PoE power budget calculator
List the devices you plan to power over Ethernet. The calculator totals their draw, adds headroom, counts the ports you need and lists PoE switches from our range that cover it.
Power budget
106.8 W
PoE budget needed, including 20% headroom
- Total device draw
- 89 W
- Headroom, 20%
- +17.8 W
- PoE ports needed
- 13 ports
- Highest single device
- 25 W
- Port standard needed
- 802.3at, 30 W
Some devices draw more than 30 W, which is beyond 802.3at. They need 802.3bt ports or a separate power supply.
8 switches in our range fitPlanning figures. Cable length, cable quality and the devices fitted change the power available at each port.
PoE switches that fit
No switch in our listed range covers this load on its own. Send the details through the form below and our sales desk will suggest a combination or a larger switch.
Only switches with a listed PoE budget are shown. The budget is the total a switch can supply across all its ports. See all PoE switches and Cat6 cable for the runs.
Model NVR
- Channels
- HDD bays
- Max resolution
- Input rating
Drives
Model SFP
- PoE ports
- PoE budget
- Uplinks
- Port speed
This design needs more than 802.3af ports. The datasheet does not state the standard here, so check it supports 802.3at before ordering.
How the budget works
A PoE switch has a total power budget shared by all its ports, as well as a limit for each port. The calculator checks both.
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Total draw
sum of (quantity x watts) for every row
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Required budget
total draw x (1 + headroom)
Headroom covers power lost in the cable, start-up peaks and devices you add later.
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Ports needed
one PoE port for each device
Count spare ports separately if you expect to add devices. The uplink to the recorder is a separate port.
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Matching switches
PoE ports at least the ports needed, PoE budget at least the required budget
Switches with no listed PoE budget are not shown. If no single switch fits, the calculator looks for the smallest number of identical switches that share the load.
| Standard | Also called | Per port, at the switch |
|---|---|---|
| IEEE 802.3af | PoE | up to 15.4 W |
| IEEE 802.3at | PoE+ | up to 30 W |
| IEEE 802.3bt | PoE++ | up to 60 W or 90 W |
| Device | Assumed draw |
|---|---|
| Dome camera | 5 W |
| Bullet camera | 6 W |
| Bullet camera, long-range IR | 8 W |
| PTZ camera | 25 W |
| Wi-Fi access point | 12 W |
Cable and power limits
- Long cable runs reduce the power available. Power is lost as heat in the cable, so the device receives less than the port supplies, and more is lost on longer runs.
- PoE runs are limited to 100 m on Cat5e or Cat6. Keep long runs well inside that, or allow extra headroom.
- Use solid copper Cat6. Copper-clad aluminium has higher resistance and delivers less power over the same distance.
- Infrared lamps, heaters and motors raise a camera's draw. Use the maximum figure on the datasheet where you can.
Products for this system
Ask for a quotation
Press Ask for a quotation in the results panel and your devices and results are added to the requirement field. Add your contact details and send. Our sales desk will reply with matching PoE switches and Cat6 cable, subject to stock.
To talk it through, call +91 94350 11393.