1. What is the Battery Size Calculation?

The battery size calculation determines the required battery capacity (in ampere-hours) to power a 1000W inverter for a specified backup time at a given system voltage. This is crucial for designing reliable power backup systems.

2. How Does the Calculator Work?

The calculator uses the following formula:

Where:

• 1000 — Power rating of the inverter (watts)
• Backup h — Desired backup time (hours)
• V — System voltage (volts)

Explanation: The formula converts power (watts) to current (amps) based on system voltage, then multiplies by the desired runtime to get capacity in ampere-hours.

3. Importance of Proper Battery Sizing

Details: Correct battery sizing ensures your inverter system can provide power for the required duration without over-discharging batteries, which extends battery life and ensures reliable operation.

4. Using the Calculator

Tips: Enter desired backup time in hours and system voltage in volts. Typical system voltages are 12V, 24V, or 48V for most inverter systems.

5. Frequently Asked Questions (FAQ)

Q1: Does this account for battery efficiency?
A: No, this is a theoretical calculation. Real-world systems should account for 80-90% battery efficiency and add 20-25% extra capacity.

Q2: What if my inverter isn't exactly 1000W?
A: For different wattages, adjust the formula: (Inverter Watts × Backup h) / Voltage.

Q3: How does battery type affect this calculation?
A: Lead-acid batteries should not be discharged below 50% capacity, so double the calculated Ah. Lithium batteries can typically discharge deeper (80-90%).

Q4: What about multiple batteries?
A: Divide the total required Ah by individual battery capacity to determine how many batteries you need in parallel.

Q5: Does temperature affect battery capacity?
A: Yes, cold temperatures reduce battery capacity. In cold climates, you may need 20-30% more capacity.