The battery capacity of a UPS (Uninterruptible Power Supply) is usually measured in Ampere-hours (Ah). This rating determines how long the UPS can provide power during a blackout. The battery capacity varies greatly across different UPS models, ranging from as small as 6Ah to as large as several hundred Ah.
**Common UPS Battery Capacity Range**
The capacity range for UPS batteries is very broad, designed primarily for different applications and power requirements:
* **Small Office / Home Use UPS:**
* The capacity is typically between **6Ah to 9Ah**.
* For example, the Samsure Lithium Battery UPS model LT500 has a built-in **9Ah** lithium battery, which can provide approximately **2 hours** of backup power for a computer.
* **Medium-sized Business / Server Room UPS:**
* The battery capacity usually ranges from **20Ah to 50Ah**.
* For instance, Samsure offers a 3KVA rack-mount UPS bundle that comes with a **48V 50Ah** Lithium Iron Phosphate (LiFePO4) battery.
* **Large Data Centre & Industrial UPS:**
* The battery capacity can reach **several hundred Ampere-hours**.
**How to Choose the Right UPS Battery Capacity?**
When selecting a UPS battery capacity, you need to consider the following factors:
1. **Load Power (Total Wattage):** The total power consumption of all connected equipment is the foundation. The higher the power demand, the larger the battery capacity you will generally need.
2. **Required Backup Time:** How long do you expect the system to run after a power outage? The higher the load power and the longer the required backup time, the larger the battery capacity needed.
3. **Battery Technology:** Although **Lithium Iron Phosphate (LiFePO4) batteries** have a higher initial cost, they offer advantages such as a longer lifespan, compact size, lighter weight, and faster charging. They often provide a better cost-performance ratio in the long run.