1. What is UPS Battery Capacity?

The battery capacity (measured in ampere-hours, Ah) determines how long your UPS can power connected devices during an outage. It's calculated based on the total power consumption of appliances and desired backup time.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \text{Home Appliances} \) — Total wattage of connected devices
• \( \text{Desired Time} \) — Required backup duration in hours
• \( \text{UPS Voltage} \) — Voltage of your UPS system (typically 12V, 24V, or 48V)

Explanation: The formula converts watt-hours to ampere-hours by dividing by system voltage.

3. Importance of Proper Battery Sizing

Details: Correct battery sizing ensures your UPS can provide adequate backup time without over-sizing (which increases cost) or under-sizing (which reduces protection).

4. Using the Calculator

Tips: Sum the wattage of all appliances needing backup. Common UPS voltages are 12V (small systems), 24V (medium), or 48V (large). Always add 20-30% safety margin to calculated capacity.

5. Frequently Asked Questions (FAQ)

Q1: How do I find my appliances' wattage?
A: Check appliance labels or manuals. Alternatively, use a wattmeter to measure actual consumption.

Q2: What's typical backup time for home UPS?
A: Most home systems aim for 1-4 hours depending on critical loads like lights, routers, and refrigerators.

Q3: Should I use inverter or UPS battery?
A: UPS batteries are designed for frequent discharges. Inverter batteries may have different characteristics.

Q4: How does battery type affect capacity?
A: Lead-acid batteries should only be discharged to 50% capacity for longevity, while lithium can often discharge deeper.

Q5: Can I connect multiple batteries?
A: Yes, batteries can be connected in series (increases voltage) or parallel (increases capacity).