How Long Do Solar Panels Last? The Real Numbers
Panels don't die at 25 years. Real degradation rates, what actually fails, when the inverter goes, and why only 10% get recycled.
Category: Solar FAQs
Straight answers to the questions people actually ask about solar lighting.
Factors Affecting Solar Panel Efficiency, Ranked by Cost
Temperature, shade, dirt, angle and age ranked by the percent each costs, with a source per line, and…
How To Connect Two Solar Panels To One Battery
Series or parallel, PWM or MPPT, cold-weather Voc, fusing and wire gauge: the real wiring math for putting…
Do Solar Lights Need Direct Sunlight to Charge? The Numbers
Yes, mostly. Measured irradiance and charge current for full sun, cloud, open shade, dappled shade, a north wall…
Can I Use a Higher mAh Battery in Solar Lights?
Yes - but it only buys you anything if your light is still lit at dawn. The pre-dawn…
How to Clean Solar Panels on a Roof (and When Not To)
Rain resets a tilted array at 0.1 in of rain. One wash a year adds ~0.81% to output,…
Advantages and Disadvantages of Solar Energy (2026 Data)
The advantages and disadvantages of solar energy in real numbers: $3.60/W installed, 6-22 year payback by state, 41…
Polycrystalline vs Monocrystalline Solar Panels in 2026
Poly was 70% of world panel production in 2016. In 2025 it was zero. What actually separates poly…
How to Clean Solar Lights (and When Cleaning Won’t Help)
Clean solar lights safely in 10 minutes — plus the 30-second test that tells you whether dirt is…
How Long Do Solar Lights Last? The Part-by-Part Answer
Battery: 1-4 years. LED: 12-17. We break solar light lifespan down by component using manufacturer data, and what…
Why Do Solar Lights Have an On/Off Switch? The Real Answer
The switch isn't pointless. It protects the battery in storage and shipping, and whether your light still charges…
How Are Solar Panels Installed On A Roof?
Over the past several years, using solar energy to power a home has grown in popularity and affordability.…
Do Solar Panels Attract Lightning? | Solar FAQs
Solar panels have become increasingly popular in the last decade as a way to reduce electricity bills and…