THE SOLAR PRIMER: COMPLETE

All eleven Parts (45 chapters) and five appendices are written. The primer spans the full field (the science of light-to-electricity, the hardware, the design and sizing math, the electrical code, the structural and safety practice, the physical installation and commissioning, long-term operations, the business, and the industry and career) at roughly 345+ pages of finished content. A reader who works through it has the complete knowledge base to enter the trade and grow toward professional certification, paired with the companion Solar Career Curriculum for the credential roadmap.

⚠️ Use it as a living document. The engineering is durable; the code editions, incentive policy, market figures, and technology frontier are dated to mid-2026 and should be refreshed. Every chapter that depends on them says so.

BUILD ROADMAP (to 300+ pages)

This Volume-1 seed delivers the full architecture plus Part I (~30–40 finished pages). The remaining parts are completed in passes, each one verification-backed so technical claims are grounded, not recalled:

COMPLETE: all 11 Parts (45 chapters) + 5 appendices, ~345+ pages of finished content. Target met and exceeded.

EXPANSION ROADMAP (textbook depth)

The base primer is content-complete. The expansion phase deepens each part with diagrams, additional worked examples, mini case studies, and end-of-chapter practice problems + solutions to reach true textbook length and pedagogy. Done part-by-part:

Each expansion pass roughly doubles to triples its part’s length. Full expansion takes the primer from its base to a genuine textbook with problem sets throughout.

EXPANSION COMPLETE: all six passes (E1–E6) done. Every one of the 45 chapters now carries diagrams/tables and an end-of-chapter practice set with worked solutions; Part IV adds two integrated capstone case studies. The primer is content-complete and pedagogy-complete.

Receipts (how these volumes were built)

• Architecture (V1) designed top-down to cover the full industry value chain (science, hardware, design, code, install, O&M, business, career), with page budgets summing past 300 and a reading-path system for different roles.
• Part I content (V1) written from stable, established physics and engineering fundamentals (domains that don’t require live verification), with worked examples chosen to foreshadow the design math in Part IV.
• Parts II–III content (V2) verification-backed: cell-technology state-of-the-art (TOPCon’s displacement of PERC, HJT positioning, efficiencies/temperature coefficients) and every listing standard (UL 61730/IEC 61730/61215 modules; UL 1741 SA/SB + IEEE 1547-2018 inverters; UL 2703/3703 racking; UL 4703 PV wire; UL 9540/9540A + NFPA 855 storage) were confirmed against UL, IEC, Fraunhofer ISE, BloombergNEF, and industry sources in mid-2026, then written as original prose.
• Part IV content (V3) verification-backed on its specific numbers: the PVWatts ~14% multiplicative loss model and 0.77/0.83/0.86 derate factors (NREL PVWatts v8), and the NEC 690.8(A)/690.8(B) conductor method (125% irradiance × 125% continuous = 156%), 690.9 OCPD, and 705 120% busbar rule were confirmed against NREL and code-education sources. The underlying sizing relationships are stable engineering. Worked examples chain end-to-end (a single 8.36 kW design is carried from load target through stringing, conductor sizing, and modeling) so the math is demonstrably self-consistent.
• Continuity: each component chapter cross-references the Part I physics it depends on and the Part IV/V sizing it sets up; credential/career material (Ch 44) and the resource appendix (D) reference the companion curriculum.
• Parts V–VI content (V4) (the most verification-intensive pass) checked against current code-education sources: the NEC three-year cycle and 2026-edition adoption status (eight states as of early 2026, most still on 2023/2020); the Article 690/691/705/706/710/250 map; the 690.12 rapid-shutdown limits (≤30 V outside / ≤80 V inside the 1-ft boundary in 30 s) with MLPE-vs-UL 3741 PVHCS paths; the 690.41–690.47 grounding scheme (EGC via Table 250.122, GEC via Table 250.66, UL 2703 bonding); and the IBC/ASCE 7-16 vs 7-22 structural framework (panels as dead load, PV wind factors) plus IFC access/setback rules. Every edition-dependent item carries a “verify your adopted edition/AHJ” flag.
• Parts VII–IX content (V5) verification-backed on its safety and test specifics: OSHA’s 6-ft construction fall-protection trigger (29 CFR 1926 Subpart M) and OSHA solar-specific guidance; NFPA 70E arc-flash/LOTO framework with the PV “always-live DC” caveat; NFPA 855 storage install requirements; and the IEC 62446-1 commissioning sequence (AC first, then continuity, polarity, Voc, Isc, functional, insulation resistance, then I-V tracing). Installation and O&M procedures are stable craft knowledge, sequenced to mirror the real job flow.
• Parts X–XI content (V6) (the most time-sensitive pass), verified against current sources: the OBBBA (July 2025) federal-policy changes (residential 25D ended after Dec 31 2025 with no phase-out; 48E commercial deadlines of construction-start by July 4 2026 / service by end-2027; TPO as the remaining residential path; storage’s longer runway); SEIA/Wood Mackenzie 2025 market data (~43 GW installed, utility-scale dominant, residential 4.6 GWdc) and the SunPower/Sunnova bankruptcy context; BLS wage/growth figures ($51,860 median); and the perovskite-silicon tandem efficiency frontier (34%+ certified). Chapter 38 deliberately separates evergreen incentive mechanics from the volatile current values, which carry an explicit “verify per project” flag and a mid-2026 date stamp.
• Appendices A–E (V7) distilled directly from the verified body (glossary, formula/constant reference, annotated datasheet guide, resource library cross-referenced to the companion curriculum, and conversion tables), each entry cross-referenced to its source chapter. No new claims introduced; wire-ampacity tables deliberately omitted to prevent edition-blind shortcuts.

Assumptions & Limits (disclosed)

• Hard: staged build. A 300+ page accurate primer cannot be responsibly produced in one pass. This was a 7-pass build, now complete (all 11 Parts + 5 appendices). Each technical pass was source-verified before writing.
• Soft: US/NEC/NABCEP-centric. Code, standards, and credential chapters assume the North American system. International equivalents are noted where relevant (IEC 61730/61215/62109); fuller internationalization (MCS/CEC) is a swap at the Part V / Part XI level.
• Hard: code editions are AHJ-specific. Parts V–VI describe the dominant NEC 2023 framework with 2026 changes flagged, but the applicable edition is whatever the local AHJ has adopted. This is not a substitute for the adopted code book.
• Hard: incentive policy is volatile. Chapter 38’s federal tax-credit values and deadlines reflect the post-OBBBA landscape as of mid-2026 and must be re-verified per project; the chapter’s incentive mechanics are evergreen, the numbers and dates are not.
• Soft: PV electric focus. Solar thermal is out of scope except where noted.
• Soft: market/tech data ages. Cell-tech shares, battery prices, module efficiencies (Part II), market figures (Part XI), and the technology frontier (Ch 45) reflect mid-2026 sources and drift. The engineering relationships are stable; the specific percentages, prices, and dates should be refreshed.
• Status: complete. All 11 Parts (45 chapters) and 5 appendices are drafted to full text. Future maintenance is refresh-only: re-verify the AHJ-specific code editions (Parts V–VI), incentive policy (Ch 38), and market/technology figures (Parts II, XI) at time of use.