Permit guides, code compliance, and best practices from our engineering team. Updated weekly with real-world solar project insights.
They sound alike, but the National Electrical Code and the California Energy Commission's equipment list govern completely different things — and mixing them up is a common, avoidable reason CA solar + battery interconnections stall.
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More AHJs won't approve a permit on racking calcs alone anymore — they want a separate stamped letter confirming the existing roof framing can carry the added load. What it covers, and where it's showing up most.
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From missing PE stamps to rapid shutdown gaps to AHJ-specific checklist misses — the ten issues that send a plan set back for resubmission, and how to avoid each one.
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A Puerto Rico battery install navigating OGPe and LUMA, a 240 kW California commercial array, and a 2-day Texas residential Powerwall job — real project codes and turnaround times.
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A line-by-line comparison of price, turnaround, and what's actually included between the two — real numbers, not marketing copy.
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Yes — your AHJ requires a code-compliant, PE-stamped plan set, not proof you hired a full-service installer. Here's exactly what that means if you're self-installing.
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Fully self-installing, or hired an installer who doesn't stamp plans? A quick decision framework for which situation you're actually in.
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Navigate the permit process for residential and commercial solar installations across all 50 states. Requirements, timelines, and common pitfalls.
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Which states require professional engineer stamps for solar installations? Complete breakdown of PE requirements, exemptions, and typical costs.
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Master the interconnection process for PG&E, SCE, SDG&E, and other major utilities. Timeline expectations, common rejection reasons, and how to expedite approval.
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