Best Polysun Alternatives 2026: Six Platforms Compared

If you are shopping for a Polysun alternative in 2026, the first thing to settle is not price. It is scope. Polysun, built by the Swiss company Vela Solaris, is not really a PV design tool that happens to do other things. It is a coupled energy system simulator that happens to include photovoltaics. That distinction decides whether any of the alternatives below can actually replace it for you, or whether you should stay put and buy a second tool for the PV work instead. This guide compares six realistic options, is honest about where each one falls short, and gives you a decision fork you can apply to your own project mix in about five minutes.

Short version. The best Polysun alternative depends entirely on whether you need coupled thermal and electrical simulation. If you do, PV*SOL premium is the closest partial match and no PV-only tool replaces Polysun. If you design photovoltaic systems and never touch a heat pump or hot water store, SurgePV, PVsyst, HelioScope, Aurora or OpenSolar will each be faster than Polysun for that narrower job.

Why Engineers Look for a Polysun Alternative

Polysun has a strong reputation in the German-speaking market and in academic work on combined systems. The people who go looking for something else usually have one of four complaints, and none of them are about simulation accuracy.

Pricing is quote-based

Vela Solaris lists its editions publicly but, at the time of writing, not their prices. The pricing page sets out Polysun Standard for standard projects and sales, Polysun Designer for professionals, Polysun SPT for installers and PV planners, plus Student, Educational and Enterprise or API tiers. It explains the licensing models clearly: a one-off purchase license for permanent usage rights with an annual service subscription for updates, or a lease license paid monthly with a 12 month minimum term. What it does not show is a number. For a two-person design office deciding between tools this week, a quote request is friction. We are not going to invent a figure here. Treat Polysun as quote-based and ask your distributor.

Complexity you may not use

Polysun’s component library covers solar thermal collectors, air-to-water, brine-to-water and water-to-water heat pumps, cooling units, conventional heating plant, short-term and seasonal thermal storage, ground-source loops, PVT collectors, PV modules, inverters, batteries and electrical load profiles. That breadth is the reason it exists. It is also why a user who only wants a rooftop string layout spends time navigating a hydraulic schematic editor. Software complexity is not free. It is paid in training days and in the hesitation of the junior engineer who has not touched the tool in three weeks.

It is an engineering tool, not a sales tool

Polysun produces technical reports and profitability calculations. It is not positioned to produce the branded, interactive, e-signable proposal that a residential or small commercial customer expects in 2026, so confirm current scope with the vendor. In practice most teams run Polysun plus a proposal tool, plus a CRM. That stack works, but it doubles the number of places a system size can be entered wrongly.

Desktop-first workflow

Polysun’s core product is a desktop application, with an API and cloud offering aimed at enterprise customers. Teams that have moved everything else to the browser tend to find a file-based workflow dated. Live shared editing of one project by two designers is not part of how the desktop product is sold as of writing, and a site visit means either a laptop or a rewrite when you get back. Confirm the current deployment options with Vela Solaris.

The Fork: Coupled Systems or PV-Only

This is the section that matters more than the comparison table.

If the answer is three or more, stay on Polysun. As of writing, none of the tools below is positioned as a dynamic thermal and electrical co-simulator. PVsyst is a PV yield simulator, HelioScope is an electrical layout and yield tool, and SurgePV, our own product, does not model heat pump coefficient of performance against ambient temperature. Confirm current scope with each vendor before you rely on that. Anyone who tells you a PV design platform replaces multi-energy simulation is selling you something. The honest advice for genuine multi-energy work is to keep Polysun and, if the sales side is your bottleneck, add a cheap proposal layer beside it rather than replacing the engine.

If the answer is zero or one, you are carrying weight for nothing. You are using Polysun because it is the tool your office bought, or because a professor taught it to you, or because it was already installed. A PV-focused platform will be faster at your actual work, because it makes different assumptions. It assumes there is one energy carrier, that the roof geometry is the hard part, and that the output has to persuade a customer as well as satisfy an engineer.

There is a middle case worth naming. Some teams do a handful of coupled projects a year and a great deal of PV. Running two tools is legitimate. One Polysun seat for the thermal jobs and PV-focused seats for everyone else is usually cheaper than putting the whole team on Designer licenses.

Six Polysun Alternatives Compared

1. SurgePV, the PV-Only Pick

Best for: Installers and EPCs whose Polysun usage is effectively PV-only, who want design, hourly simulation and customer-facing proposals in one browser-based license.

Pricing: $1,299 to $1,899 per user per year depending on team size, published on the SurgePV pricing page.

Strengths: AI 3D roof modelling from satellite imagery, 8,760-hour module-level shading analysis, hourly self-consumption and battery dispatch modelling against a real load profile, financial modelling with local tariffs, BOQ, single-line diagram, DXF and DWG export, and a white-label solar proposal with e-signature in the same project. Multi-country code and tariff libraries covering NEC, IEC, AS/NZS and IS.

Weaknesses: No thermal simulation. SurgePV is our own product and we are clear about its scope: no hydraulics, no thermal storage, no heat pump modelling. It is also newer than the incumbents, so the user community is smaller.

SurgePV vs Polysun: These are different products aimed at overlapping buyers. SurgePV wins decisively on speed to a sellable output and on the electrical self-consumption question. Polysun wins outright the moment heat enters the model.

2. PVSOL and PVSOL premium

Best for: Teams who want published pricing, a European code and tariff bias, and at least some thermal capability in the vendor family.

Pricing: PVSOL 2026 is EUR 585 for a one-year named user license and PVSOL premium 2026 is EUR 845, both plus VAT, according to the Valentin Software shop in 2026. Three-month licenses are also sold.

Strengths: Detailed 3D shading in premium, strong module and inverter databases, mature financial reporting, and a product family from Valentin Software that also covers solar thermal and heating design. Well established in Germany and across the EU.

Weaknesses: Desktop-first, named-user licensing, and in our view a UI that rewards familiarity more than it rewards discovery. Valentin’s thermal capability is real, but on hydraulics we would not treat it as a like-for-like substitute for Polysun Designer, and in the Valentin range that work often sits in separate products rather than a single coupled model. Confirm current scope with the vendor.

PV*SOL vs Polysun: The closest thing to a like-for-like move if you want to leave Vela Solaris but keep one foot in thermal. Read the deeper breakdown in our PV*SOL alternative comparison.

3. PVsyst

Best for: Bankable yield reports on larger PV assets where a lender or an independent engineer will read the output.

Pricing: PVsyst publishes per-seat licence pricing, with the Standard tier commonly reported around EUR 500 per user per year at the time of writing and a Premium tier priced on request. Confirm current bands with PVsyst before committing.

Strengths: The reference standard for PV energy yield. Loss diagrams that technical reviewers recognise immediately. Deep near and far shading, detailed P50 and P90 statistics, and thorough component parameter control.

Weaknesses: Steep learning curve and a desktop workflow. It is not positioned as a proposal tool or as a thermal co-simulator, so most teams pair it with separate quoting; confirm current scope with the vendor. In our experience it is slow for the volume residential work Polysun SPT users often do.

PVsyst vs Polysun: A trade of breadth for PV depth. You lose every thermal capability and gain the report format lenders expect. See our PVsyst alternative guide for the wider field.

4. HelioScope

Best for: Commercial and industrial electrical design, string layout and inter-row shading on large flat roofs and ground mounts.

Pricing: Published per-user subscription tiers that vary by feature set. Check current figures with Aurora Solar, which owns HelioScope.

Strengths: Fast layout for big arrays, excellent single-line and wiring output, hourly simulation that engineering teams trust, and a workflow built around iteration rather than one-shot modelling.

Weaknesses: Not positioned as a proposal tool or a thermal simulator, and in our view residential detail work is not where it shines. Per-seat pricing means cost scales with team size, so price it against your headcount.

HelioScope vs Polysun: If your Polysun projects are C&I rooftops with no heat component, this is a straightforward productivity gain. Our HelioScope alternative page covers the trade-offs.

5. Aurora Solar

Best for: United States residential sales and design teams.

Pricing: Published bands sit around $159 to $259 per user per month on third-party trackers, which is roughly $1,908 to $3,108 per user per year.

Strengths: Excellent residential 3D modelling, strong NEC alignment, a polished sales-facing experience, and a large trained user base in the US market.

Weaknesses: US-focused code and tariff coverage, features distributed across tiers, and it is not positioned as a multi-energy simulator. A European Polysun user is likely to find the code libraries a poor match for local practice.

Aurora vs Polysun: Only sensible if you are in the US and your work is residential PV. Our Aurora Solar alternative comparison has the detail.

6. OpenSolar

Best for: Very price-sensitive small residential installers.

Pricing: Free core platform, monetised through hardware and finance partner integrations plus paid add-ons.

Strengths: Zero fixed license cost, decent residential design experience, and a working proposal flow out of the box.

Weaknesses: In our view the simulation is aimed at fast residential quoting rather than at the depth PVsyst or Polysun target. C&I capability is not its focus, the paid add-ons need pricing individually, and it is not positioned as a thermal simulator.

OpenSolar vs Polysun: In our view a step down in engineering depth and a step up in speed for simple roofs. Reasonable if your Polysun licence is genuinely idle most months. See the OpenSolar alternative breakdown.

Comparison Table

Capability and price entries reflect publicly available vendor information at the time of writing. All three of Vela Solaris, Valentin Software and PVsyst ship frequent releases, so confirm current scope and pricing with each vendor.

Read the “couples PV with thermal and heat pumps” column first. It is the only column where Polysun is unmatched, and it is the column that decides whether the rest of the table is relevant to you.

Who Should Choose What

• Stay on Polysun if three or more of your last 20 projects needed heat and electricity solved together, or if you work on PVT collectors, solar cooling, seasonal storage or district-scale heat concepts. Nothing here replaces that.
• Choose SurgePV if your Polysun usage has quietly become PV-only, you want one license covering layout, hourly yield, self-consumption and a branded proposal, and you want your team working in a browser rather than passing files around.
• Choose PV*SOL if you want published European pricing, a familiar desktop workflow, and the option to keep some thermal work inside the same vendor family.
• Choose PVsyst if your output is read by lenders and independent engineers, and someone else handles the customer conversation.
• Choose HelioScope if you are a C&I electrical design team and proposals are not your job.
• Choose Aurora Solar if you sell residential PV in the United States and NEC depth matters more than international coverage.
• Choose OpenSolar if fixed software cost has to be near zero and your roofs are simple.

The Bottom Line

Polysun is a specialist tool doing a specialist job well, and the market for genuine multi-energy simulation is small enough that its competitors are academic packages rather than commercial PV platforms. The mistake is not choosing Polysun. The mistake is keeping it as a default long after your project mix stopped needing it. Our companion Polysun review goes deeper on the product itself if you want the fuller picture before deciding.

Three things to do this week:

• Audit your last 20 projects and count how many genuinely needed coupled thermal and electrical modelling. That number, not a feature list, is your answer.
• If the count is low, trial one PV-focused platform on a real project rather than a demo file, and time the run from address to signed-ready proposal.
• If the count is high, keep Polysun and fix the sales-side gap separately with a proposal layer, which is far cheaper than a wrong migration.

About This Comparison

Pricing, features and product positioning described here were checked in August 2026 using publicly available vendor information. Vendors change pricing, packaging and capabilities without notice, and several do not publish prices at all. Treat every figure as a starting point for your own enquiry rather than a quotation, and confirm current terms directly with each vendor before making a purchasing decision.

All product names, logos and trademarks are the property of their respective owners. Reference to them here is for identification and comparison only and does not imply any affiliation with, sponsorship by, or endorsement from those companies. SurgePV is a Qbits Energy product, so treat this as a vendor comparison written by an interested party and weigh it alongside independent sources and your own trial of the tools.

Where we could not verify a claim from a primary source we have said so in the text rather than repeating it. If you believe anything here is inaccurate or out of date, contact us and we will review and correct it.