1. What is a Solar Generator Sizing Calculator?

Definition: This calculator determines the required capacity of a solar generator based on your electrical load, desired runtime, and system efficiency.

Purpose: It helps solar energy users and installers properly size battery banks for off-grid or backup power systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• Capacity — Required battery capacity (Watt-hours)
• Load — Total power consumption of connected devices (Watts)
• Runtime — Desired operating time (hours)
• Efficiency — System efficiency factor (typically 0.7-0.9)

Explanation: The load multiplied by runtime gives the basic energy requirement, which is then increased to account for system inefficiencies.

3. Importance of Proper Sizing

Details: Correct sizing ensures reliable power supply, prevents battery damage from over-discharge, and optimizes system cost.

4. Using the Calculator

Tips: Enter your total load in Watts, desired runtime in hours, and system efficiency (default 0.85). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical efficiency value?
A: Most systems are 70-90% efficient (0.7-0.9). The default 0.85 accounts for battery and inverter losses.

Q2: Should I include all my appliances?
A: Yes, sum the wattage of all devices that will run simultaneously during the desired runtime.

Q3: How do I find my appliance wattage?
A: Check manufacturer labels or use a wattage meter. Some appliances list amps - multiply by voltage to get watts.

Q4: Does this include solar panel sizing?
A: No, this calculates battery capacity only. Solar panel sizing depends on location, sunlight hours, and recharge time.

Q5: Should I add a safety margin?
A: Yes, consider adding 20-30% to the calculated capacity for battery longevity and unexpected loads.