Solar Power Formula:
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Definition: This calculator estimates the daily energy production of a solar panel system based on panel power, sunlight hours, and performance ratio.
Purpose: It helps homeowners and solar installers estimate potential solar energy generation for a specific location.
The calculator uses the formula:
Where:
Explanation: The panel power is multiplied by sunlight hours and performance ratio to estimate daily energy output.
Details: Accurate solar power estimation helps determine system sizing, return on investment, and energy savings potential.
Tips: Enter panel power in kW, average daily sunlight hours (default 4.5), and performance ratio (default 0.75). All values must be > 0.
Q1: How do I find average sunlight hours for my address?
A: Use solar maps or local meteorological data. Many solar calculators provide location-based estimates.
Q2: What's a typical performance ratio?
A: Most systems have PR between 0.70-0.80, accounting for losses from temperature, wiring, dirt, etc.
Q3: Should I use peak or nominal panel power?
A: Use the panel's rated power under standard test conditions (STC), typically listed in kW.
Q4: Does this calculate daily or annual production?
A: This calculates daily production. Multiply by 365 for annual estimate.
Q5: How accurate is this calculator?
A: It provides estimates. For precise calculations, consult a solar professional with detailed site data.