Single-line diagrams and plan sets
Preliminary design to plan set, in minutes.
A Solesca plan set is a three-page interconnection package: site plan, single-line diagram, equipment settings. It leaves as a PDF and as DXF, one file per page. An add-on to the Engineering License, licensed per organization; a licensed PE partner stamps it.
Stampable plan sets
Use your in-house engineer, a third party, or a Solesca stamping partner.
PDF and DXF
A PDF plus a DXF folder holding the images and one DXF file for each page.
Up to three transformers
The stampable ceiling, which usually works out around 15 MW.
What does a Solesca plan set include?
Sheet one: the site plan.
The array on satellite imagery with every module, the placed equipment, the parcel boundaries and the roads.
- Every module, placed from the design rather than redrawn
- Inverters, transformers and switchgear where engineering put them
- The point of interconnection and the route to it
Sheet two: the single-line diagram.
Power traced from the modules to the utility grid, left to right, with string counts, inverter grouping and the conductor schedule read from the electrical model.
- Strings, inverter and panelboard, switchboard and meter, the point of common coupling
- Existing meter and breaker details entered on behind-the-meter systems, not inferred
Sheet three: equipment settings.
The equipment list, the notes, and the inverter and relay settings, on a sheet of their own.
- Written from the same model as the site plan and the diagram
- Leaves as PDF and as DXF, one file per page
What value do Solesca's plan sets have?
- One model, two deliverables
- AC stringing, inverter amperages and the DC string schedule feed the diagram from the same model that produced the layout.
- Nothing typed in twice
- The equipment list on page three describes the equipment on page one because neither was entered by hand.
- About a week, or minutes
- In our conversations with C&I developers, a contracted plan set comes back in about a week. In Solesca, design to plan set takes minutes.
The detail, if you want it.
Everything above, answered plainly. Open what applies to you.
What is in a Solesca plan set?
The package is three pages. The site plan shows the array on satellite imagery with every module, the placed equipment, parcel boundaries and roads. The single-line diagram traces power from the modules to the utility grid. The equipment settings page carries the equipment list, the inverter and relay settings, and the notes.
You get a PDF and a DXF folder holding the images and one DXF file for each page, so the drawing opens in whatever your engineer of record reviews it in. Nothing about the hand-off assumes they work the way you do.
What configurations does the single-line diagram cover?
Behind the meter, front of the meter, and new-service ground mount, across rooftop, carport and ground-mount projects. Behind-the-meter systems let you set the connection method as a breaker, a line-side tap or a load-side tap, and enter the existing meter and breaker details rather than leaving a drafter to infer them.
AC stringing, inverter amperages and the DC string schedule all feed the diagram from the same model that produced the layout. The equipment list on page three describes the equipment on page one because neither was typed in twice.
How large a system can Solesca draw?
Stampable drawings export for systems up to three transformers, which usually works out around 15 MW. Past that the export still runs, carrying a disclaimer that marks it for reference only.
Most C&I and community solar work sits well inside that limit, so it rarely comes up. A large ground-mount site can reach it, and that is worth knowing before a permitting cycle rather than during one.
Do I need the Engineering License for plan sets?
Yes. Plan sets and single-line diagrams are an add-on to the Engineering License, drawn from the AC equipment placement and DC stringing that license adds. The Design License cannot take the add-on.
The add-on is licensed once for the organization rather than per package. The stamp is the one cost that varies, because the PE partner bills it at market rate through SOL Credits.
Who stamps it, and what does a plan set cost today?
A licensed PE partner stamps it, billed at market rate through SOL Credits, and the rate varies with the state and the complexity of the project. The split is not a technicality: an engineer of record takes on liability at the moment they sign, and no software vendor can carry that for them.
In our conversations with C&I developers, a contracted plan set runs $1,500 to $3,500 and comes back in about a week. That is the baseline this package gets measured against, and the comparison worth running is a project where you already hold both the drawing and the invoice.
Does Solesca stamp the plan set?
No. Solesca produces the plan set and the single-line diagram; a licensed PE partner reviews and signs them in the jurisdiction the project sits in. Your own in-house engineer or a third party can seal the set instead, because the drawings leave as PDF and DXF.
What changes for a team that stops redrawing?
The disagreement between the bid layout and the permit drawing usually surfaces at the point where it costs the most to settle. Carrying one model from bid to permit removes the rebuild where that disagreement is born.
Onyx Renewables stopped treating design as a front-of-project activity once that rebuild went away, and now updates designs through construction and project completion. That is their account of their own projects rather than a Solesca benchmark. A team already carrying one model from bid to permit will find less to gain here.
What file formats does it export?
A PDF, plus a DXF folder containing the images and one DXF file for each page of the package.
Bring a project you have already permitted
Run the package against a plan set you have already paid for and had signed. Compare the sheets, the equipment list and the turnaround. Thirty minutes with our U.S.-based engineering team.