Solar fundamentals
Production, roof fit, costs, and the questions to ask before buying.
Factor C Resources
Make energy decisions with better context.
Clear, practical guidance on residential solar, battery storage, and system design. Learn the concepts, understand the tradeoffs, and arrive at every installer conversation prepared.
Analyze My HomeBattery resilience
Backup loads, outage goals, usable energy, and power requirements.
System design
Panel layouts, shading, equipment choices, and proposal comparisons.
Latest thinking
Guides for planning with confidence.
The Clear Guide to Home Solar and Battery Systems
How many solar panels do you need? What size battery? What does it cost? Clear answers for homeowners, plus free tools to model your own home.
Turn knowledge into a plan