Dahua NVR4208-EI – 8CH WizSense AI Network Video Recorder (2 HDD, 256 Mbps)
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 NVR4208-EI – 8CH WizSense AI Network Video Recorder (2 HDD, 256 Mbps)
The Dahua NVR4208-EI is part of Dahua’s WizSense EI Series, offering powerful AI capabilities, high-bandwidth performance, and flexible storage options for professional IP surveillance systems. Designed for commercial, industrial, and enterprise security applications, it combines intelligent analytics with reliable recording performance. Supporting up to 8 IP camera channels, the recorder accommodates cameras with resolutions up to 16MP and provides a maximum incoming, recording, and outgoing bandwidth of 256 Mbps. This high throughput allows smooth operation with multiple high-resolution cameras whilst maintaining excellent live viewing and playback performance. The recorder integrates Dahua WizSense AI technology, providing intelligent functions including face detection, face recognition, perimeter protection, and SMD Plus. Face recognition supports up to 10 face databases with a total capacity of 20,000 face images, enabling efficient identification, comparison, and forensic video searches.
KEY FEATURES
- 8-channel IP video recorder
- Supports IP cameras up to 16MP
- Up to 256 Mbps incoming bandwidth
- WizSense AI analytics platform
- Face detection and face recognition
- Perimeter protection analytics
- SMD Plus intelligent motion detection
- Up to 10 face databases and 20,000 face images
- Human and vehicle classification support
- ANPR, people counting and heat map support
- Smart H.265+ video compression
- HDMI and VGA video outputs
- Up to 4K Ultra HD display resolution
- Dual SATA HDD bays
- Up to 40 TB total storage capacity
- ONVIF Profile S, G and T compatibility
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