Your Engineer Is Redoing Your Proposal Tool's Work
The handoff from proposal tools to construction documents is where solar engineering teams lose hours on every project. Here's what actually transfers — and what gets rebuilt from scratch.
Your Engineer Is Redoing Your Proposal Tool's Work
Somewhere in your company, a project manager builds a solar proposal in Aurora or Helioscope. Panels placed, production estimated, customer-facing proposal generated. The customer signs.
Months later, that project lands on an engineer's desk. They open AutoCAD and start over.
What transfers
The panel layout — where panels go on the roof. This usually survives, though the engineer often adjusts it for real structural constraints and field conditions the proposal didn't account for. General system specs. And a PDF the engineer references but doesn't import.
That's it.
What gets rebuilt from scratch
Strings. Every panel-to-panel connection, drawn as polylines on the correct layer, following the engineer's actual stringing configuration — not the rough grouping from the proposal tool.
Homeruns. Conductors from string endpoints to combiners or inverters, routed around obstructions through conduit paths with clean geometry. Proposal tools don't produce homerun routing because it requires site-specific constraints that don't exist at the proposal stage.
Cable lengths. Measured from actual polyline geometry and exported to a schedule. These determine material procurement — the bill of materials someone orders wire from. Proposal estimates are ballpark figures, not construction quantities.
Tags, dimensions, layers. String identifiers, circuit numbers, equipment labels, setback distances, conduit dimensions — all following the engineer's (or client's, or AHJ's) specific standards. None of this has any reason to exist in a proposal.
Why the gap exists
This isn't a failure of proposal tools. Aurora and Helioscope are excellent at what they do. The gap exists because proposals and construction documents answer fundamentally different questions.
A proposal answers: how many panels, how much energy, what will it cost?
A construction document answers: what exactly does the installation crew need to build?
Different disciplines. Different tools. Different users. The people creating proposals are often not the people producing construction documents — and the proposal may be created months before engineering begins, sometimes by a different company entirely.
The question nobody asks
Why is the engineering team spending most of their time on work that isn't engineering?
The proposal team has tools. The estimators have tools. The project managers have tools. But the engineers — the most expensive technical resource in the company — are drawing polylines by hand.
The gap between proposal tools and construction documents isn't going to close by making proposal tools more powerful. And it isn't going to close by replacing AutoCAD. It closes by automating the drafting work that lives between the engineer's decisions and the finished construction document.
The engineering stays with the engineer. The proposal tool keeps doing what it does well. The hours of manual CAD work in between get compressed from an afternoon into minutes.
Leaf fills the gap between your proposal tool and your finished construction documents. Strings, homeruns, cable lengths, and tags — automated in AutoCAD. Start a 14-day free trial — no credit card required.