The best e-signature app for solar installers, from proposal to PTO

What gets signed on a solar job

• The proposal and installation agreement: system size, equipment, estimated production and price, signed at the kitchen table or on a video call.
• Finance documents: loan, lease and PPA paperwork, which often comes through the finance partner's own system rather than yours.
• Authorizations: the homeowner's permission for you to apply for permits, interconnection and incentives on their behalf, plus HOA architectural approval where there is one.
• Change orders: a main panel upgrade, a trenched run to a detached garage, or a new layout after the site survey.
• Completion sign-off: the final walkthrough, often a milestone for getting paid.

Five tools compared

Strengths and gaps

OpenSolar: free, with three ways to sign

OpenSolar is free for solar professionals; its page says manufacturers, finance companies, distributors and other partners pay to be on the platform. It has a built-in signing workflow, and you can connect DocuSign or PandaDoc instead when you need countersignatures, generated documents or DocuSign's authentication options. Customers can sign from inside the proposal. The catch with a partner-funded platform is that partners shape what's on offer, so check that your lenders and suppliers are there.

Aurora Solar: design first

Aurora is a design and sales platform. Its plans list tablet-friendly proposals, financing from Goodleap, Dividend, Mosaic and others, and a Contract Manager with e-signature tools and customizable sales agreement templates. Basic is $159 per user a month billed monthly, or $135 on an annual plan; Premium is $259, or $220 annually. The pricing page doesn't make clear which tier includes Contract Manager, so ask before you count on it.

Enerflo: contracting for sales organizations

Enerflo is built for solar sales teams. Its Docflo system generates contract packages and compiles every required document into one signing packet, signed by email or in person, while Lendflo routes deals across lenders for loans, leases, PPAs and cash deals with escrow. An install tracker follows the job from contract to PTO. There's no public price; you book a discovery call. It suits dealers and EPCs pushing volume through several finance partners.

PandaDoc: polished proposals

PandaDoc builds sales proposals and other documents, with e-signatures on every plan and approval workflows on Business. Starter is $19 per seat a month and Business $49, both billed annually. Business adds unlimited templates, a content library, CRM integrations and payment collection, while bulk send and web forms use paid usage credits. It's also one of the two providers OpenSolar connects to. It doesn't design systems, so the production numbers come from your design tool.

SignMaster: the paperwork around the sale

SignMaster doesn't design arrays or quote financing. It helps with what the platforms don't template: utility and permit authorization letters, HOA packets, panel-upgrade change orders, agreements with your electrical and roofing subs, and the completion sign-off, signed in person or from an email link, each with a certificate of completion. The library has a solar installation agreement to start from, and signing pages come in 6 languages, Spanish and Vietnamese among them.

Which one fits your business

• A small installer that wants design, proposals and signing at no cost: OpenSolar.
• Remote design accuracy matters most and you'll pay for it: Aurora, once you've confirmed which tier has Contract Manager.
• A sales organization with many reps and several lenders: Enerflo.
• You sell with designed proposal documents and want them tied to your CRM: PandaDoc Business.
• Your design tool already handles the proposal and you need everything else signed: SignMaster.