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Technical guides, product reviews, code updates, and industry news for installers, EPCs, and project managers
REC vs Panasonic Solar Panels 2026: Alpha Pure vs EverVolt Head-to-Head
This is the head-to-head I get asked about most, and in 2026 the answer has a twist that didn't exist two years ago: Panasonic announced its exit from the North American residential...
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Bifacial vs Monofacial Solar Panels: 2026 Buyer's Comparison for Installers
Bifacial vs Monofacial Solar Panels: 2026 Buyer's Comparison for Installers Rear-side gain, albedo math, mounting height, price premiums,...
Solar Panel Degradation: What Is the Lifespan and How to Maximize Output
Every solar panel on every roof is slowly dying. That's not a reason to avoid solar — it's...
Best Solar Panels for Off-Grid Systems: A Complete Buyer's Guide
Off-grid panel selection plays by different rules than grid-tie. On a net-metered roof, a panel just feeds the...
How Many Solar Panels Do I Need? System Sizing Guide with Calculator
PES PES Supply Editorial Team Trade expertise from 50,000+ SKUs and 169 authorized brandsReady to build? Shop solar...
Solar Panel Efficiency Explained: Monocrystalline vs. Polycrystalline vs. Bifacial (2026)
Solar panel efficiency is the most quoted and least understood number on the datasheet. Marketing puts it in...
Bifacial Solar Panels Guide: Real-World Gains, Costs & When They're Worth It
Bifacial solar panels deliver 5–30% extra yield — when the site allows it. Real gain factors by surface,...
MC4 Connectors & Solar Wire Gauge Guide: PV Wire Sizing Chart
Solar wire gauge chart for PV strings: NEC 690 156% rule, 10 vs 12 AWG PV wire, MC4...
Solar System Size Calculator: How Many Panels Do You Need? (Chart)
Size a solar system from your power bill: monthly kWh → system kW → panel count chart by...
Solar Panel Kits: The Complete Buyer's Guide for 2026
Compare grid-tied, off-grid, and hybrid solar panel kits, size a kit from your kWh usage, see what belongs...
Solar Panel Technology 2026: TOPCon Dominance, Perovskite Commercialization, and 500W+ Standard
Three numbers define solar panel technology in 2026: 83%, 770W, and 33%. TOPCon now carries roughly 83% of...
The Installer's Diary: Lessons from 1,000+ Residential Solar Installations
The Installer's Diary: Lessons from 1,000+ Residential Solar Installations Roof truths, wire-pull wisdom, customer conversations, and the mistakes...
Solar Panel Price Collapse 2023: Why Module Costs Dropped 50% and What It Means
In November 2023 I was quoting Tier 1 modules at prices that would have gotten me laughed off...
2022 Solar Panel Technology Milestones: Efficiency Records and New Cell Architectures
Looking back from 2026, the solar industry's 2022 calendar year reads like a pivot point written in bold....
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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...
