New to Solar
Build a practical foundation without jargon: system types, panels, and the terms that matter.
Start with the basics →Independent solar planning
Understand solar before you buy.
Independent guides, practical calculators, and system design resources for homeowners and solar buyers.
Transparent assumptions · Source-led guides · No installer referrals
Planning exampleLive estimate
Daily electricity use24.6 kWh
Peak sun hours4.8 h/day
Estimated system size6.4 kW
Suggested panels15 × 430 W
A clearer starting point
Where are you in your solar decision?
Choose the path that matches the next real decision you need to make.
Planning a System
Turn your energy use, site, and component choices into a defensible first estimate.
Start planning →Comparing Quotes
Check assumptions, components, warranties, and scope before you sign.
Compare with confidence →Decision tools
Run the numbers with visible assumptions.
Each calculator shows more than an answer—it makes the inputs that change it easy to understand.
01 / SYSTEM
Solar System Size Calculator
Energy use + sun hours + system losses → array kW and panel count
Example output6.4 kW15 × 430 W →
02 / ECONOMICS
Solar ROI / Payback Calculator
Project cost + electricity rate + production → payback and 25-year value
Example output7.8 yr25 yr outlook →
03 / PANELSPanel Output Estimator
430 W × 4.8 h → 1.75 kWh/day
04 / STORAGEBattery Size Calculator
8 h backup → 10.8 kWh bank
Selected guidance
From the first question to a defensible system decision.
BUYING GUIDE
SYSTEM DESIGNHow to choose a solar system
A structured path from energy use and site constraints to proposals, components, and warranties.
Read the guide →Solar system sizing
Connect demand, losses, and design margin.
PRICING & ROIUnderstand solar payback
See which assumptions drive project economics.
How we work
Independent information, clear limits.
Focus Solar explains technical and financial trade-offs in plain language. We show assumptions, link sources, and distinguish early planning from professional detailed design.
- 01
- Show assumptions
- 02
- Link source material
- 03
- Flag regional limits
Quick answers
Common questions
Is Focus Solar affiliated with installers?
No. The site provides independent planning information and does not sell installer referrals.
Are the calculators a final system design?
No. They provide an early estimate. Site assessment, electrical design, and permitting require qualified local professionals.
Why can prices and incentives differ?
Electricity rates, taxes, incentives, and installation costs vary by place and time. Verify local conditions before deciding.
FOCUS SOLAR / CALCULATORS
Estimate system size →Start with your own numbers.
A first system estimate takes less than two minutes.