Grid-Tied Solar System Sizing Calculator
Determine the perfect solar panel system size for your home based on your energy needs and location
📊 Input Parameters
Average household uses 20-40 kWh/day
Check solar maps for your location (typically 3-6 hours)
Typical losses: 10-20% (wiring, inverters, etc.)
Standard panels: 300-450W
Standard panels: 15-22%
📈 Results
Required System Capacity
Total DC power output needed
Number of Solar Panels
Based on your selected panel wattage
Estimated Panel Area
Approximate roof space required
Annual Energy Production
Estimated based on your inputs
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Frequently Asked Questions
A grid-tied solar system is connected to the public electricity grid and doesn’t require battery storage. It allows you to use solar power when available and draw from the grid when needed, often with net metering to credit you for excess energy sent back to the grid.
This calculator provides estimates based on standard industry calculations. Actual system requirements may vary based on specific site conditions, shading, panel orientation, and other factors. We recommend consulting with a solar professional for a precise assessment.
Panel efficiency is affected by temperature (panels work better in cooler conditions), shading, dirt/dust accumulation, panel orientation and tilt angle, and the quality of the solar cells themselves. Most residential panels have efficiencies between 15-22%.
Peak sun hours vary by location. You can find this information through solar maps from organizations like NREL, or use online tools that provide solar data for your specific zip code. As a general guide: Northern states get 3-4 peak sun hours, Southern states get 5-6.