1. What is Inverter Battery Backup?

The inverter battery backup time indicates how long your solar system can power your loads when fully charged. It's a crucial metric for solar system design and energy planning.

2. How Does the Calculator Work?

The calculator uses the backup time formula:

Where:

• Solar Inverter Battery Ah — Battery capacity in amp-hours
• V — System voltage (typically 12V, 24V, or 48V)
• Solar Load W — Total power consumption of connected loads in watts

Explanation: The formula calculates how many hours a fully charged battery can sustain your electrical loads before needing recharge.

3. Importance of Backup Time Calculation

Details: Knowing your backup time helps in proper system sizing, ensuring you have enough power during outages or low solar production periods.

4. Using the Calculator

Tips: Enter battery capacity in Ah, system voltage in volts, and total load in watts. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this calculation?
A: This provides theoretical maximum. Real-world results may vary due to battery age, temperature, inverter efficiency, and discharge rates.

Q2: What's a good backup time?
A: Typically 4-8 hours for home systems, but depends on your needs. Critical systems may require longer backup.

Q3: Does this account for battery depth of discharge?
A: No. For lead-acid batteries, multiply result by 0.5 (50% DoD). Lithium batteries can use 80-90% of capacity.

Q4: How can I increase my backup time?
A: Increase battery capacity (Ah), reduce loads, or add more batteries in parallel.

Q5: Should I include inverter efficiency?
A: For more accuracy, divide result by inverter efficiency (typically 0.85-0.95 for good inverters).