Online Solar Design Tool 2026: Best Picks for Installers

An online solar design tool is now the default starting point for installers shipping under 50 systems per year. The buyer is not the enterprise engineering team picking a cloud-native stack for 100 designers; the buyer is the owner-operator running 1 to 5 crews who needs to go from a customer address to a permit-ready packet in under 20 minutes per project. The market has answered with five strong platforms that handle the full motion (address, 3D, layout, shading, proposal, permit packet) without an install. The question is which one fits the smaller installer’s volume, price ceiling, and conversion needs.

Direct answer. The best online solar design tool in 2026 is SurgePV (best end-to-end address-to-permit-ready motion in under 20 minutes at $1,299 to $1,899 per user per year), OpenSolar (best free-tier online tool for solo installers, monetized through proposal fees), Aurora Solar (best US residential brand recognition at $159 to $259 per month), Pylon (best entry-priced online tool at $59 per month), and HelioScope (best online commercial yield tool at $99 to $300 per month). SurgePV is the only online tool that pairs AI 3D layout with NEC 2023 SLD, AutoCAD DXF, and a white-label proposal in one license.

This guide is for the installer or sales-engineering hybrid shipping 1 to 50 systems per year who needs an online tool that converts on the first sales touch and produces a permit packet on the same day. The voice we are speaking to is the owner-operator who does not have an in-house design team and cannot afford a tool that requires a week of training before the first project closes. We name what online has to do for the installer buyer, who ships it best, and the trap that loses the most deals.

Why Online Beats Desktop for the Installer Buyer

The installer buyer wears three hats: salesperson, designer, and permit submitter. The online design tool has to compress all three jobs into one workflow. Desktop tools require an install on a Windows laptop, a stable office network, and a designer-grade learning curve. Online tools strip the install, accept any browser, and ship a UI that a salesperson can drive from a customer’s driveway on a tablet.

According to SEIA market research, US residential solar continues to install over 5 GW per year with installer count exceeding 10,000. The mid-market installer (under 50 systems per year) accounts for a large slice of that volume and shops for online tools, not enterprise design platforms.

The Online Design 5: Broader Buyer Intent

The installer buyer scores online tools on five dimensions. The dimensions are different from what an engineering team scores cloud-native platforms on. The installer cares less about audit trail depth and more about conversion speed and per-deal economics.

Platform 1: SurgePV Online Design

SurgePV ships the full installer motion in one browser tool: AI 3D from a street address in under 60 seconds, automated layout with 8,760-hour shading, NEC 2023 SLD generation, AutoCAD DXF and DWG export, and a white-label interactive proposal that the salesperson can present on a tablet at the customer’s kitchen table. The full address-to-permit-ready motion runs in under 20 minutes for a typical US residential project.

What SurgePV wins on for the installer is end-to-end coverage at a price that pencils on 20 to 50 systems per year. At $1,299 per user per year (5-team tier), the per-deal license cost is $26 to $65 depending on volume. That is cheaper than the variable per-proposal fees on OpenSolar and substantially cheaper than Aurora’s per-seat pricing. What SurgePV trades is the install-and-go familiarity that brand-name tools like Aurora carry with mature US national installers.

For the installer evaluating residential solar design tools, SurgePV is the buy that pays back the fastest on conversion-to-permit cycle time.

Platform 2: OpenSolar Online Design

OpenSolar is the free-tier anchor for solo installers and small teams. The base platform is free and the monetization is through hardware partner referrals and a percentage fee on financed proposals. The strength is zero upfront cost; an installer can run their first 10 deals before paying anything. The trade is the variable cost line on financed proposals (typically 1 to 2 percent of system price), which compounds at higher volume. Across 30 deals at $30,000 per system, the percentage fees can exceed a paid SurgePV or Aurora license. See our OpenSolar alternatives breakdown for the full trade analysis.

OpenSolar also ships strong proposal templates and a clean mobile experience, two things that matter to the installer buyer. The engineering depth (shading granularity, structural support, NEC SLD output) is thinner than SurgePV or HelioScope.

Platform 3: Aurora Solar Online Design

Aurora is the brand-recognized US residential design platform. For the installer who pitches against national competitors, the Aurora proposal carries name recognition with homeowners who have shopped multiple bids. The trade is price: $159 to $259 per month per seat means $1,908 to $3,108 per year per user, which is roughly 50 to 100 percent higher than SurgePV at the team tier. Aurora’s proposal output is polished; the engineering depth (especially commercial and structural) is bounded compared to SurgePV. See our full Aurora Solar alternatives breakdown and our aurora-vs-helioscope-vs-heaven-designs comparison.

Platform 4: Pylon Online Design

Pylon is the entry-priced online design tool at $59 per month. The target buyer is the very small installer (1 to 10 systems per year) who needs a basic online tool without committing to Aurora-tier per-seat costs. The strength is price and a focused proposal flow. The trade is engineering depth: Pylon ships proposal-grade output, not lender-grade or permit-grade yield analysis. For permit packets and SLD output, the installer either uses Pylon for proposal and routes engineering to a service partner (like Heaven Designs) or steps up to a more capable online tool. See our Pylon alternatives comparison.

Platform 5: HelioScope Online Design

HelioScope is the cloud commercial yield tool with strong online motion for C&I bids. For the installer who mixes residential and small C&I, HelioScope’s stringing engine and per-string yield reports give a stronger commercial proposal than the residential-focused tools. The trade is residential UX: HelioScope is more engineering-oriented than sales-oriented, so the residential close motion is slower than on Aurora or OpenSolar. See our HelioScope alternatives comparison and our Helioscope-vs-Aurora breakdown.

Comparison Table

Tool	Address-to-proposal	Permit packet output	White-label proposal	Best for	Price
SurgePV	Under 20 minutes	Yes	Yes	Installer 10 to 50 systems per year	$1,299 to $1,899 per user per year
OpenSolar	Under 25 minutes	Partial	Yes	Solo installer, zero upfront	Free plus referral fees
Aurora	Under 30 minutes	Yes	Yes	Brand-conscious US residential	$159 to $259 per month
Pylon	Under 20 minutes	No	Limited	Very small installer	$59 per month
HelioScope	Under 40 minutes	Yes	Basic	Residential plus small C&I	$99 to $300 per month

SurgePV: Pros and Cons

The Hidden Cost of Picking the Wrong Online Tool

The reverse trap is buying an engineer-grade tool (HelioScope, PVsyst) and watching the kitchen-table conversion drop. A sales-led installer who has to walk a homeowner through a PVsyst yield report at the dining room table will lose deals that an installer with a clean white-label proposal wins.

Conversion Math for the Installer Buyer

The single biggest lever for the installer is conversion rate at the visit. A 25 percent at-visit close rate at 100 leads per year is 25 deals. A 35 percent at-visit close rate at the same lead flow is 35 deals. The 10-deal difference at a $30,000 average system price is $300,000 in revenue and roughly $20,000 to $40,000 in margin, depending on the cost structure.

The online tool decides the at-visit close rate. The features that lift the rate the most:

1. Interactive proposal viewable on a tablet at the visit. The customer scrolls financing scenarios, sees the panel layout on their roof, and signs digitally without leaving the visit.
2. Real production estimates with confidence ranges. A clean P50 yield with a P75 and P90 band reads as honest engineering instead of optimistic sales math.
3. Same-visit financing options. Pre-integrated lender quotes that the customer can compare in the proposal.

SurgePV, Aurora, and OpenSolar ship strong interactive proposals. HelioScope and Pylon are weaker on the interactive proposal motion. The 5-to-10-percentage-point conversion lift from a strong proposal compounds across every deal the installer pitches.

Permit Packet Output: What the Installer Buyer Needs

A permit packet is more than a proposal. The AHJ typically requires a site plan, panel layout drawing, electrical SLD, structural calc, and (in many US jurisdictions) a rapid shutdown placement diagram per the NFPA NEC 2023. Online tools split into three camps on permit output:

1. Full permit packet. SurgePV, Aurora ship the SLD and layout drawing in the base license; structural calc requires either a partner or the AutoCAD DXF export to an engineer.
2. Partial packet. OpenSolar, HelioScope ship the layout and basic SLD; structural is a separate workflow.
3. Proposal only. Pylon and similar entry tools stop at proposal; the installer assembles the permit packet manually or via a service partner.

For installers shipping under 20 systems per year, partial-packet plus service partner often pencils. For installers above 20, a full-packet online tool pays back inside three months. See our solar permit design service overview for the structural and AHJ handling.

What About AHJs in Different States?

US AHJs vary dramatically. California requires rapid shutdown on most residential. Florida wind load drives unique structural requirements. New York fire code is strict on access pathway. The online tool has to ship to all of them or the installer rebuilds the packet by state. SurgePV’s NEC 2023 SLD output covers the major US AHJ requirements; Heaven Designs files cover 38 states for the AHJ-specific structural and signage. See our state-specific California AHJ guide, Arizona permit guide, and Colorado permit guide for jurisdiction detail. The AHJ glossary entry defines the term for buyers new to the space.

Online Tool Plus Service Partner: The Modern Combo

The pattern that wins for installers in the 10 to 50 systems per year range is online tool plus on-demand engineering service partner. The installer runs an online tool (SurgePV, Aurora, OpenSolar) for the sales-and-proposal motion and routes the engineering deliverables (structural calc, AHJ-specific signage, complex SLDs) to a service partner like Heaven Designs.

The economics: a $1,299 online tool license plus $200 to $350 per project on engineering services across 30 deals is $7,300 to $11,800 total. An in-house engineer at $90,000 fully loaded is uneconomic until the installer crosses 100 plus deals per year. The combo gives the installer professional engineering output without the headcount cost. See our deeper notes on Aurora Solar alternative for Indian EPCs and the broader solar design software landscape for context.

Lead Magnet

How Heaven Designs Helps

Heaven Designs is the engineering service partner that scales with the installer using an online tool. We ship the 3D model, shading run, SLD, structural calc, and permit packet from any installer-side stack (SurgePV, Aurora, OpenSolar, HelioScope) and integrate into the installer’s existing online tool. Thousands of packets per quarter, 96.2 percent first-pass residential AHJ acceptance, 94.1 percent C&I, 38 US states.

For installers running an online tool but needing engineering depth on permit and structural, we run solar permit design and detailed engineering design on a fixed turnaround. For ground-mount projects, our ground-mount design service ships the racking and grading calcs. For pre-construction projects, our 3D pre-design service ships the model. To start, contact us with the project address and we will return a fixed-fee quote within 24 hours.

To see SurgePV’s online installer motion in action, book a SurgePV demo, view SurgePV pricing, or read the for installers page. For the proposal-side close motion, the solar proposals page covers the white-label flow. Installers who need CRM-side help to manage the sales pipeline can pair with QuickEstimate.

FAQ

What is the cheapest online solar design tool that works for permit packets?

SurgePV at $1,299 per user per year (5-team tier) is the cheapest online tool that ships a permit-ready packet (SLD, layout, AutoCAD DXF) in the base license. OpenSolar is cheaper at the entry point but uses partial-packet output. Pylon at $59 per month is the cheapest license but does not ship a full permit packet.

How fast can I go from address to a signed deal with an online tool?

The fastest online tools (SurgePV, Aurora, OpenSolar) ship an address-to-proposal motion in under 20 minutes. Add 5 to 15 minutes for the homeowner to scroll financing scenarios and sign, and the at-visit close motion runs in under 35 minutes. Installers shipping at this pace see 5 to 10 percentage points of close rate lift versus the office-based proposal workflow.

Do I need an in-house engineer if I use an online design tool?

For under 50 systems per year, no. The online tool plus an on-demand engineering service partner (like Heaven Designs) ships at a lower total cost than the in-house engineer headcount. Above 100 systems per year, an in-house engineer starts to pay back.

Can I switch online design tools without losing my project history?

Project history transfer between online tools is limited. Most platforms export PDFs and basic site plans, but the 3D model, shading run, and proposal templates do not transfer cleanly. Plan a 30 to 60 day overlap period where the team runs both tools while wrapping the old projects on the legacy platform.

How do AHJs treat designs from online tools?

AHJs care about the output (site plan, SLD, structural calc), not the tool. SurgePV and Aurora ship NEC 2023 SLD output that the major US AHJs accept. OpenSolar’s basic SLD is accepted by many AHJs but rejected by some that want the more detailed stringing diagram. For stricter AHJs (parts of California, New York, Hawaii), pair the online tool with a service partner like Heaven Designs.

What is the minimum volume to justify a paid online tool versus free OpenSolar?

Around 12 to 15 deals per year. Below that, the OpenSolar percentage fees on financed deals stay lower than the SurgePV or Aurora annual license. Above that, the paid tool’s flat fee wins on per-deal cost.

What does Heaven Designs charge for engineering services to support an online tool?

Fixed-fee, typically $150 to $350 for residential and $0.02 to $0.05 per watt for C&I depending on project complexity and turnaround. Pricing details are on the contact page and we return a quote within 24 hours.