How to Size a Solar System (Step-by-Step)
Solar Powered Project
1 min read
Step-by-step solar system sizing guide with clear formulas, load planning, and links to output and battery calculators.
Key takeaways
- Start with daily watt-hours used.
- Panel size depends on peak sun hours.
- Battery size depends on backup time.
Step 1: Calculate daily load
Add up appliance wattage and daily hours of use. Multiply watts by hours to get watt-hours (Wh).
Example: 100W x 5 hours = 500Wh
Step 2: Size solar panels
Divide daily Wh by average peak sun hours to estimate needed panel watts.
Solar panel output calculator →
Step 3: Size batteries
Choose a battery bank to cover the number of hours or days you want in reserve.
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