Dahua NVR4232-EI – 32CH 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 NVR4232-EI – 32CH WizSense AI Network Video Recorder (2 HDD, 256 Mbps)
The Dahua NVR4232-EI is part of the WizSense EI Series and is designed for advanced IP surveillance installations requiring high channel density, AI-powered analytics, and reliable recording performance. It supports up to 32 IP camera channels, making it suitable for large commercial, industrial, and enterprise-grade security systems. The recorder provides a maximum incoming, recording, and outgoing bandwidth of 256 Mbps, allowing efficient handling of multiple high-resolution video streams, including cameras up to 16MP. The system integrates Dahua’s WizSense AI engine, enabling intelligent video analytics such as face detection, face recognition, perimeter protection, and SMD Plus. These features help improve detection accuracy by focusing on human and vehicle targets while reducing false alarms caused by environmental movement. Face recognition supports up to 10 face databases with a total of 20,000 face images, allowing fast identification, blacklist/whitelist matching, and efficient forensic search across recorded footage. When paired with compatible Dahua AI cameras, the system also supports advanced analytics including human and vehicle classification, people counting, heat map analysis, ANPR (number plate recognition), and stereo analysis.
KEY FEATURES
- 32-channel IP video recording
- Up to 256 Mbps bandwidth
- Supports IP cameras up to 16MP
- WizSense AI analytics platform
- Face detection and face recognition
- Perimeter protection (tripwire, intrusion detection)
- SMD Plus intelligent motion detection
- Up to 10 face databases / 20,000 face images
- Human and vehicle classification support
- ANPR, people counting, heat map support (via AI cameras)
- Smart H.265+ compression
- HDMI & VGA output (up to 4K)
- Dual SATA HDD support
- Up to 40 TB total storage capacity
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