Dahua NVR4104-EI, 4CH WizSense AI Network Video Recorder (1 HDD)
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 NVR4104-EI – 4CH WizSense AI Network Video Recorder (1 HDD)
The Dahua NVR4104-EI is part of the WizSense EI Series, designed to deliver intelligent video recording with built-in AI analytics for small to medium surveillance systems. It supports up to 4 IP camera channels and provides a maximum incoming bandwidth of 80 Mbps, ensuring smooth recording of high-resolution streams, including cameras up to 16MP. The recorder is capable of decoding multiple streams simultaneously, making it suitable for professional surveillance environments requiring both clarity and efficiency. A key strength of this model is its AI capability. The NVR includes AI by recorder functions such as face detection, face recognition, perimeter protection, and SMD Plus. It also supports AI by camera features including human and vehicle classification, people counting, stereo analysis, and heat mapping when compatible Dahua cameras are used. The system supports face database management with up to 10 face databases and 20,000 face images, enabling intelligent identification and search capabilities across connected cameras. With SMD Plus technology, the recorder significantly reduces false alarms by filtering out non-relevant motion such as animals, rain, and lighting changes, improving the accuracy of security events.
KEY FEATURES
- 4-channel IP video recording
- 80 Mbps incoming bandwidth
- Supports up to 16MP IP cameras
- WizSense AI analytics platform
- AI by recorder: face detection and recognition
- AI by camera: perimeter protection, SMD Plus, people counting, heat map
- Up to 10 face databases / 20,000 face images
- SMD Plus intelligent motion detection
- Smart H.265+ compression
- HDMI (4K) and VGA video output
- 1 SATA HDD support (up to 20 TB)
- ONVIF support for third-party cameras
- Remote access via mobile and web platforms
- Compact 1U design for small installations
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