**First, how to properly configure the camera power supply of the entire monitoring system?**
A: This is a common challenge for inexperienced engineers. Many projects face issues where the original power design is insufficient, leading to the need for additional equipment and potential conflicts with the client. The key point here is that when a camera starts up, it draws a much higher current than its rated power. Additionally, long-distance power transmission can cause voltage drops, making the actual power requirement more complex than just summing up the rated power of all cameras.
The correct method is to calculate the total rated power of all cameras, then multiply by 1.3 to account for the starting current. Next, add another 30% to compensate for transmission losses. Finally, include an extra 30% as a buffer for future expansion.
For example:
If a building has 100 fixed cameras, each with a rated power of 4W:
- Total rated power = 100 x 4W = 400W
- Power required after starting current = 400W x 1.3 = 520W
- After considering transmission loss = 520W x 1.3 = 676W
- Final configuration including margin = 676W x 1.3 = 878W
So, the formula becomes:
**Camera power requirement = Rated power × 1.3 × 1.3 × 1.3**
*Note: If the distance is very long, consider increasing the power supply voltage or using a higher capacity power source.*
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**Second, what is the biggest mistake in configuring surveillance camera power?**
A: The most critical mistake is sharing a single power supply for the entire system. Why?
1) When the system is powered on or repaired, all cameras start at once, causing a massive surge in current. This can damage the power supply and lead to instability.
2) If the shared power supply fails, the entire monitoring system goes down, which can be disastrous, especially if critical areas like entrances are not monitored.
The right approach is to use multiple power supplies. For instance, if 100 cameras require about 800W in total, it’s better to divide them into four 200W power supplies. This way, if one fails, the others can still support essential areas without affecting the whole system.
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**Third, what should you pay attention to when choosing a surveillance camera power supply?**
A:
First, avoid connecting cameras with different distances to the same power supply. A longer distance may cause voltage drop, while a shorter distance might receive too much voltage, potentially damaging the camera. However, modern cameras with wide voltage ranges (e.g., 12V–36V DC) are more resilient to voltage fluctuations and can handle surges better, making them ideal for centralized power setups.
Second, if the monitoring distance is very long, consider using a higher voltage power supply, such as 30V or 36V, or even 220V AC, and step it down at the camera end. This ensures stable power delivery and prevents signal loss due to voltage drops over long cables.
By following these guidelines, you can ensure a reliable and efficient power setup for your surveillance system.
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