1. What is the Solar Battery Backup Calculator?

The Solar Battery Backup Calculator helps determine the required battery capacity (in ampere-hours) for a home solar power system based on your daily energy consumption, system voltage, and efficiency factors.

2. How Does the Calculator Work?

The calculator uses the following equation:

Where:

• \( Home\ Daily\ Wh \) — Your home's daily energy consumption in watt-hours
• \( Solar\ Voltage \) — Voltage of your solar battery system (typically 12V, 24V, or 48V)
• \( Efficiency \) — System efficiency factor (typically 0.7-0.9)

Explanation: The equation converts your daily energy needs into battery capacity by accounting for system voltage and efficiency losses.

3. Importance of Backup Capacity Calculation

Details: Properly sizing your battery bank ensures you have enough stored energy to power your home during periods without sunlight or grid power.

4. Using the Calculator

Tips: Enter your home's daily energy consumption in watt-hours, your system voltage, and an efficiency factor (default is 0.85). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: How do I find my home's daily energy consumption?
A: Check your electricity bill for kWh usage and multiply by 1000 to get watt-hours, then divide by 30 for daily average.

Q2: What voltage should I use?
A: Common solar system voltages are 12V (small systems), 24V (medium), or 48V (larger systems). Match your battery bank configuration.

Q3: What efficiency factor should I use?
A: Typical efficiency ranges from 0.7 (poor) to 0.9 (excellent). 0.85 is a good default for most systems accounting for inverter and battery losses.

Q4: Should I add a safety margin?
A: Yes, it's recommended to add 20-30% to the calculated capacity to account for battery aging and unexpected loads.

Q5: How does this relate to days of autonomy?
A: Multiply the result by your desired days of backup (e.g., 2x for two days of power without sun) to size your complete battery bank.