1. What is Battery Sizing?

Battery sizing for home backup systems involves calculating the appropriate battery capacity needed to power your home for a specified number of days without grid power. This ensures you have sufficient energy storage for your needs.

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• Daily Home Consumption — Your average daily electricity usage in kilowatt-hours
• Autonomy Days — Number of days you want the battery to power your home

Explanation: The formula multiplies your daily energy needs by the number of days you want backup power to determine total battery capacity required.

3. Importance of Proper Battery Sizing

Details: Correct battery sizing ensures you have enough power during outages without overspending on unnecessary capacity. Undersized batteries won't meet your needs while oversized systems are unnecessarily expensive.

4. Using the Calculator

Tips: Enter your average daily electricity consumption in kWh (check your utility bill) and the number of days you want battery backup. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: How do I find my daily consumption?
A: Divide your monthly kWh usage (from utility bill) by 30, or use a home energy monitor for more precise measurement.

Q2: What's a typical autonomy period?
A: Most homeowners choose 1-3 days, depending on local outage frequency and duration.

Q3: Should I factor in efficiency losses?
A: This calculator provides basic sizing. For precise sizing, add 10-15% to account for battery and inverter inefficiencies.

Q4: What about peak power demands?
A: This calculates energy capacity (kWh). You'll also need to ensure your battery/inverter can handle your home's peak power (kW) demands.

Q5: Can I power my whole home with batteries?
A: Yes, but whole-home backup requires careful load calculation and often substantial battery capacity, especially for high-consumption appliances.