The Part of Solar Engineering That Doesn't Scale

A solar EPC wins more work. The pipeline fills out. Then the engineering team hits a wall — not because the projects are harder, but because construction documents take the same number of hours to draft whether the company is doing 5 projects a month or 15.

The linear trap

A senior engineer with 10 years of experience draws polylines at roughly the same speed as a junior with two. They make better engineering decisions, but the mechanical act of drafting has a speed ceiling that experience doesn't raise. So when the pipeline grows, you hire. Each new hire adds the same fixed capacity. Twice the engineers, twice the output, twice the payroll. Revenue grows, but margins stay flat.

The Bureau of Labor Statistics reports the median salary for electrical engineers at $108,170/year. The Solar Energy Industries Association reports U.S. commercial solar installed 5.6 GW in 2024 — a record. More projects, same drafting bottleneck at every firm.

That's the definition of "doesn't scale" — no leverage, no compounding, just linear headcount growth.

Where the hours actually go

On a typical commercial rooftop project (500kW, ~1,200 panels), the engineering decisions — string configuration, equipment selection, code compliance — take roughly 30-60 minutes. The drafting — drawing strings, routing homeruns, measuring cables, placing tags — takes 3-5 hours. The ratio is consistent: approximately 65% of an engineer's day goes to drafting, 35% to engineering.

The bottleneck isn't "we don't have enough people who can make engineering decisions." It's "we don't have enough hours in the day to draw everything."

Why hiring doesn't fix it cleanly

Engineers are expensive, and if 70% of their time is drafting, 70% of that salary is paying for drafting at engineer rates. They're hard to find in a tight labor market. They take months to ramp — a new hire spends their first 6-9 months learning your CAD standards, layer conventions, and drafting procedures before they're doing real engineering work. You're paying an engineer's salary to train a drafter.

Outsourcing shifts the bottleneck without removing it. External teams don't know your standards, turnaround takes days instead of hours, and review cycles consume engineer time that partially offsets the benefit.

What leverage looks like

The bottleneck breaks when one engineer can produce the drafting output that used to require two or three. Not by working longer hours — by automating the mechanical portion of the workflow.

The engineer still makes every engineering decision. But instead of spending hours translating those decisions into CAD geometry, the drafting executes in minutes. The same team handles more projects. Margins improve. Senior engineers spend time on engineering review and mentorship instead of drawing polylines. New hires start contributing real engineering value sooner because the drafting learning curve compresses.

| | Before | After | |---|---|---| | Drafting share of engineer's day | ~65% | ~25% | | Engineering share | ~35% | ~75% | | Effect on same team of 4 | 56 hrs/wk engineering capacity | 120 hrs/wk engineering capacity |

The projects are there. The question is whether your team has the capacity to take them — and whether the answer has to be "hire more people."

Leaf automates the drafting work that limits engineering throughput. Same team, more projects. Start a 14-day free trial — no credit card required.