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Calculator
Browse 3 in-depth Calculator guides from Solar Home Planner. Our editorial team researches and writes each one to give you clear, practical answers, current as of August 2026. The newest are shown first.
Solar Planning Tools
PVWatts Calculator: Use 9.6 kW Systems to Estimate Solar Output
Most solar calculators are glorified guessing games dressed up with satellite imagery. PVWatts, built and …
Solar Planning Tools
Solar Panel Angle Calculator: Find Your Optimal Tilt by Zip Code
Most homeowners installing solar panels lose between 10% and 25% of potential energy production simply because …
Off Grid & Backup Power
Calculate Your Ideal Solar Battery Size in Minutes
Most solar battery sizing guides will tell you to add up your daily kWh usage, multiply by your backup days, …