How Many Solar Panels Do You Need To Power A Home?

One of the most common questions from homeowners considering solar is how many panels they actually need. The answer depends on several factors specific to your home. ## Step 1 — Calculate Your Energy Consumption Check your electricity bill for your annual kilowatt-hour consumption. The average German household uses around 3500 kilowatt-hours per year. Divide by 365 for your daily average of roughly 9.6 kilowatt-hours per day. ## Step 2 — Understand Solar Panel Output A modern 400W solar panel produces approximately 1 to 1.4 kilowatt-hours per day in Germany depending on location and season. Germany receives between 950 and 1250 peak sun hours annually. ## Step 3 — Calculate How Many Panels You Need Formula: Annual consumption divided by annual output per panel. Example: 3500 kilowatt-hours divided by 380 kilowatt-hours per panel per year equals approximately 9-10 panels. For a typical German home expect to need between 8 and 15 solar panels depending on your consumption and roof orientation. ## South Facing Roof vs East-West A south-facing roof at 30-35 degree angle produces maximum output. East-west facing roofs produce around 80% of the output of south-facing but spread generation more evenly across the day. ## Do You Need Battery Storage? Without battery storage your solar panels only power your home during daylight hours. With battery storage you can use solar energy at night significantly increasing your self-consumption rate. ## Final Calculation Guide Low consumption home under 3000 kwh: 6-8 panels Average German home 3500 kwh: 8-12 panels Large home or EV owner over 6000 kwh: 15-20 panels