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The 120% Rule for Solar: NEC 705.12 Calculator and Guide
The 120% rule trips up more solar permits than almost any other NEC requirement. Here's how NEC 705.12 actually works, how to calculate compliance, and what NEC 2023 changed.
Sarah Lozanova
4 days ago
Ground Mount Solar Permit Requirements & PE Stamps
Guide to ground mount solar permit requirements, structural engineering, setbacks, NEC 690, wind loads, grounding, and permit package needs for installers.
Sarah Lozanova
Aug 27
NEC 690.8 Solar Conductor Sizing: Ampacity, Derating & Wire Selection
NEC 690.8 conductor sizing for solar installers: the 125% rule, temperature derating, conduit fill, wire types, plus an interactive calculator to check your own conductor ampacity numbers.
Sarah Lozanova
Aug 27
Solar Panel Wiring Diagrams & Guide for Installers
A huge part of any solar project is how to wire the solar panels. Explore our guide on solar panel wiring to learn best practices.
Team GreenLancer
Aug 27
Solar PE Stamping Services: Wet Stamp & Permit Guide
PE stamping services explained for solar installers — what a wet stamp means, when you need a structural or electrical engineer stamp, and how to get your solar PV permit package approved.
Team GreenLancer
Aug 25
2023 NEC Solar Code Guide for Installers
A practical guide to the 2023 NEC solar code for installers, covering Article 690, rapid shutdown, labeling, source connections, grounding, ESS, and the permit details that can prevent redlines.
Sarah Lozanova
Aug 25
MPPT Solar Charge Controllers: Sizing, Selection & Wiring
An installer's guide to MPPT solar charge controllers for battery-based PV systems. Covers sizing, ratings, battery chemistry, wiring, manufacturer comparison, and field troubleshooting.
Sarah Lozanova
Aug 25
Solar Battery Storage Permits: ESS Requirements for Installers
Solar battery storage permits explained: NFPA 855 ESS clearance and setbacks, NEC 706, fire review, and permit docs for installers.
Sarah Lozanova
Aug 25
Solar One Line Diagram (SLD) Requirements: Installer Guide
What goes on a solar one line diagram, what NEC 690 requires, why SLDs get rejected at plan check, and how storage changes your permit package. A practical guide for solar installers.
Sarah Lozanova
Aug 25
Solar Rapid Shutdown Requirements: NEC 690.12 Guide For Installers
A complete NEC 690.12 rapid shutdown guide for solar installers: array boundary limits, MLPE vs PVHCS, combiner box and wire size questions, commercial rooftop rules, and 2026 code changes.
Sarah Lozanova
Aug 24
Virginia Solar Permit and Interconnection Requirements: 2026 Installer Guide
A 2026 guide for Virginia solar installers covering permits, USBC codes, DPOR licensing, Dominion and APCo interconnection, net metering, coastal wind loads, plan sets, PE stamps and delays.
Sarah Lozanova
Aug 11
Utah Solar Permit and Interconnection Requirements
Utah solar permit and interconnection guide for installers: AHJ rules, S202/E200 licensing, Rocky Mountain Power Schedule 137, PE stamp triggers, HOA solar law, and storage permitting requirements.
Sarah Lozanova
Aug 11
Colorado Solar Permit and Interconnection Requirements
A 2026 guide to Colorado solar permitting and interconnection for installers, covering AHJ rules, net metering, snow load requirements, and the state licensing changes underway through 2029.
Sarah Lozanova
Aug 11
Massachusetts Solar Permit Requirements Guide
A 2026 guide for contractors on Massachusetts solar permitting and interconnection, including plan sets, PE stamps, utility processes, SMART 3.0, net metering, and the Boston permit process.
Sarah Lozanova
Aug 11
How to Create a Solar Proposal: 2026 Guide for Installers
A 2026 guide for solar installers on creating accurate solar proposals, including quotation format, ROI, incentives, timelines, equipment specs, software, and proposal mistakes to avoid.
Team GreenLancer
Aug 10
Ground Mount Solar Design for Installers: Structures, Racking & Foundations
Ground mount solar design requires resolving structure type, racking, foundation method, and array layout before permitting begins. This guide covers every design decision for installers.
Sarah Lozanova
Aug 5
SDG&E Rule 21 Interconnection: 2026 Guide for Solar Installers
A technical guide to SDG&E Rule 21 interconnection, covering DIIS submissions, Fast Track reviews, common denial reasons, SLD requirements, fees, corrections, and PTO timelines.
Team GreenLancer
Jul 31
SCE PTO Delays: Solar + Storage Interconnection Guide
SCE PTO delays run 8-12 weeks for many installers. Learn the SCE PTO timeline, top rejection reasons, SCE single line diagram requirements, NEM 2.0 deadline risks, and how to speed up SCE PTO.
Team GreenLancer
Jul 31
Solar Racking & Mounting Systems Guide for PV Installers
Learn how to choose the right solar racking systems for residential, commercial, and ground mount projects, including UL 2703 rules, structural loads, costs, installation best practices, and top manufacturers.
Sarah Lozanova
Jul 28
Solar Feasibility Study & Report: A Guide for Solar Installers
This B2B guide explains how to assess solar project feasibility, screen site and grid risks, structure a feasibility report, and prepare projects for design, permitting, and interconnection.
Sarah Lozanova
Jul 28
GreenLancer solar blog
The Renewable Energy Blog
The GreenLancer blog delves into the latest trends and insights in renewable energy, offering information and inspiration for solar energy and electric vehicle charging station (EVCS) contractors. Our commitment is to provide accurate information, supported by meticulous analysis and reliable clean energy sources, including government agencies, renewable energy experts, research institutions, and our in-house expertise, from over a decade in the clean energy industry.
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