Looks like I should be good with
- 4 X IPC-HFW5442-ZE Specs read Power Consumption :<10.9W
- Switchflex Specs read Power Consumption :5W not including POE power budget
My only concern is this from the switch flex specs:
Max PoE Wattage Per Port | 25W |
Total PoE Power Budget
Powered by 802.3af
Powered by 802.3at
Powered by 802.3bt
Powered by PoE Adapter
(Enabled in Controller) |
8W
20W
46W
46W |
Powered by 802.3af 8W? Does this mean the 802.3af10.9W cameras wont run off of this?
Given the maximum power output for that Flex PSU is 46 watts you have no headroom left if the cameras you indicate consume 10.9 watts. Keep in mind the device can be powered by a more powerful POE injector to solve this problem. As I noted early on my long term goal is to power the same via POE++ (BT) that can provide 90 watts.
My system will never ever break 50 watts but wanted the extra headroom when the mercury drops or if conditions change in the system / network environment. Best practice is to use the maximum power consumption for every device intended to be used to see if you're within the limits of the PSU.
Than, add an extra watt for each device to obtain a fudge / safety factor for the what if's you don't know about.
You don't use that extra 1 watt per device you win - Or you later find out while deploying the hardware in the field each device consumes more power than spec (variance due to manufacture tolerances) you still win because you planned for this out of band power consumption.
You can never go wrong having more power on hand than needed. The reverse is not true as things will quickly burn up due to the lack of power and the PSU tries to meet that demand. In many cases when the PSU goes poof it spikes and takes out what ever device is attached.
Regardless, I always bench test all of the equipment before deploying the same in the field. Since I am still waiting for all of the hardware to arrive I decided to connect and power the hardware on hand to validate what the power consumption was at idle and full load. This is a PSU from a AC Pro I had laying around which is rated for 48 VDC, 24 watts, 0.5 amps, and draws no power while connected. I call this out because there are lots of PSU's that draw power with nothing attached and this is the
Phantom Power consumption that needs to be considered.
This is the Flex Switch connected and at idle and consumes 3.5 watts.
Once the switch was operating for ten minutes I connected a spare Cloud Key which consumes 3.9 watts.
After the controller was running for about twenty minutes I attached a AC Pro to the system which consumes 4.7 watts.
I later connected a thermal camera to the system and stopped there as the PSU is only rated for 24 watts. The meter indicated the current power consumption was 19.1 watts.
Once the PtP radios arrive I'll use the same to setup and validate the power consumption. This is important for me as the same hardware will be deployed in a stand alone solar system in the field. Given winter is seven months long in the Bad Lands the system needs to be designed and built to sustain at least seven days of no sun.
Purchase a larger PSU POE Injector and forego the Flex Box and push forward.
EDIT: Here is the perfect example of why you always plan to have more power as without long term monitoring you'll never know how much power something consumes without actually monitoring it.
The thermal camera at idle consumed 5.68 watts for more than an hour.
Later it spiked up to 7.28 watts and the IR isn't even running yet. That's a difference of 1.6 watts and this is all using the ideal 23 AWG solid copper cabling at a very short run of 15 feet.