Designing a solar PV system isn’t just about placing panels on a roof — it’s about delivering maximum efficiency, longevity, and compliance, all while keeping the client’s budget in check.
At One Place Solar, our recent Texas project — a 7.6kW rooftop system using Tesla inverters and Longi 400W panels — gave us plenty of insights. Whether you’re a beginner or an experienced solar designer, here are key takeaways and tips from this successful installation that you can apply to your next project.
Tip: Know how to integrate premium components like Tesla inverters and Longi panels without overcomplicating the system.
Why it matters: High-end doesn’t mean hard-to-install. We used one Tesla 7.6kW inverter and 19 Longi 400W modules. The system was simple, clean, and extremely effective.
✅ What to do:
Tip: String layout affects both efficiency and roof utilization.
In this project, we had two roof sections at different azimuths. To optimize, we created:
This avoided shading, matched orientation, and balanced voltage outputs across strings.
✅ Pro Tip: Always use simulation tools (like Helioscope or Aurora) to predict real-world output from different roof slopes and orientations.
Tip: Go with code-compliant, proven racking systems like K2 CrossRail with Splice Foot XL.
Why we used it:
✅ Design Consideration: Always align your rafter spacing with racking options. In our case, 2″x6″ rafters at 24″ O.C. worked perfectly with 48″ attachment spacing.
Tip: Design with utility requirements and NEC codes in mind from day one.
In this project:
✅ Your Checklist:
Tip: Always include rapid shutdown, clear labeling, and fire setbacks.
This system was:
✅ Reminder: Include labeling on DC conduit, inverters, junction boxes, and service panels. Keep a library of NEC-compliant labels ready in your CAD or design software.
Tip: Your Bill of Materials (BOM) isn’t just for procurement — it’s your signature as a designer.
We included:
✅ Pro Tip: A detailed BOM shows professionalism, ensures no missed items on-site, and improves approval rates from AHJs.
Every Authority Having Jurisdiction (AHJ) is different. This project had to follow:
Tip: Research your AHJ codes before designing.
Bonus Tip: Build a quick checklist template per city or county to speed up future projects.
A well-designed solar project blends engineering excellence with on-site practicality. It anticipates code requirements, makes installers’ jobs easier, and — most importantly — delivers long-term value for the client.
From Tesla inverters to racking to proper interconnection, this Texas project is a reminder that smart design isn’t just technical — it’s strategic.
Ready to level up your design game?
Keep learning, stay code-aware, and prioritize performance without overcomplicating.
Want help with permit sets, AHJ-ready designs, or system optimization?
📩 Reach out to One Place Solar — where design meets execution.
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