Dahua NVR5208-EI2 – 8CH WizSense AI Network Video Recorder (2 HDD, 384 Mbps, EI2 Series)
Unless selecting a vari-focal camera (with an adjustable lens) It is important to select the correct camera lens option for where the camera is to be positioned. A smaller lens will give you a wider angle but will be "zoomed out more", while a bigger lens will narrow the angle down and "zoom in more". See below to give you some idea on angles of Megapixel HD Cameras:
| Lens in mm | Approx Viewing Angle (degrees) | Ideal Distance (metres) | Typical usage/notes |
|---|---|---|---|
| 2.8 | 106 | <6 | For seeing as much of the immediate area as possible such as above a doorway/low down/garage soffits (edges can appear slightly warped/distorted) - clearly "zoomed out" |
| 3.6/4 | 83-90 | <12 | A great general purpose option giving great coverage still in the corner of a room or higher up on second floor soffits with less distortion - more of a natural "zoom" |
| 6 | 56 | 6-20 | Narrows down the angle and zooms in to look past the immediate area a little to gain more detail - down a driveway for example from higher up |
| 12 | 24 | 20+ | Zooms in significantly more to look at a gate, entrance or adjascent building |
| 16 | 19 | 24+ | As above but more so |
The amount of hard drive space you require is dictated by how many cameras, as well as their resolution and frame rate settings. Finally you can often make your storage space last a lot longer by enabling motion detected recording rather than continuous, especially if there are long periods of no activity.
|
Resolution (Megapixels) |
Days of storage provided by 1TB per camera (continuous - full 25 frames per second) |
Days of storage provided by 1TB per 4 cameras (continuous - full 25 frames per second) |
Days of storage provided by 1TB per 4 cameras (50% motion- 15 frames per second) |
|---|---|---|---|
| 1 | 44 | 11 | 36 |
| 2 | 22 | 5 | 18 |
| 3 | 17 | 4 | 14 |
| 4 | 11 | 3 | 9 |
| 5 | 9 | 2 | 8 |
| 6 | 8 | 2 | 6 |
| 8 (4K) | 5 | 1 | 4 |
| 12 | 4 | 0.5 | 3 |
As a rule of thumb we recommend a minimum of 2 Terabytes per 4 x 2-4MP HD cameras, as this should give you 2 weeks to a month with a few adjustments on motion detected recording. You may only require the full 25 frames per second on certain cameras if things are fast moving.
(All of our hard drives come fitted and are CCTV specific from one of the major brands)
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Dahua NVR5208-EI2 – 8CH WizSense AI Network Video Recorder (2 HDD, 384 Mbps, EI2 Series)
The Dahua NVR5208-EI2 belongs to the WizSense 5-EI2 Series, which is an enhanced generation of Dahua’s AI-powered recording platforms. It is designed for professional IP surveillance systems requiring high decoding performance, advanced AI analytics, and improved system efficiency compared to standard EI models. It supports up to 8 IP camera channels, while delivering enterprise-grade AI processing capabilities suitable for intelligent video analysis rather than simple channel expansion. The recorder supports up to 384 Mbps incoming, recording, and outgoing bandwidth, enabling smooth handling of multiple high-resolution video streams, including cameras up to 32MP. A key improvement in the EI2 platform is optimised AI performance and system resource handling, allowing more stable operation when multiple intelligent analytics are active simultaneously.
KEY FEATURES
- ONVIF compatibility
- 2 × SATA HDD bays (up to 40TB total)
- HDMI output up to 8K resolution
- Smart H.265+ compression
- AI camera support (ANPR, heat map, people counting, PPE detection)
- Video metadata analytics (human/vehicle/non-motor vehicle)
- SMD Plus intelligent motion detection
- Perimeter protection (intrusion & tripwire)
- Face detection and recognition (20 databases / 20,000 faces)
- AcuPick smart video search
- Supports IP cameras up to 32MP
- Up to 384 Mbps bandwidth
- WizSense 5-EI2 AI platform
- 8-channel IP video recording
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