Economics13 min read
Solar PPAs, leases, and EPC purchase compared
A technical comparison of power purchase agreements, leases, and direct purchase for solar projects, covering contract terms, risk allocation, and total cost of ownership.
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Long-form reporting on solar hardware, installation, economics, storage and policy.
Economics13 min read
Self-Consumption and Load Shifting: The Number That Decides Your Solar Economics
Two identical arrays on two identical roofs can differ by half in annual savings. The variable is not the hardware, it is what fraction of the generation is used on site.
Technology13 min read
Thermal imaging of PV arrays: method and fault interpretation
How infrared inspection of PV arrays works in practice, the hotspot patterns that identify specific fault types, and drone-based workflows aligned with IEC TS 62446-3.
Installation10 min read
Roof Mounting Done Right: A Field Guide to Penetrations, Loads and Leaks
Most solar failures are not electrical. They are mechanical, and they start at the moment someone drills a hole in a roof.
Economics12 min read
The Honest Payback Calculation for Rooftop Solar
Sales quotes flatter solar. Discount rates, degradation and self-consumption ratios do not. Here is how to build the number yourself.
Storage10 min read
Sizing a Home Battery Without Guessing
Battery capacity is usually chosen by round numbers and salesmanship. Your own consumption data gives a better answer in about twenty minutes.