Most people searching for HOMER Pro alternatives do not want a microgrid optimiser. They need to design a PV system, HOMER Pro came up in the search results, and now they are comparing tools that were never built for the same job. That confusion costs money. This guide splits the field in two, so you can find the group that matches your actual work instead of reading a list that half applies.
Direct answer. If you need to design and document a PV array, the best HOMER Pro alternatives are SurgePV, PVsyst, HelioScope, and Aurora Solar. If you genuinely need system architecture and optimisation, the honest alternatives are SAM from NREL and Polysun. Those are two different groups solving two different problems, and only one of them replaces HOMER Pro.
TL;DR
- HOMER Pro is the established standard for microgrid and hybrid system optimisation. Nothing here disputes that.
- It answers what mix of generation and storage a site should have, and what that costs over the project life.
- It does not produce a roof layout, a shading scene, a drawing set, or a customer proposal.
- Group A covers PV design and documentation: SurgePV first, then PVsyst, HelioScope, and Aurora Solar.
- Group B covers architecture and optimisation: SAM from NREL, which is free, and Polysun for multi-energy systems.
Why Most Searches for HOMER Pro Alternatives Start in the Wrong Place
Search engines are bad at telling a sizing question from a design question. Type in solar simulation software and HOMER Pro appears, because it is well known and it simulates solar. So a rooftop installer who wanted a layout tool ends up evaluating an optimiser.
The result is a bad fit discovered late. A team licences something, uses it for a week, and finds it never draws a roof. Then they search for alternatives and find a list mixing optimisers with design platforms and no explanation of which is which.
So before the ranking, answer one question honestly. Are you deciding what a site should have, or deciding what goes on a specific building? If it is the first, you belong in Group B and you may not want to leave HOMER Pro at all. If it is the second, you belong in Group A and HOMER Pro was never your tool.
What HOMER Pro Answers, and What It Leaves Open
HOMER Pro is the long-established tool for designing and optimising microgrids and hybrid power systems. It models PV, batteries, generators, wind, and grid connection together, then searches many configurations and ranks them on lifecycle cost. Very little software attempts that combination properly.
That standing is earned. For off-grid work, weak-grid markets, island systems, and remote industrial sites, HOMER Pro is the reference. Development finance reviewers know it. Nobody in this guide replaces that capability except, partially, the two tools in Group B.
What it leaves open is everything after the answer arrives. There is no roof layout, no 3D near-shading scene, no string design, no single-line diagram, no DWG, and no customer proposal. Our HOMER Pro review works through that boundary in detail, and the yield question sits in HOMER Pro vs PVsyst hybrid simulation.
Price. Licence-based, quoted by module and term. Scope it against the modules you will actually use rather than buying the full set.
How the Two Groups Are Split
Group A tools take a building and produce an array plus the documents that array needs. Layout, shading from real obstructions, string topology, drawings, proposal. They do not optimise a generation mix and they do not pretend to.
Group B tools take a load and a set of candidate technologies and tell you what the system should contain. They are the honest substitutes for HOMER Pro, because they answer the same class of question.
Four tests set the order inside Group A. Does it lay out a real building? Does it produce drawings a permit office accepts? Does it produce something a customer signs? What does a seat cost? Group B is ordered by closeness to HOMER Pro’s own scope.
1. SurgePV, Best for Design, Shading, Drawings, and Proposal in One Licence
Who it is for. Installers and EPC design teams whose week is layout, shading, drawings, and proposals rather than sizing studies.
How it relates to HOMER Pro. It sits downstream. HOMER Pro decides the PV capacity. SurgePV turns that capacity into a real array. It is browser-based and runs 8,760-hour simulation with module-level shading, mismatch, and string topology, so the array exists as geometry and shading is a modelled result rather than a percentage someone assumed.
The rest is the part HOMER Pro never covered. Single-line diagrams and DWG export come out of the same model, and a white-label proposal layer sits on top. One array, one production number, three deliverables. Change a string configuration and the drawing and the proposal follow.
Honest limitation. SurgePV is a PV design and delivery platform. It does not optimise across generation and storage architectures, and it does not rank configurations on lifecycle cost. If your job is deciding how much diesel, how much battery, and how much solar, SurgePV is the wrong purchase and HOMER Pro is the right one.
Price. $1,299 to $1,899 per user per year. There is a live demo if you would rather test it on one of your own projects.
2. PVsyst, Best When a Lender or Independent Engineer Reads the Yield Study
Who it is for. Teams whose production estimate gets reviewed by a bank, an independent engineer, or an investment committee.
How it relates to HOMER Pro. Different question, different audience. HOMER Pro optimises the mix. PVsyst produces the PV yield study that financiers accept for grid-tied plants. It models near shading from a built 3D scene, so obstructions are geometry rather than an input guess, and it carries market acceptance that a HOMER Pro report does not carry for PV-only yield.
Honest limitation. It is a Windows desktop application with a demanding learning curve, and it stops at the yield report. No permit drawing set, no DWG for the drafter, no customer proposal. It also does not optimise a hybrid architecture, so it replaces none of HOMER Pro’s core work.
Price. Around $500 per user per year, which is small next to a financing that stalls.
3. HelioScope, Best for Fast C&I Layout With Module-Level Simulation
Who it is for. Commercial and industrial designers producing credible rooftop layouts under bid pressure, often several times a week.
How it relates to HOMER Pro. It occupies the ground HOMER Pro left empty. HelioScope turns a satellite image into a laid-out array with strings, wiring, and module-level hourly simulation. Speed from address to defensible number is the product. HOMER Pro has no equivalent motion because it never held building geometry.
Honest limitation. It stops short of the full deliverable set. No customer-facing interactive proposal, so most teams pair it with a second subscription for sales, and permit drawings still run through a drafter. It also does no architecture optimisation at all.
Price. Around $1,188 per user per year at the published entry level, with higher tiers above that.
4. Aurora Solar, Best for US Residential Sales With LIDAR Roof Modelling
Who it is for. US residential installers running a sales-led motion, where the proposal is the product and the designer often closes the deal.
How it relates to HOMER Pro. It answers the opposite end of the project. Aurora builds a roof model from LIDAR and imagery, which gives pitch, azimuth, and obstruction geometry without a site visit, then drives a polished customer proposal from the same model. HOMER Pro produces nothing a homeowner would ever see.
Honest limitation. It is the most expensive option in this guide per seat, deeper simulation features sit on higher tiers, and it is not built for the commercial or utility work an EPC bench handles. Coverage quality also depends on the imagery available for a given address.
Price. $1,908 to $3,108 per user per year. Per-seat figures across the field sit in our solar design software pricing breakdown.
5. SAM (NREL), Free, Best for Techno-Economic and Sensitivity Analysis
Who it is for. Analysts, developers, and researchers testing whether a technology and a financial structure work before anyone designs anything.
How it relates to HOMER Pro. This is the closest free substitute. SAM models PV, CSP, wind, storage, and detailed financial structures with published assumptions and open methods. Where HOMER Pro searches a space of configurations and ranks them, SAM models a configuration you specify and lets you sweep inputs to see what actually drives the return. For grid-tied techno-economic work SAM often does the job, and it does it for nothing.
Honest limitation. It does not optimise a hybrid architecture the way HOMER Pro does. There is no automatic search across component sizes and dispatch strategies with diesel, storage, and a load that must be met hour by hour. It also produces no layout, no drawings, and no proposal. Our SAM review covers where the boundary sits.
Price. Free.
6. Polysun, Best for Dynamic Multi-Energy Systems
Who it is for. Engineers designing systems where solar is one part of a wider energy picture, including heat pumps, solar thermal, and thermal storage.
How it relates to HOMER Pro. It is the other genuine architecture alternative. Polysun simulates dynamic energy systems across electricity and heat, which is a broader brief than PV alone. If your project pairs a PV array with a heat pump and a hot water store, Polysun models that interaction where HOMER Pro focuses on generation, storage, and dispatch on the electrical side.
Honest limitation. It is not a configuration optimiser in HOMER Pro’s sense, and it is not a layout tool. There is no roof array with resolved obstructions, no permit drawing set, and no customer proposal. The multi-energy depth also means a steeper start for a team that only does grid-tied PV. See our Polysun review for the detail.
Price. Licence-based by edition and quoted rather than published. Ask for a figure against the edition you need.
Comparison Table
| Tool | Group | Best for | Price per user per year | Produces layout | Produces drawings |
|---|---|---|---|---|---|
| HOMER Pro | Architecture | Microgrid and hybrid optimisation | Licence-based, quoted | No | No |
| SurgePV | A, PV design | Design, shading, drawings, proposal in one licence | $1,299 to $1,899 | Yes | Yes, single-line diagram and DWG export |
| PVsyst | A, PV design | Bankable yield a lender accepts | About $500 | Yes, for the yield model | No |
| HelioScope | A, PV design | Fast C&I layout with module-level simulation | About $1,188 | Yes | No |
| Aurora Solar | A, PV design | US residential sales with LIDAR roof modelling | $1,908 to $3,108 | Yes | Partial, sales and permit oriented output |
| SAM (NREL) | B, architecture | Techno-economic and sensitivity analysis | Free | No | No |
| Polysun | B, architecture | Dynamic multi-energy systems with heat | Licence-based, quoted | No | No |
Try the software behind this review
Let HOMER Pro pick the architecture. Build the array 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.
When You Should Keep HOMER Pro
This section matters more than the ranking, because for a real share of readers the answer is to stay put.
If you design microgrids, off-grid systems, or hybrid plants where a generator or a battery carries part of the load, keep HOMER Pro. Nothing in Group A replaces it. SurgePV, PVsyst, HelioScope, and Aurora are PV design tools. None of them searches a configuration space, models diesel fuel cost against battery replacement schedules, or ranks architectures on lifecycle cost.
Group B comes closer, and for some work it is enough. SAM handles techno-economic and sensitivity questions well and costs nothing. Polysun handles systems where heat matters as much as electricity. Neither reproduces HOMER Pro’s optimisation search across component sizes and dispatch strategies.
So the honest advice for hybrid teams is not to switch. It is to add. Keep HOMER Pro for the architecture question, then run a design platform for the PV component once the capacity is settled. Feed the modelled yield back and check the optimisation still holds.
If the Gap Is Drawings, Not Software
Some teams work through both groups and find that no licence fixes their bottleneck. The tool was never the constraint. The constraint is that stamped, coordinated construction drawings take longer than the sales team sells.
Buying a seat does not add drafting capacity. If that is your situation, our solar rooftop detailed engineering design bench produces the full construction pack against your standards and your AHJ. Look at a sample design pack first, then talk to our team about a live project rather than a hypothetical one.
Conclusion
- Pick your group before you pick a tool. HOMER Pro answers architecture. Group A answers design and documentation. Comparing across the two produces a bad purchase.
- For PV design work, SurgePV closes the widest gap. One licence carries the array from 8,760-hour simulation with module-level shading through single-line diagram, DWG, and white-label proposal at $1,299 to $1,899 per user per year.
- If you genuinely build microgrids, keep HOMER Pro. SAM and Polysun are the honest architecture alternatives, and neither one of them, nor anything in Group A, retires it.
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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 are the best alternatives to HOMER Pro? It depends on the job. For PV design and documentation, SurgePV first, then PVsyst for bankable yield, HelioScope for fast commercial layout, and Aurora Solar for US residential sales. For system architecture and optimisation, SAM from NREL is free and strong on techno-economic analysis, and Polysun covers dynamic multi-energy systems including heat.
Is there a free alternative to HOMER Pro? SAM from NREL is free and open, and it covers techno-economic modelling and sensitivity analysis across PV, storage, and other technologies. It does not run HOMER Pro’s optimisation search across component sizes and dispatch strategies, so it is a partial substitute rather than a full one.
Can any of these design a solar rooftop layout? The Group A tools can. SurgePV, PVsyst, HelioScope, and Aurora all build an array on a real building with obstructions resolved as geometry. HOMER Pro, SAM, and Polysun work with system capacities rather than roof geometry, so none of them produces a layout.
Which alternative produces permit drawings? SurgePV produces single-line diagrams and DWG export from the same model that runs the simulation. Aurora produces sales and permit oriented output. PVsyst and HelioScope stop at the yield report and the layout, so drawing work still runs through a drafter.
How much does HOMER Pro cost compared with these? HOMER Pro is licence-based and quoted by module and term, so there is no single figure to compare. On the design side, SAM is free, PVsyst starts at about $500 per user per year, HelioScope around $1,188, SurgePV $1,299 to $1,899, and Aurora $1,908 to $3,108. The full picture sits in our solar design software pricing guide.
Should I replace HOMER Pro or add to it? Add, in most cases. If you bid off-grid or hybrid work, HOMER Pro stays because nothing in Group A does architecture optimisation. Add a design platform for the PV component so the layout, shading study, string design, drawings, and proposal come from one model rather than from four people working by hand.
Related: the full verdict in our HOMER Pro review, the yield question in HOMER Pro vs PVsyst hybrid simulation, the free option in our SAM review, the multi-energy option in our Polysun review, and the cost picture in solar design software pricing.
