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Technical guides, product reviews, code updates, and industry news for installers, EPCs, and project managers

Best Solar Panels for Cloudy Climates: What Actually Matters
Featured ·bifacial

Best Solar Panels for Cloudy Climates: What Actually Matters

Cloud cover doesn't kill solar economics — but panel choice matters more. Efficiency, low-light behavior, and temperature coefficient separate good picks from great ones.

Oct 02, 2026 · 3 min read Read the featured article →
Best Solar Panels for Cloudy Climates: What Actually Matters
Solar

Best Solar Panels for Cloudy Climates: What Actually Matters

Cloud cover doesn't kill solar economics — but panel choice matters more. Efficiency, low-light behavior, and temperature coefficient...

Oct 02, 20263 min read
All-black residential solar panels on a shingle rooftop at low afternoon sun
Solar

Canadian Solar 445W vs 435W: TOPHiKu6 Model Guide | PES

PES PES Supply Editorial Team Trade expertise from 50,000+ SKUs and 169 authorized brands Canadian Solar 445W vs...

Sep 22, 20267 min read
Full residential rooftop solar array with inverter and meter on exterior wall
Solar

Solar System Sizing Calculator: From kWh Usage to Array Size (2026) | PES

Updated September 2026 — refreshed against the live PES catalog; product pricing verified 2026-09-26. 2026 product line update...

Sep 16, 20269 min read
High-efficiency monocrystalline solar panels on a residential rooftop at golden hour
Solar

Most Efficient Solar Panels of 2026: A Buyer's Guide for Installers & Homeowners

Updated September 2026 — refreshed against the live PES catalog; product pricing verified 2026-09-26. I've been speccing modules...

Aug 23, 202616 min read

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Electrical & Code

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REC Alpha Series solar panels on a modern rooftop at golden hour — HJT heterojunction technology debut at Intersolar Europe 2019
Electrical & Code

REC Alpha Debuts at Intersolar: HJT Cells Hit Mass Production

REC Alpha Debuts at Intersolar: HJT Cells Hit Mass Production By Portlandia Electric Supply Technical Editorial Team ·...

May 22, 201920 min read

New hvac coverage is in the works — browse all hvac articles →

New industry desk coverage is in the works — browse all industry desk articles →

The Latest

All-black residential solar panels on a shingle rooftop at low afternoon sun
445w

Canadian Solar 445W vs 435W: TOPHiKu6 Model Guide | PES

PES PES Supply Editorial Team Trade expertise from 50,000+ SKUs and 169 authorized brands Canadian Solar 445W vs...

Sep 22, 20267 min read
Full residential rooftop solar array with inverter and meter on exterior wall
inverters

Solar System Sizing Calculator: From kWh Usage to Array Size (2026) | PES

Updated September 2026 — refreshed against the live PES catalog; product pricing verified 2026-09-26. 2026 product line update...

Sep 16, 20269 min read
High-efficiency monocrystalline solar panels on a residential rooftop at golden hour
2026

Most Efficient Solar Panels of 2026: A Buyer's Guide for Installers & Homeowners

Updated September 2026 — refreshed against the live PES catalog; product pricing verified 2026-09-26. I've been speccing modules...

Aug 23, 202616 min read
REC Alpha Series solar panels on a modern rooftop at golden hour — HJT heterojunction technology debut at Intersolar Europe 2019
2019

REC Alpha Debuts at Intersolar: HJT Cells Hit Mass Production

REC Alpha Debuts at Intersolar: HJT Cells Hit Mass Production By Portlandia Electric Supply Technical Editorial Team ·...

May 22, 201920 min read
Premium black-framed residential solar panels on a modern home roof at golden hour
2019

SunPower X-Series vs LG NeON R: Flagship Panels of 2019

A detailed head-to-head comparison of the two flagship residential solar panels of 2019: SunPower X-Series and LG NeON...

Mar 06, 201918 min read