Most people searching for solar software in the USA are not shopping for one product. They are trying to work out what the whole stack is supposed to look like, which layers they actually need at their size, and which ones they are currently paying for twice. That is a different question from “which design tool is best”, and it deserves a different answer.
Direct answer. Solar software in the USA splits into six layers: design and simulation, sales and proposal, permitting and interconnection, monitoring, CRM and operations, and procurement. A residential installer under 200 systems a year typically needs three of them. Buying all six before you have the volume to feed them is the most common and most expensive mistake in this market.
TL;DR
- Six layers, not one product. Most installers overbuy the sales layer and underbuy the design layer.
- The US-specific layer is permitting and interconnection, because the AHJ and the utility are separate approvals with separate formats.
- Under roughly 200 systems a year, three layers is usually the right number.
- Overlap is where the money goes. Several platforms claim four layers and do one of them well.
- Total stack cost runs from about $2,000 to $25,000 per year per seat-heavy team, before headcount.
What “Solar Software” Actually Means in the USA
The phrase covers at least six distinct jobs, and vendors blur the boundaries deliberately because a platform that claims four layers can charge for four layers.
Design and simulation. Layout, string sizing, shading, and energy yield. This is the engineering layer and its output is a number somebody is financially responsible for.
Sales and proposal. Customer-facing documents, savings estimates, financing comparison, e-signature. Its output is a signed contract, not an engineering deliverable.
Permitting and interconnection. Plan sets for the AHJ, interconnection applications for the utility. This is the layer most specific to the United States and the one most commonly done manually.
Monitoring. Fleet-level production data after commissioning, usually from the inverter manufacturer’s portal, sometimes from an independent aggregator.
CRM and operations. Lead tracking, scheduling, crew dispatch, job costing. Frequently a general business tool rather than a solar-specific one.
Procurement. Equipment sourcing, pricing, and availability. Often a distributor portal rather than software you buy.
The reason this framing matters is that the buying decisions are independent. A company can run a best-in-class design tool alongside a general CRM and no proposal software at all, and be perfectly well configured. The vendors who sell suites have an interest in you not seeing it that way.
The US Solar Software Stack, Layer by Layer
| Layer | Representative tools | Who uses it daily | Typical cost per year |
|---|---|---|---|
| Design and simulation | PVsyst, HelioScope, SurgePV, Aurora | Designers, engineers | $500 to $3,100 per seat |
| Sales and proposal | Aurora, OpenSolar, Solo, SurgePV | Sales reps | $0 to $3,100 per seat |
| Permitting and interconnection | SolarAPP+ where adopted, GreenLancer, in-house CAD | Permit coordinators | Per-plan-set or per-seat |
| Monitoring | Enphase Enlighten, SolarEdge, Tigo, Also Energy | O&M team | Often bundled with hardware |
| CRM and operations | Salesforce, HubSpot, Sunbase, QuickEstimate | Everyone | $300 to $1,800 per seat |
| Procurement | Distributor portals | Purchasing | Usually free |
Two things in that table are worth pausing on.
First, the design and proposal columns share vendors. Aurora and SurgePV both appear twice because they genuinely span the boundary. That is legitimate, and it is also where double-paying starts: a company running Aurora for sales and PVsyst for engineering is paying twice for shading analysis and getting two different answers.
Second, monitoring is usually not a purchase. If you fit Enphase or SolarEdge, you get their portal. Independent monitoring becomes worth paying for at the point where you have a mixed-hardware fleet large enough that logging into four portals is a real operational cost, which for most installers is several hundred systems in.
The Layer That Is Specific to the United States
Permitting and interconnection is where US solar software diverges from every other market on this list.
The United States has no single approval route. The Authority Having Jurisdiction, typically a city or county building department, reviews the plan set against the National Electrical Code as adopted locally, and separately the utility reviews the interconnection application. These are different bodies, different formats, different timelines, and different rejection reasons. A design that satisfies one can be bounced by the other.
That creates a genuine software problem that does not exist in, say, the UK, where MCS certification and the DNO notification run through a much more standardised path. It also explains why plan-set production in the US is frequently outsourced rather than software-solved: the variation between roughly 20,000 AHJs is too high for a template to cover.
SolarAPP+, the automated permitting platform developed with NREL support, addresses part of this for jurisdictions that have adopted it. Adoption is real but partial, and a national installer still needs a manual path for most of its footprint.
The practical consequence is that “permitting software” in the US usually means either a CAD workflow with a strong template library, or a service that produces the plan set for you. Both are valid. Neither is a subscription that makes the problem disappear.
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What Stack You Need at Your Size
The right answer changes with volume, and the thresholds are more predictable than vendors suggest.
Under 50 systems a year. Two layers. A design tool and a spreadsheet. OpenSolar is free at the seat and covers design plus proposal adequately for residential work at this volume. A CRM is premature; you know all your customers by name.
50 to 200 systems a year. Three layers. Design, proposal, and a CRM. This is the point where leads start falling through cracks and the CRM stops being optional. It is also the point where the design tool and the proposal tool should probably still be the same product, because you do not yet have separate designers and sales reps.
200 to 1,000 systems a year. Four to five layers. Design and proposal now separate, because you have specialists doing each. Permitting becomes a defined function with either a dedicated coordinator or an outsourced partner. Monitoring becomes worth aggregating.
Above 1,000 systems a year. All six, plus integration between them. At this point the binding constraint is not which tools you have, it is whether data moves between them without being retyped. A company at this scale losing an hour per project to re-entry is losing thousands of hours a year.
The common failure is buying the 1,000-system stack at 80 systems. The tools are not wrong, they are early, and the subscription burn arrives before the volume that justifies it.
Pricing the Whole Stack
| Company stage | Layers | Realistic annual software spend |
|---|---|---|
| Under 50 systems | 2 | $0 to $2,000 |
| 50 to 200 systems | 3 | $2,000 to $8,000 |
| 200 to 1,000 systems | 5 | $10,000 to $40,000 |
| Above 1,000 systems | 6 plus integration | $40,000 upward |
These are software-only figures. They exclude the headcount to run the tools, which is almost always the larger number. A $3,100 Aurora seat is cheap next to the salary of the person using it, and that ratio is the reason “cheaper software” is rarely the real saving.
Per-platform detail sits in our solar design software pricing breakdown.
What Most US Installers Get Wrong
They buy the sales layer twice and the engineering layer not at all.
The pattern is consistent. A growing residential installer buys a proposal platform because sales asked for it, and that platform includes a shading and yield estimate. The estimate is good enough to sell with. Nobody buys a real simulation tool, because on paper they already have one. Then a project goes to a lender, or a customer disputes their production, and the company discovers that the number it has been quoting for two years came from a sales tool and does not survive scrutiny.
The fix is not expensive. PVsyst is roughly $500 a year, which is less than most proposal platforms cost per seat. The mistake is not budget, it is assuming the layers are interchangeable because one vendor sells both.
The second mistake is buying integration you do not need. Suite pricing is justified on the promise that the layers talk to each other. Below a few hundred projects a year, the volume of data actually moving between layers is small enough that a person retyping it is cheaper than the premium.
When Software Is Not the Answer
If plan sets are the bottleneck, more software rarely fixes it. The variation between AHJs means the constraint is usually engineering judgement and drafting capacity, not the tool.
Our solar permit design team produces AHJ-ready plan sets across US jurisdictions, with solar rooftop detailed engineering design for the full construction pack and STAAD Pro report calculations where structural sign-off is required. See the sample design pack or talk to our team.
Conclusion
- Map your stack by layer before buying anything. Most overspend is two products doing one job.
- Match layer count to volume. Three layers is right for most installers under 200 systems a year.
- Never let the sales tool be the engineering tool of record. They answer different questions to different standards.
In this country series: best solar design software in the USA, best solar proposal software in the USA, shading analysis software in the USA, Opensolar review. Tool deep dives: Pvsol review, Pvcase 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 solar software? An umbrella term for six distinct categories: design and simulation, sales and proposal, permitting and interconnection, monitoring, CRM and operations, and procurement. They are separate buying decisions, and most companies need three to five of them rather than all six.
What solar software do US installers actually use? Most commonly a design tool such as PVsyst, HelioScope, SurgePV, or Aurora, a proposal tool that is often the same product, a general CRM, and the inverter manufacturer’s monitoring portal. Permitting is frequently outsourced rather than licensed.
How much does a full solar software stack cost in the USA? Roughly $2,000 a year for a small residential installer running two or three layers, up to $40,000 or more for a company above 1,000 systems a year running all six with integration.
Do I need separate design and proposal software? Not until you have separate designers and sales reps, which is usually somewhere past 200 systems a year. Before that, one product spanning both is simpler and cheaper.
Is free solar software good enough? OpenSolar is genuinely usable for residential design and proposal at low volume, funded through transaction fees rather than seat licences. It is not a substitute for a simulation tool when a lender or a disputing customer is the audience.
What makes US solar software different from other markets? The permitting and interconnection layer. The AHJ and the utility are separate approvals with separate formats, and with roughly 20,000 jurisdictions the variation is too high for templates to fully solve.
Related: the design layer in depth is in best solar design software in the USA, the sales layer in best solar proposal software in the USA, and shading specifically in best solar shading analysis software in the USA.
