1. What is an Off-Grid Solar System Size Calculator?

Definition: This calculator estimates the required solar system size (in kW) based on your daily energy consumption and local peak sun hours.

Purpose: It helps homeowners and professionals determine the appropriate solar array size for off-grid power systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• System Size — Required solar array capacity in kilowatts (kW)
• Daily Load — Your total daily energy consumption in kilowatt-hours (kWh)
• Peak Hours — Average daily peak sunlight hours at your location

Explanation: The daily energy requirement is divided by the available peak sun hours to determine the solar array size needed to meet your energy needs.

3. Importance of Proper System Sizing

Details: Correct system sizing ensures reliable power supply, maximizes system efficiency, and prevents over- or under-investment in solar equipment.

4. Using the Calculator

Tips:

• Enter your total daily energy consumption (kWh)
• Input your local peak sun hours (default 4.5 hours)
• All values must be greater than 0

5. Frequently Asked Questions (FAQ)

Q1: What are peak sun hours?
A: Peak sun hours represent the equivalent number of hours per day when solar irradiance averages 1,000 W/m². This varies by location and season.

Q2: How do I find my daily energy consumption?
A: Check your electricity bills or use an energy monitor to measure appliance usage over 24 hours.

Q3: Does this include battery storage?
A: No, this calculates only the solar array size. Battery storage should be sized separately based on your autonomy requirements.

Q4: Should I add a safety margin?
A: Yes, consider adding 20-30% to account for system losses, aging, and less-than-ideal conditions.

Q5: What's a typical peak sun hours value?
A: Most locations range from 3-6 peak sun hours per day. Desert areas may have 6-7, while northern latitudes may have 2-4.