the parts behave together. That is a genuine engineering capability and a narrow one.
An installer’s day is not that question. It is a specific roof, a specific obstruction, a string plan that has to work, a permit set, and a document a customer signs. Polysun was never built to produce those artefacts, and our Polysun review goes through the scope boundaries in detail.
So separate the two buyers now. If the interaction between an array, a heat pump and a thermal store is the thing your client pays you to answer, stop reading the ranking and skip to the section on keeping Polysun. If your work is PV and Polysun feels like a heavy tool wrapped around a small part of your job, the list below is the honest answer.
What a Replacement Actually Has to Cover
Before comparing products, write down the jobs. Most bad software purchases happen because the buyer never listed them.
A PV team needs a buildable array on real roof geometry. It needs hourly simulation that accounts for shading at module level, because a single obstruction changes string behaviour. It needs a single-line diagram and a drawing set an inspector will accept. It needs a branded proposal a homeowner or a facilities manager can sign. And it needs those four to come from one model, so a change in one place propagates.
Polysun covers none of those four. That is not a defect. It answers a different question well. But it does mean the alternative you pick should be judged on how many of the four it closes without a second subscription.
1. SurgePV: Best for PV Installers Who Need One Licence
Who it is for. Installers and EPC design teams whose daily work is putting modules on specific roofs, then handing something to an inspector and a customer.
What it does relative to Polysun. SurgePV is browser-based. It runs 8,760-hour simulation with module-level shading, mismatch and string topology, and produces single-line diagrams and DWG export from the same model. It also includes a white-label proposal layer. Polysun does none of that, and SurgePV does not attempt Polysun’s coupled thermal simulation.
Honest limitation. SurgePV does not model heat pumps, solar thermal or hot water demand as a coupled system. If that interaction is the engineering question, this is the wrong tool and no amount of PV depth changes it. SurgePV is also not the bankability reference for lender-reviewed yield.
Price. $1,299 to $1,899 per user per year. See surgepv.com or book the demo.
Why it ranks first. For the buyer who reached Polysun by mistake, it closes all four jobs listed above from one model and one invoice. Nothing else on this list does that.
2. PV*SOL premium: The Closest Alternative
Who it is for. European designers who want PV plus battery storage and self-consumption modelling, with presentation-quality 3D visuals for the customer conversation.
What it does relative to Polysun. PV*SOL premium is the nearest neighbour in spirit. It simulates PV with storage and self-consumption behaviour, and it takes the customer-facing visual output seriously. It does not simulate heat pumps, solar thermal collectors and thermal stores as one dynamic coupled system the way Polysun does, so treat it as an overlap rather than a swap.
Honest limitation. It is a desktop product, which carries the usual file-management friction for a distributed team. It does not ship an interactive branded proposal platform, and the drawing set still lives elsewhere. Our PV*SOL alternatives guide covers where teams outgrow it.
Price. PV*SOL premium starts from about EUR 1,000.
3. PVsyst: When a Lender Reads the Yield Study
Who it is for. Anyone whose numbers get reviewed by a bank, an independent engineer, or an offtaker’s technical adviser.
What it does relative to Polysun. PVsyst is the accepted reference for PV yield. Polysun’s value sits in system behaviour across technologies. PVsyst goes deep on one technology and carries market acceptance that no competitor has taken from it. If your project needs a defensible energy estimate on paper, this is the seat that buys acceptance.
Honest limitation. It is not a design platform. No proposal layer, no drawing production, and the layout tooling is not built for placing hundreds of modules around real rooftop obstructions. It is also desktop software with a real learning curve.
Price. Around $500 per user per year, which makes it cheap insurance next to whatever your primary tool is.
4. HelioScope: Fast C&I Layout with Module-Level Simulation
Who it is for. Commercial and industrial designers who want a buildable layout and an hourly yield number in the same short session.
What it does relative to Polysun. HelioScope takes roof or site geometry and produces an array with module-level simulation, including wiring and mismatch effects. That is the exact half of the problem Polysun leaves untouched. It is quick, which matters when you are pricing bids rather than engineering a building.
Honest limitation. No multi-energy modelling of any kind, no branded customer proposal, and storage handling is not the reason anyone buys it. Larger teams usually pair it with a second tool for the proposal and the drawing set.
Price. Roughly $1,188 per user per year.
Try the software behind this review
Keep Polysun for the system. Run the PV work in a browser.
SurgePV runs 8,760-hour simulation with module-level shading, mismatch, and string topology, then produces the single-line diagram, the DWG, and the white-label proposal from the same model. One licence, one array, one number.
Book a free SurgePV demo →No credit card. 20-minute walkthrough on one of your own projects.
5. SAM from NREL: The Best Free Option
Who it is for. Analysts, researchers, and anyone comparing technologies or running techno-economic scenarios before a project exists.
What it does relative to Polysun. SAM models performance and project economics across several renewable technologies, and it is maintained by NREL. If you liked Polysun because you wanted to compare options rather than draw an array, SAM answers a good share of that at zero cost.
Honest limitation. It is not a design platform and it is not a coupled building-systems simulator. No layout, no single-line diagram, no proposal. The interface expects an analyst, not a salesperson, and it will not carry your project through to a permit set.
Price. Free.
6. HOMER Pro: When the Real Question Is Architecture
Who it is for. Teams whose actual open question is hybrid or microgrid architecture. PV with batteries, generators, and sometimes other generation sources under a dispatch strategy.
What it does relative to Polysun. Both tools answer system-level questions rather than layout questions. HOMER Pro optimises the mix and the dispatch. Polysun couples electrical and thermal behaviour in a building. If your uncertainty is how much battery and how much generator, HOMER Pro is closer to your problem than any PV design tool. Our HOMER Pro review goes deeper, and the DC vs AC coupling note covers the storage decision that usually follows.
Honest limitation. It produces no layout, no drawings, and no customer proposal. It also carries a steep learning curve for occasional users.
Price. Quoted rather than publicly listed, so ask for a figure before you budget.
Comparison Table
| Tool | Best for | Price | Multi-energy capable | Drawings | Proposal |
|---|---|---|---|---|---|
| SurgePV | PV design, shading, drawings, proposal in one licence | $1,299 to $1,899 / user / yr | No | Yes, SLD and DWG | Yes, white-label |
| PV*SOL premium | PV plus storage and self-consumption with strong visuals | From about EUR 1,000 | Partial, storage focused | No | No |
| PVsyst | Lender and independent engineer yield review | ~$500 / user / yr | No | No | No |
| HelioScope | Fast C&I layout with module-level simulation | ~$1,188 / user / yr | No | No | No |
| SAM (NREL) | Free techno-economic and technology comparison | Free | Partial, multi-technology | No | No |
| HOMER Pro | Hybrid and microgrid architecture | Quoted | Partial, hybrid focused | No | No |
| Polysun | Sector-coupled PV, heat pump, thermal, storage | Licence by edition, quoted | Yes, the reference | No | No |
Read the multi-energy column carefully. Only Polysun holds a plain yes. The partial entries mean something narrower in each case, and none of them couples thermal and electrical behaviour dynamically.
Keep Polysun If You Actually Design Sector-Coupled Systems
This section is required honesty, so read it before you cancel anything.
If your firm genuinely specifies PV alongside heat pumps, solar thermal collectors and thermal storage, Polysun is the right tool and every alternative above is weaker for that job. None of the six replaces it. PV*SOL premium comes closest and still stops short of coupled thermal simulation. SurgePV does not attempt it at all.
The reason is structural. When a heat pump shares a building with an array, the load stops being a fixed profile. It responds to weather, to store temperature, and to control logic. Winter demand rises as PV output falls. Hot water draws cluster at hours the array produces nothing. Polysun simulates that as one system moving through time. Estimating it is not the same answer.
That capability is becoming more relevant as heating electrifies, not less. If it describes your work, buy Polysun and add a PV design platform beside it for the layout, the drawings and the proposal. The two do not overlap, so nothing is wasted.
How to Choose in One Pass
Answer one question first. Finish the sentence “my business is X” honestly.
If X is PV, buy the design platform as your daily tool and add a specialist seat only when a job truly needs it. If X is integrated energy systems, Polysun is the core and the design platform is the add-on that turns an accepted concept into something buildable and signable.
Then price the whole stack rather than the licence. A cheap simulator plus a proposal tool plus CAD seats often costs more than one platform that covers the set. Our solar design software pricing breakdown puts the category side by side.
If drawing throughput is the real bottleneck rather than software, our solar rooftop detailed engineering design bench produces the construction pack directly. See a sample design pack or talk to our team.
Conclusion
- Check which buyer you are before you shop. Most Polysun alternative searches come from PV teams who never needed a multi-energy simulator in the first place.
- For PV work, SurgePV is the strongest single answer. Browser-based 8,760-hour module-level design, single-line diagrams with DWG export, and a white-label proposal layer at $1,299 to $1,899 per user per year.
- For sector-coupled work, keep Polysun. Nothing on this list replaces dynamic simulation of PV with heat pumps, thermal storage and hot water, and pretending otherwise would cost you money.
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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 Polysun alternative for a PV installer? SurgePV, for the buyer whose daily work is roofs and paperwork. It runs 8,760-hour simulation with module-level shading, mismatch and string topology, produces single-line diagrams and DWG export from the same model, and includes a white-label proposal layer, at $1,299 to $1,899 per user per year.
Is there a free Polysun alternative? SAM from NREL is free and covers techno-economic modelling and technology comparison. It is not a design platform and not a coupled building-systems simulator, so it replaces the analysis half of Polysun’s job at best, never the drawings or the proposal.
Which tool is closest to Polysun? PV*SOL premium, for PV with storage and self-consumption modelling and strong customer-facing visuals. It starts from about EUR 1,000. It still does not couple heat pumps, solar thermal and thermal stores dynamically the way Polysun does.
Can any PV design platform replace Polysun’s multi-energy simulation? No. That is the plain answer. If your engineering question is how an array, a heat pump and a thermal store behave together across a year, keep Polysun. Anyone selling a PV layout tool as a substitute is overstating what it does.
How much does Polysun cost compared with the alternatives? Vela Solaris prices Polysun on a licence basis by edition and quotes rather than posts a figure, so ask for one. For reference on the rest of the field, PVsyst runs from about $500 per user per year, HelioScope about $1,188, SurgePV $1,299 to $1,899, Aurora $1,908 to $3,108, and PV*SOL premium from about EUR 1,000.
Should I run two tools instead of switching? Often yes. If a meaningful share of your work is multi-energy, Polysun settles the system concept and a design platform turns it into an array, a drawing set and a signed proposal. The tools do not overlap, so the second licence buys capability rather than duplication.
Related: the scope breakdown in our Polysun review, the European angle in PV*SOL alternatives, the cost comparison in solar design software pricing, hybrid modelling in the HOMER Pro review, and storage architecture in DC vs AC coupling.
