Dahua NVR4104HS-P-EI – 4CH WizSense AI PoE Network Video Recorder (1 HDD, 80 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 NVR4104HS-P-EI – 4CH WizSense AI PoE Network Video Recorder (1 HDD, 80 Mbps)
The Dahua NVR4104HS-P-EI is part of the WizSense EI Series and is designed for compact professional surveillance systems that require integrated PoE connectivity and advanced AI video analytics. It supports up to 4 IP camera channels with an incoming, recording, and outgoing bandwidth of up to 80 Mbps, allowing smooth handling of high-resolution streams, including cameras up to 16MP. The recorder also supports efficient multi-channel decoding for smooth live view and playback performance. A key feature of this model is the built-in 4-port PoE switch, which allows IP cameras to be directly powered and connected through the NVR, simplifying installation and reducing the need for external network switches. The AI capabilities are a major strength of this recorder. It supports face detection, face recognition, perimeter protection, and SMD Plus at recorder level. When paired with compatible Dahua cameras, it also enables advanced AI functions such as human and vehicle classification, people counting, heat map generation, and stereo analysis.
KEY FEATURES
- 4-channel P video recording
- Built-in 4-port PoE switch (plug-and-play camera connection)
- 80 Mbps incoming / recording / outgoing bandwidth
- Supports IP cameras up to 16MP
- WizSense AI analytics platform
- AI by recorder: face detection, face recognition, perimeter protection, SMD Plus
- AI by camera: human/vehicle detection, people counting, heat map, stereo analysis
- Up to 10 face databases / 20,000 face images
- SMD Plus intelligent motion detection
- Smart H.265+ compression
- HDMI (4K) + VGA video output
- 1 SATA HDD support (up to 20 TB)
- Up to 4-channel playback
- ONVIF support for third-party cameras
- Simplified installation with integrated PoE
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