How to Choose the Right Power Distribution Unit
Power Distribution Units (PDUs) are essential components of data centers, server rooms, and network closets. They distribute electrical power to servers, storage devices, networking equipment, and other data-center-related appliances. But with a myriad of PDUs available in the market, choosing the right one can be overwhelming. This blog aims to simplify the process by highlighting the key considerations when choosing the right PDU for your needs.
### **1. Understand the Types of PDUs**
Before delving into specifications, it's crucial to understand the basic types of PDUs:
* **Basic PDUs** - These simply distribute power, without any monitoring or control functions.
* **Metered PDUs** - They distribute power and have a built-in meter that displays power data, like current draw.
* **Monitored PDUs** - Apart from distributing power, these units offer remote monitoring of load levels.
* **Switched PDUs** - Allow for individual outlet control, letting you remotely turn outlets on or off.
* **Hot-Swap PDUs** - These units allow for UPS (uninterruptible power supply) battery replacement without interrupting power to connected equipment.
* **Automatic Transfer Switch (ATS) PDUs** - They can source power from two different lines, switching to the secondary line if the primary fails.
### **2. Determine the Power Requirements**
Before buying a PDU, you must ascertain the power needs of your equipment. Consider:
* **Voltage** - Common voltages include 120V, 208V, and 240V.
* **Amperage** - Calculate the total current draw of your devices to ensure the PDU can handle it.
* **Phase** - Depending on your geographical location and specific needs, you might need single-phase or three-phase power.
### **3. Outlet Type and Density**
Look at the types of plugs your equipment uses and ensure that the PDU you choose has compatible outlets. Also, consider the outlet density (the number of outlets on the PDU). Ensure there are enough outlets for your equipment and some room for expansion.
### **4. Form Factor**
PDUs come in various shapes and sizes:
* **Horizontal (Rackmount)** - Fits into a standard 19-inch rack.
* **Vertical (Zero U)** - Mounted at the back or sides of a rack.
* **Standalone** - For areas without racks or cabinets.
### **5. Monitoring and Management Capabilities**
For those opting for monitored or switched PDUs, the PDU's remote management capabilities are crucial. This allows you to monitor power usage, environmental conditions, and even control individual outlets from anywhere. This capability is valuable for power usage optimization, preventive maintenance, and addressing issues remotely.
### **6. Environmental Monitoring**
Some PDUs come equipped with environmental sensors that can monitor parameters like temperature and humidity in a server room. This feature is crucial in ensuring the longevity of equipment and preventing unexpected breakdowns.
### **7. Redundancy and Failover**
If your operations can't afford any downtime, consider PDUs with ATS or opt for multiple PDUs to provide redundancy. In case one unit fails or one power source experiences problems, your equipment can continue to function.
### **8. Compliance and Safety**
Ensure the PDU you select complies with relevant industry standards and safety regulations. Look for certifications such as UL or CE, which indicate that the product has been tested for safety and reliability.
### **Conclusion**
Selecting the right PDU goes beyond just power distribution; it’s about ensuring uptime, optimizing power usage, and safeguarding your equipment. By keeping these considerations in mind, you can ensure that your choice aligns with your infrastructure's current requirements and future growth.
