RK Contributing Solar Engineer
PhD Electrical Engineering (Photovoltaics), IEEE Senior Member, former NREL researcher
Dr. Kumar has published 34 peer-reviewed papers on photovoltaic cell efficiency, which means he can tell you exactly why that '25% efficient' panel in the brochure will deliver 18% in your actual climate conditions on your actual roof angle. He spent eight years at NREL (National Renewable Energy Laboratory) before moving to academia, where he runs a solar testing lab that manufacturers both court and fear. His bifacial panel comparison study — the one that proved three major brands were overstating rear-side energy gains by 40% — got him temporarily uninvited from two industry conferences and permanently invited to three others. He provides the technical depth behind every panel performance analysis on SolarScout.
11 years of experience in solar energy.
Compare EcoFlow Delta 2 Max vs Bluetti AC200P on solar input, charge speed, and expandability. Find out which portable power station is worth buying in 2026.
Compare EcoFlow Delta Pro vs Jackery Explorer 1000 Pro on capacity, LFP vs NMC chemistry, cycle life, and solar charging before you buy in 2026.
Compare EcoFlow and Bluetti solar power systems: real specs, pricing, and a clear winner for home backup and portable solar charging.
Compare Renogy and Rich Solar 200W panels on efficiency, cell tech, weight, and price — expert pick for camping, RV, and off-grid builds.
Compare whole-house fan vs central AC costs in 2026: real watt-by-watt analysis, climate suitability filters, and payback math for your specific climate.
Compare solar lease vs buy vs PPA for 2026 — real ROI math, escalation clause breakdowns, and the post-ITC payback reality for each financing path.
Dr. Raj Kumar tests the Tesla Powerwall 3's integrated inverter. Real efficiency numbers, ROI math, known issues, and who should buy it in 2026.
Snow load scores, temperature coefficient data, and winter output tested — these panels produce up to 25% more in cold weather than budget alternatives.
Solar beats the grid in 35+ states with 300–500% lifetime ROI and a 5–8 year payback. Here's the honest cost analysis for your state before you decide.