Structural & Electrical Engineering
PE-stamped structural and electrical calculations confirming the roof, mounting system, and electrical infrastructure can safely support the proposed array.
Who this service is for
- Installers whose AHJ requires stamped structural or electrical calculations
- EPCs that need engineering documentation for non-standard roof or electrical conditions
- Contractors submitting to jurisdictions with stricter engineering review requirements
What's included
Structural calculations
Roof and rafter capacity analysis confirming the mounting system and array load are supported.
Attachment & racking review
Verification of the racking/attachment method against structural requirements.
Electrical calculations
Conductor sizing, overcurrent protection, and interconnection calculations for the system.
Stamped plan set pages
Calculation summary pages prepared for inclusion in the permit package.
How structural & electrical engineering works
1. Design & site data received
Structural/electrical inputs come from the completed design and site assessment.
2. Calculations performed
Structural and electrical calculations are completed against applicable code requirements.
3. Review
Calculations are reviewed for accuracy and completeness before stamping.
4. Stamped documents delivered
Stamped calculation pages are delivered for inclusion in the permit package.
Information we'll need
Have this ready when you submit a design request:
- Completed PV layout and single-line diagram
- Roof material, rafter size, and rafter spacing
- Racking/mounting system model
- Main service panel bus rating, location, and breaker size
- Proposed system size
Deliverables
What you'll receive back:
- PE-stamped structural calculations
- PE-stamped electrical calculations
- Attachment/racking verification
- Calculation pages formatted for the permit package
Request stamped calculations
Submit your design and site details, and our engineering team will prepare the required calculations.
Structural & Electrical Engineering — frequently asked questions
This varies by jurisdiction and by project specifics (roof type, structural condition, system size). Your local AHJ’s permit checklist is the authoritative source — we confirm this as part of the permitting review.
Accurate roof material, rafter size/spacing, racking model, and electrical panel details are essential inputs — see the "Information we’ll need" list above.
Not always — some jurisdictions require one, both, or neither depending on system size and site conditions. We scope this per project rather than assuming both are needed by default.