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Technical guides, product reviews, code updates, and industry news for installers, EPCs, and project managers
R-410A Phase-Down 2026: What HVAC Contractors Need to Know
The clock is ticking on R-410A. On January 1, 2025, the U.S. EPA's AIM Act rules banned the manufacture and import of most new HVAC equipment charged with R-410A, and by 2026...
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N-Type vs TOPCon vs HJT Solar Panels: Which Technology Is Best in 2026?
Last Updated: August 2026 • Solar Cell Technology Comparison for Installers, EPCs & Commercial Buyers The solar panel...
How Many Solar Panels Do I Need for 10,000 kWh Per Month? - The Complete 2026 Guide
Need 10,000 kWh per month from solar? This complete 2026 guide from Portlandia Electric Supply breaks down the...
Solar + Battery Storage: The Complete 2026 Guide for Homeowners
Last Updated: August 2026 • Home Solar, Battery Backup & Energy Independence Guide Residential solar has changed. A...
ITC Safe Harbor & Commence-Construction: What Solar Buyers Must Lock Before the Residential Credit Sunset
The rules governing federal solar tax credits changed more between July 2025 and July 2026 than in the...
Section 232 Solar Tariffs & Minimum Import Prices: The December 4, 2026 Deadline — What Module, Cell & Polysilicon Bu...
Introduction: A 120-Day Countdown Begins Axitec AU12641 400W MBT Solar Panel - AC-400MH/108V$157.98 View Rec Solar TwinPeak 2S...
How to Size Circuit Breakers: NEC 125% Rule (2026)
Learn how to size circuit breakers correctly with the NEC 125% rule. Step-by-step calculator for safe, compliant breaker...
Solar Module Sourcing in 2026: Regional Costs, Tariff Stacking, and the Domestic Content Math
Where solar modules are made in 2026, what they actually cost by region, how tariffs stack, and when...
Module Prices Hit $0.34/W — So Why Did Your Commercial Quote Go Up?
Solar module prices dropped to $0.34/W in Q1 2026, but commercial system prices rose 4%. The real story...
The Safe Harbor Deadline Passed. Here's What Actually Happened.
The July 4, 2026 safe harbor deadline for full ITC has passed. We break down what developers got...
Section 232 Polysilicon Tariffs Hit Solar: What August 2026 Means for Your Inventory
New Section 232 tariffs on solar-grade polysilicon took effect August 6. We break down what this means for...
Generac Generator Warranty Explained: 5, 7, and 10-Year Extended Coverage
🇺🇸/🇲🇽 Versión en español → Generac sells more residential standby generators than every competitor combined, which means contractors...
Whole Home Generator Sizing Guide 2026: How Many kW Do You Actually Need?
🇺🇸/🇲🇽 Versión en español → The most common question we hear from contractors and homeowners alike is deceptively...
Battery Storage Incentives by State: 2026 Rebate Programs and Tax Credits
✎ PES Supply Editorial Team Trade expertise from 50,000+ SKUs and 169 authorized brands 13 min read Battery...
Solar Market Outlook H2 2026: Panel Prices, Supply Chain, and Demand Trends
The first half of 2026 gave the solar industry a strange combination: record global installations alongside a sharp...
Solar Industry Tariff Updates: What Installers Need to Know in 2026
We field tariff questions from installers every single week, and the honest summary for 2026 is this: the...
Growing Electricity Demand: Why Energy Policy Reform Is More Urgent Than Ever
Every few years the electricity industry produces a number so far outside its own planning models that the...
Mini Split Installation Cost (2026): Equipment, Labor & Electrical Requirements
Mini split installation cost in 2026 — single-zone vs. multi-zone price ranges, what drives labor, and the electrical...
Harnessing the Sun and Soil: How Agrivoltaics is Revolutionizing Sustainable Energy Solutions
There's a moment on every good agrivoltaic project when the two industries stop negotiating and start cooperating. On...
Newest Solar Panels in 2026: Latest Models from Leading U.S. Solar Brands
Newest Solar Panels in 2026: Latest Models from Leading U.S. Solar Brands Efficiency has pushed into the 21-24%...
From the Field: A Master Electrician's Guide to Solar Commissioning
Thirty years of pulling permits teaches you one thing about solar commissioning: the install crew's job ends when...
How Can a Residential ESS Achieve 0W Grid Flow?
"Zero grid flow" — often configured as zero export or zero-import mode — is the holy grail of...
How Automatic Transfer Switches Work
An automatic transfer switch is the brain of a standby power system — the device that notices the...
Solar Panels for 10,000 kWh/Month: 2026 Sizing Guide
Producing 10,000 kWh per month requires 97 to 192 solar panels depending on wattage and location. This complete...
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N-Type vs TOPCon vs HJT Solar Panels: Which Technology Is Best in 2026?
Last Updated: August 2026 • Solar Cell Technology Comparison for Installers, EPCs & Commercial Buyers The solar panel market has moved beyond traditional P-type PERC. In 2026, most high-performance modules...
N-Type vs TOPCon vs HJT Solar Panels: Which Technology Is Best in 2026?
Last Updated: August 2026 • Solar Cell Technology Comparison for Installers, EPCs & Commercial Buyers The solar panel market has moved beyond traditional P-type PERC. In 2026, most high-performance modules...
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How Many Solar Panels Do I Need for 10,000 kWh Per Month? - The Complete 2026 Guide
Need 10,000 kWh per month from solar? This complete 2026 guide from Portlandia Electric Supply breaks down the exact panel count, inverter sizing, battery storage options, and costs for large-scale...
How Many Solar Panels Do I Need for 10,000 kWh Per Month? - The Complete 2026 Guide
Need 10,000 kWh per month from solar? This complete 2026 guide from Portlandia Electric Supply breaks down the exact panel count, inverter sizing, battery storage options, and costs for large-scale...
