Power is an important, yet unfortunately overlooked, element of video surveillance systems. While power is relatively inexpensive, mistakes in designing, supplying and backing up power can cause significant reliability problems.
Many of the most common service problems can be traced back to issues (or flat out errors) with specifying and planning power for video surveillance.
When power is commonly discussed in the industry, the focus is on Power over Ethernet (as if PoE is the one key issue). Though PoE is important, many times it cannot be used and, even if it used, it does not eliminate the other issues involved in powering surveillance systems.
In this report, we examine power options for video surveillance and factors impacting their selection and use. We recommend users review 6 main issues in designing power for video surveillance:
- Determining Power Budget (Power Needed vs Provided)
- Appreciating Specific Application Power Requirements
- Deciding on Form Factor for Power Supplies
- Deciding on AC vs DC (where applicable)
- Specifying Backup Power
- Selecting Overcurrent Protection