Choosing The Best Solar Design & Proposal Software in 2026

Table of Contents

-- Types of Solar Design Software

-- Choosing Solar Design Software

-- Permit & Engineering Workflow Compatibility

-- Why Accurate Design Data Matters

-- Best Solar Design Software

-- Pros and Cons of PV Design Software

-- Common Issues With Solar Software

Solar design software has become the backbone of a modern installation business. The right platform combines layout modeling, production estimates, and solar proposal software into one workflow. Installers use it to move from a rooftop photo to a signed contract in days, sometimes hours.

Finding the best solar design software for your team depends on the type of work you do. A residential crew needs fast roof modeling and financing tools built in. A team running commercial solar design software for carports or larger rooflines needs multi-meter interval data and more complex electrical layouts than a single-family home requires.

The best solar design software depends on your project mix. Aurora Solar and Solargraf by Enphase are strong choices for residential sales and design. OpenSolar is a capable free platform for smaller teams. HelioScope handles carports and larger commercial rooflines well, and PVCAD by Enact Solar supports AutoCAD-based engineering for more complex layouts.

Types of Solar Design and Proposal Software

Not every platform on the market solves the same problem. Some tools focus on speed and closing rate for residential sales teams. Others are built for engineers running more complex commercial layouts. Picking the right category first will save you from paying for features you will never use.

Residential Solar Design and Proposal Software

Residential solar proposal software prioritizes speed. A sales rep needs to model a roof, estimate production, and generate a branded proposal while still standing in the customer's living room. Shading analysis, utility rate comparisons, and financing options like loans, leases, or TPO agreements can be configured within the platform or pulled through supported financing integrations. Most platforms in this category also include a built-in CRM, so leads never get lost between the sales and design steps.

Commercial Solar Design Software

Commercial solar design software has to handle larger, more complicated buildings. Carports, multiple rooflines, and several electrical meters are common on a single project. These platforms model interval data pulled from actual utility bills rather than a flat average, since commercial rate structures vary by time of use and demand charges. Production modeling also has to account for partial shading across a much larger array.

Residential vs. Light Commercial: What Each Side Needs

The feature list that matters most depends heavily on which type of project fills most of your pipeline.

Residential installers usually need:

• Fast roof modeling

• Shading analysis

• Utility bill savings comparisons

• Financing integrations

• Battery proposals

• CRM and e-signature tools

• Mobile-friendly sales tools

Light commercial installers usually need:

• Multiple roof sections

• Carport layouts

• Multi-meter and interval load data

• Demand charge modeling

• More flexible equipment layouts

• CAD exports

• Stronger engineering handoff and revision control

Solar CAD and Engineering Software

Solar CAD software sits one step past the sales-oriented tools above. It may export to AutoCAD so designers and engineers can refine construction documents, complete calculations, and prepare drawings for professional review when required. Installers handling more complex commercial layouts or running their own solar engineering software workflows typically need this level of unlocked customization rather than a template-based design tool.

Looking for utility-scale solar design software?

Large ground-mount and tracker projects usually need specialized terrain, civil, yield, and plant-optimization tools such as PVcase, RatedPower, or PVsyst. This article focuses on residential and light commercial workflows, where proposal speed, roof modeling, CRM integration, and permit handoff matter most.

How to Choose Solar Design Software

Once you know which category fits your business, the next step is comparing platforms feature by feature. The considerations below cover the areas that tend to separate a strong platform from one that frustrates your team within a few months.

Project Creation, Remote Surveys, and AI Layout Tools

Modern project creation starts well before a truck rolls to the site. An ai solar design tool combines satellite imagery with LiDAR data to build a digital model of the roof or property. Automatic keep-out detection flags vents, chimneys, and tree shading without a designer tracing every obstruction by hand, though it can occasionally misread an HVAC unit or a smaller vent, so a quick human check still helps.

Some platforms let a rep send a virtual survey link so homeowners can photograph their own electrical panel and attic, and drone-based site surveys, offered by tools like Scanifly, can add detailed roof measurements and imagery for post-sale design verification. Many platforms also offer auto-stringing tools that propose module and inverter configurations based on equipment limits and design rules, though a qualified designer still needs to verify voltage, current, and adopted-code requirements before the design goes to permitting.

Shading and Production Modeling

Accurate shading analysis is one of the biggest differentiators between platforms. Look for twelve month irradiance modeling rather than a single snapshot estimate, since shading patterns shift with the seasons. Bifacial gain, row-to-row shading, and tree growth projections all affect whether a production estimate holds up once the system is installed.

Proposal, Quoting, and Financial Modeling

Solar quoting software and solar estimating software should generate a branded, customer-ready proposal in minutes, not hours. Financial modeling needs to cover leases, loans, PPAs, and the increasingly common TPO structure side by side. Look for financial modeling that supports cash flow, payback period, financing costs, and applicable incentives, not just a simplified payback estimate.

CRM, Financing, and Workflow Integrations

A solar CRM with integrated design eliminates the double data entry that slows down teams using separate sales and engineering tools. Check whether the platform supports API connections to your financing and procurement partners. The best solar CRM options double as solar sales software, syncing lead status, design revisions, and proposal versions automatically so nothing falls through the cracks.

CAD Exports and Engineering Capabilities

If your team or a partner engineer needs to modify a design after the sale, file export options matter. DXF and AutoCAD exports let a licensed engineer adjust stringing or structural details without redrawing the whole layout. This matters most on commercial projects, where a sales-ready design and a construction-ready one are rarely identical.

Pricing, Credits, and User Limits

Solar software pricing has shifted from flat subscriptions toward usage-based credit systems over the past few years. Subscription plans still work well for high-volume installers with predictable monthly project counts. Credit-based pricing tends to suit growing teams better, since you only pay for the projects you actually run.

Solar Software Evaluation Checklist

• Primary project type: residential or light commercial

• Layout and shading accuracy

• Production-modeling methodology

• Battery and utility-rate modeling

• Proposal and financing integrations

• CRM and API integrations

• CAD, DXF, or other export capabilities

• Permit drawing or plan-set capabilities

• Pricing per user, design, project, or credit

• Data portability and contract terms

• Training and customer support

• Trial or pilot-project availability

Questions to Ask During a Trial

• Model one simple roof and one difficult project

• Compare the software's shading estimate against a known production model

• Export equipment and electrical data into an actual permit workflow

• Test a design revision after the proposal has already been signed

• Confirm who owns and can export the project data

• Calculate total annual cost at your expected project volume

• Ask whether unused credits expire

• Verify which integrations require a higher plan or a separate fee

Permit and Engineering Workflow Compatibility

Design software can speed up the sales process, but it does not replace the permitting and engineering review your local jurisdiction requires. Some jurisdictions now use automated permitting systems such as SolarAPP+ to issue same-day approvals for standardized residential systems. That automation depends on the jurisdiction adopting the platform, not on the design software used to create the layout.

Before committing to a platform, confirm it can export clean equipment lists and electrical data your permit designer or engineer can use. It should also generate plan-set inputs without a full redraw, keep a revision history between sales and engineering, and produce jurisdiction-specific documentation. Software that flags an obvious code conflict is helpful, but it is still not a substitute for a licensed reviewer confirming compliance with your local adopted code.

The NABCEP PV Design Specialist credential is one credential installers can look for when evaluating a designer’s training, experience, and demonstrated PV design knowledge.

Design Stages: What Each One Actually Covers

Design Stage	Primary Purpose	Typical Output
Sales design	Estimate system size, production, and economics	Preliminary layout and proposal
Permit design	Document a code-compliant installation for review	Site plan, electrical drawings, labels, equipment details
Engineering design	Verify structural or electrical requirements	Calculations, details, and professional engineering review
Construction/as-built design	Guide field installation and record installed conditions	Final drawings, revisions, string maps, equipment records

If your software-generated design needs a licensed stamp before it reaches the permitting office, GreenLancer's permit design and PV interconnection teams handle that step for installers across the country. Reach out through our contact form to get a quote.

Why Accurate Design Data Matters After Installation

A design file does not stop mattering once a system is installed. Accurate as-built layouts, equipment serial numbers, and stringing maps make future service work faster and cheaper. When a customer adds a battery or additional panels later, GreenLancer's solar system upgrades team relies on that original design data to scope the project correctly, without re-surveying the entire roof from scratch.

The same records support warranty claims and long-term monitoring handoffs, whether that is your own service team or a third-party asset manager. Keeping design revisions organized inside your software from day one saves real time down the road.

Best Solar Design and Proposal Software for Installers in 2026

The platforms below are evaluated specifically for residential and light commercial installers, not utility-scale developers. We compared them on supported project types, layout and shading accuracy, production modeling, proposal tools, integrations, engineering exports, and pricing transparency. GreenLancer does not receive compensation for the rankings in this article.

Pricing and features change often in this market. The figures below were checked in July 2026, and vendors may adjust plans, project allowances, or integrations without notice. The table gives you a quick overview, and the sections below go deeper on where each platform actually excels.

Platform	Best For	Residential Design	Light Commercial	Proposals	CRM	CAD Export	Pricing Model
Arka 360	Design and CRM in one platform	Strong	Moderate	Strong	Add-on, varies by plan	Yes	~$159 to $199/mo, verify current plan
Aurora Solar	Established residential sales teams	Strong	Moderate	Strong	Integrations	Limited	$159/user/mo; credit options separate
OpenSolar	Free full-stack for small residential teams	Strong	Limited	Strong	Built in	Limited	Free core; API/connectors extra
HelioScope	Light commercial and carport modeling	Limited	Strong	Limited	Limited	Yes	Subscription, $159/mo+
Solargraf by Enphase	Enphase-focused residential contractors	Strong	Limited	Strong	Ecosystem	Limited	Annual, $2,799/yr+
PVCAD by Enact Solar	AutoCAD-based design and permit drawings	Moderate	Strong	Limited	Limited	Yes	Subscription, ~$199/mo
Pylon	Pay-as-you-go design and proposals	Strong	Moderate	Strong	Built in	Limited	No monthly fee; roughly $4 to $10 per project

Arka 360

Arka 360 has grown into one of the more established Aurora Solar alternatives for installers who want design and CRM in one platform. Its virtual survey feature lets homeowners upload their own site photos, cutting down on truck rolls before a sale closes. Published pricing is inconsistent across sources at the time of writing, generally in the $159 to $199 per month range, and CRM access depends on which plan you choose, so confirm current plan details directly with Arka 360.

Aurora Solar

Aurora Solar is one of the most established residential design and sales platforms, and Aurora AI automates much of the 3D modeling and shading analysis. Aurora offers per-user subscription plans and separate credit-based purchasing options. Its Basic plan starts at $159 per user per month, and also offers credit-based purchasing for certain project services, with credit requirements varying by service. It is a strong fit for teams that want deep design accuracy alongside built-in proposal and sales tools.

PVCAD by Enact Solar

Enact Solar acquired PVComplete in 2026, and PVCAD is the AutoCAD-based engineering product within Enact's broader platform, which also covers proposal creation, workflow, and asset management. PVCAD is a strong option for residential and light commercial teams that need AutoCAD-based layouts, electrical drawings, and more control than a template-driven proposal platform provides. Entry pricing starts around $199 per month, with a plug-in bundle available for teams that need full AutoCAD access.

HelioScope

HelioScope, now owned by Aurora Solar, is positioned around commercial and industrial design rather than utility-scale work. It handles carports, multi-array sites, and preliminary ground mounts on standard plans, with AI-assisted obstruction detection available on the Pro tier.

Basic plans start around $159 per month for up to ten projects, and Enterprise pricing scales for designs up to 30 megawatts. Its proposal and financial tools exist mainly to support technical sales on commercial projects, so teams that need a full residential proposal workflow usually pair it with another platform.

OpenSolar

OpenSolar is a full solar CRM with integrated design that costs nothing to use for the core platform, since the company generates revenue through hardware and financing partnerships instead of subscription fees. As of April 2026, API access and some third-party connectors carry separate charges, so confirm current terms if your workflow depends on outside integrations.

The 3.0 version added an AI assistant for auto-design along with a lifestyle-focused proposal tool covering EVs and heat pumps. It is a solid starting point for small residential installers who want professional output without a monthly bill.

Pylon

Pylon is a design, proposal, and CRM platform on a pay-as-you-go model instead of a monthly subscription, generally landing around $4 to $10 per project depending on tier. It uses a 2D layout tool rather than a rotating 3D model, which some installers find faster on a tablet in the field. The platform was originally built in Australia and serves installers in both Australia and the United States, so confirm equipment library coverage and integrations for your specific market before switching.

Solargraf by Enphase

Solargraf, owned by Enphase, is built for residential installers who sell Enphase batteries and microinverters as their primary equipment line. Direct integration with Enphase's commissioning tools lets a design push straight to the field app. Pricing runs on an annual model, starting around $2,799 per year for two users and 240 projects.

Best Solar Design Software by Need

Need	Strong Option	Why
Small residential installers	OpenSolar	Free core design, CRM, and proposals
Established residential sales teams	Aurora Solar	Deep design accuracy plus proposal and financing tools
Enphase-focused residential contractors	Solargraf by Enphase	Direct integration with Enphase equipment and commissioning
Integrated design and CRM	Arka 360	Single platform for design, proposals, and lead tracking
Light commercial modeling	HelioScope	Carports, multiple rooflines, and detailed production modeling
AutoCAD-based design and permit drawings	PVCAD by Enact Solar	Detailed drafting and engineering handoff
Project lifecycle and asset management	Enact Solar	Broader platform covering design, proposals, and ongoing asset tracking
Avoiding a monthly subscription	Pylon	Pay-as-you-go pricing per project instead of a flat monthly fee
Drone-based measurement and verification	Scanifly	Purpose-built drone survey and 3D modeling for post-sale accuracy
Best free solar design software	OpenSolar	One of the most capable free platforms for solar design, CRM, and proposals.

Best Solar Proposal Software for Residential and Commercial Installers

Design accuracy only gets you halfway to a signed contract. The platforms above vary quite a bit in how they handle the proposal and financing side of the sale, which matters just as much for close rate.

Aurora Solar and Solargraf by Enphase both generate polished, branded proposals with built-in financing comparisons across cash, loan, lease, and PPA options. Arka 360 covers a similar range, including RESCO and CAPEX structures, and OpenSolar's Sales Machine proposal tool covers cash, loan, and lease scenarios at no cost. HelioScope is the outlier here, since its proposal and financial tools exist mainly to support technical sales on commercial projects rather than replace a dedicated residential proposal workflow.

For light commercial work, look specifically for support of multiple meters, time-of-use and demand charge modeling, and TPO structures alongside the standard residential financing options. Not every platform above handles commercial rate structures with the same depth, so confirm this directly with a sample project before committing.

Whatever platform generates the proposal, check for e-signature support, adders and margin controls, and a financing partner list that matches who you actually work with. A proposal tool that cannot route to your preferred lender just adds an extra manual step to every deal.

Pros and Cons of Solar Design Software

Pros	Cons
✅ Streamlines the design process, with some platforms enabling five minute sales proposals	❌ Steep learning curve on professional engineering suites like PVCAD
✅ LiDAR and AI-assisted modeling can improve roof geometry and shading estimates when high-quality source data is available	❌ High subscription and credit costs for low-volume installers
✅ Integrated CRM that syncs lead data with designs and eliminates double entry	❌ Limited transparency in some automated shading models
✅ Professional branded proposals that build homeowner trust	❌ Design accuracy depends on the quality of satellite and LiDAR data available
✅ Advanced storage modeling for battery ROI under current utility rate structures	❌ Cloud dependence can slow down field surveys in areas with weak signal

Common Problems With Solar Software

Most complaints about solar software fall into a handful of recurring categories. Platform fragmentation is the most common one, where a team still runs separate tools for CRM, design, and financing and ends up with data silos between the sales pitch and the engineering review.

Storage simulation is a growing pain point too. Battery state-of-charge and peak shaving modeling need to be accurate, or installers risk over-promising savings to customers on complex utility rate plans. Integration friction between a design platform and a specific financier's portal can also require manual overrides, especially when shading or production numbers do not match the financier's own model.

Red Flags When Evaluating a Solar Software Vendor

• Opaque AI shading claims with no methodology explanation

• No data export options if you switch platforms later

• Hidden per-project credit fees on top of a base subscription

• Weak field usability or connectivity requirements that slow down site visits

• No trial period to test accuracy against a known local roof

Which Solar Design Platform Is Right for Your Business?

There is no single best solar design software for every installer. A small residential crew closing five deals a month has very different needs than a growing commercial team handling carports and larger rooflines. Match the platform to your primary project type first, then weigh proposal tools, CRM integration, and pricing model against your actual sales volume. The checklist earlier in this article is a good starting point for that comparison.

Whichever platform you choose, GreenLancer can support the permitting, interconnection, and engineering work that happens after the design is finished. Fill out our contact form to talk with an account rep about your next project.

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FAQs About Solar Design Software in 2026

What is the best solar design software for a small residential installer?

OpenSolar is generally the strongest starting point for small residential installers, since the core platform is free and includes CRM and proposal tools built in. Arka 360 and Aurora Solar are worth considering once volume grows enough to justify a paid subscription.

What is the best solar design software for commercial or carport projects?

HelioScope is generally the strongest fit for carports, larger rooflines, and other light commercial layouts, since it is built specifically around commercial and industrial design and simulation. PVCAD by Enact Solar is a good option if your team needs an AutoCAD-based engineering workflow for more complex commercial sites.

Does this cover utility-scale solar design software?

No. Utility-scale ground-mount and tracker projects typically need specialized terrain, civil, and plant-optimization tools such as PVcase, RatedPower, or PVsyst. This article focuses on the residential and light commercial platforms installers use day to day.

Which solar design software integrates with CRM and financing platforms?

OpenSolar includes a built-in CRM, while Aurora Solar integrates with external CRM and sales platforms. Arka 360 offers CRM capabilities depending on the selected plan. Most platforms also support API connections to outside financing and procurement partners. Check each vendor's current integration list before committing, since partner networks change often.

What is the difference between solar design and solar proposal software?

Solar design software focuses on layout accuracy, shading analysis, and production modeling. Solar proposal software takes that design data and turns it into a branded, customer-ready quote with financing options. Most modern platforms combine both functions, but the underlying skill sets are different.

What is the difference between residential and commercial solar design software?

Residential platforms prioritize speed and financing tools for single-meter homes. Commercial solar design software adds multi-meter interval data, carports, and more complex electrical layouts than a typical residential system.

Does solar design software replace a licensed engineer or permit designer?

Solar design software does not eliminate permitting or professional review requirements. A qualified permit designer should verify the design against the locally adopted codes, and some projects require review or stamping by a licensed structural or electrical engineer..

Is free solar design software accurate enough for professional projects?

OpenSolar is the main example of a fully free, professional-grade platform. OpenSolar can support professional residential design and proposal workflows, but accuracy still depends on imagery quality, roof inputs, equipment data, shading assumptions, and designer review. More complex commercial work typically requires a paid platform with deeper engineering features.

How much does solar design software cost?

Pricing ranges from free platforms like OpenSolar to subscription tiers around $159 to $259 per month for platforms like Aurora Solar and HelioScope, plus separate credit-based options on some platforms. Total cost depends heavily on your monthly project volume and which integrations you need.

Is there solar design software without a monthly subscription?

OpenSolar is free with no subscription at all for the core platform. Pylon uses a pay-as-you-go model instead, charging roughly $4 to $10 per project rather than a flat monthly fee, which can work out cheaper for installers with lower or seasonal project volume.