Top Mistakes Engineers Make When Submitting Solar Plans Without PE Stamps

In the fast-growing solar energy industry, engineers play a critical role in designing and implementing efficient and compliant solar power systems. However, one of the most overlooked aspects of the submission process is securing proper Solar Engineering Stamps. Skipping this essential step can lead to project delays, legal issues, and even outright rejection by permitting authorities. Here are the top mistakes engineers make when submitting solar plans without Professional Engineer (PE) stamps — and how to avoid them.

1. Underestimating Local Jurisdiction Requirements

One common mistake is assuming that Solar Engineering Stamps are optional. In reality, many local and state jurisdictions require a PE stamp for permitting, especially for commercial or large-scale residential systems. Failing to research and comply with these requirements can result in denied permits or costly redesigns.

Tip: Always verify the latest permitting regulations in your state or municipality before submission. Requirements can vary drastically between regions.

2. Believing “Standard” Designs Don’t Need Approval

Some engineers believe that if a solar system follows a standardized layout, it doesn't need a PE review. This is a risky assumption. Every solar installation has unique characteristics such as roof load, electrical connections, and geographic location that could affect safety and performance.

Solar Engineering Stamps act as a professional assurance that all calculations and specifications meet current codes and standards.

3. Ignoring Structural Load Considerations

When engineers skip PE stamps, they often miss critical structural assessments, especially for rooftop solar installations. Issues like wind uplift, snow loads, and roof age can compromise the safety and longevity of the system. A licensed PE evaluates all these factors to ensure the structure can support the array safely.

Mistake to Avoid: Assuming the existing structure is sufficient without a structural engineer’s sign-off.

4. Overlooking Electrical Code Compliance

Another frequent oversight is the assumption that if the system works electrically, it will pass inspection. But inspectors are looking for strict compliance with the National Electrical Code (NEC), which a PE must verify.

Solar Engineering Stamps confirm that the electrical design meets NEC standards, including wire sizing, overcurrent protection, and grounding requirements.

5. Trying to Cut Costs

While skipping a PE stamp might seem like a money-saving tactic, it often backfires. Delays, rework, or failed inspections can increase project costs significantly. Plus, without a PE’s professional liability, the risk shifts entirely to the installer or contractor.

Pro Tip: The upfront cost of Solar Engineering Stamps is small compared to the potential expense of non-compliance.

Conclusion

Professional Engineer stamps are more than just regulatory checkboxes—they’re a critical quality assurance tool that ensures your solar design is safe, code-compliant, and structurally sound. Avoiding the mistakes listed above can help you streamline project approvals, maintain your professional reputation, and build trust with clients and authorities alike.

If you're planning your next solar installation, make sure Solar Engineering Stamps are part of your design and submission process from the start.