Solar PV System Size Calculator

Solar PV System Size Formula:

\[ Size = \frac{E}{I \times \eta} \]

System Size:

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What Is Solar PV System Size Calculation?

Solar PV system size calculation determines the required capacity (in kW) of a solar photovoltaic system to meet specific energy needs, considering local solar conditions and system efficiency.

2. How Does The Calculator Work?

The calculator uses the formula:

\[ Size = \frac{E}{I \times \eta} \]

Where:

\( Size \) — System size in kilowatts (kW)
\( E \) — Daily energy requirement in kilowatt-hours (kWh)
\( I \) — Average daily solar insolation in hours
\( \eta \) — System efficiency as a percentage (converted to decimal)

Explanation: This formula calculates the necessary system capacity by dividing the energy requirement by the product of solar hours and system efficiency.

3. Importance Of Proper System Sizing

Details: Proper solar PV system sizing is crucial for maximizing energy production, ensuring system reliability, optimizing return on investment, and meeting energy needs without oversizing or undersizing the system.

4. Using The Calculator

Tips: Enter your daily energy consumption in kWh, average daily solar hours for your location, and the expected system efficiency percentage. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical efficiency value for solar PV systems?
A: Most grid-tied solar systems have efficiencies between 15-22%, considering inverter losses, temperature effects, and other factors.

Q2: How do I determine solar hours for my location?
A: Solar hours (insolation) data is available from NASA's SSE database, local meteorological services, or solar mapping tools specific to your region.

Q3: Should I size my system for worst-case or average conditions?
A: It's recommended to size for average conditions but include a safety margin (typically 10-20%) to account for seasonal variations and system degradation.

Q4: Does this calculation account for battery storage?
A: No, this formula calculates the solar array size needed to produce a certain amount of energy. Battery storage calculations require additional considerations.

Q5: How often should I recalculate my system size needs?
A: Re-evaluate your system size if your energy consumption changes significantly, or if you're considering expanding your solar installation.