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I thought I had read somewhere what the switch itself consumes power-wise, but I can't seem to find it now. I'm hoping the pair of 12 ports I ordered are modest as one of them is going into a solar site that has been kicked in the nads by a power hungry switch . I'm sure hoping its a single digit in watts !

@sirhc , anybody, anybody, @ubnt-buehler LOL


EDIT : According to my KillaWatt meter my 12 port switches pull ~19 watts at idle.

The switch uses about 9 to 10 watts as a base line with no Ethernet links including voltage conversions.

Each additional port when used consumes about 1/2 watt without POE.

The fans use up to 1 watt each at full speed and there are 2 fans in a 12 port chassis.

Then you need to add in the watts consumed by the POE.

Our AC to 48 volt DC power supply is about 90% to 95% efficient depending on temperature.

The on board power conversion from 48V to 24V is about 85%+/- efficient.

One thing you will notice with our current sensors is that Ubiquiti is incorrect on the power consumption of their airMAX radios. They claim 6 watts maximum but that is only true when you average it out over time. They pull upwards of 12 watts when the radio is transmitting heavily.

Ubiquiti is actually high on what they claim the airFIBER 24 uses, I see less than 50 watts on those radios.

The in rush power consumption of our switches is high when you first power them up but that is because our power supplies are actually capable of higher than the wattage they are rated at but they are rated as convection cooled. We went with convection cooled power supplies even though we knew we would have forced air because it will extend their MTBF in warm environments.

We actually pulled 520 watts with our 400 watt power supply in a test environment if that tells you anything.

Out Total power consumption in the UI reports all this and takes inefficiencies in conversions into account, it is pretty accurate.

swEEEEEEEEt I'm sure the 24 port leaf blower (with 5 ports used) is pulling 40-60 watts, I will meter it later for laughs.

The cisco-kit was no friend of mine
The cisco-kit made me lose my mind ...

rockhead,
Once running the switch draws minimally... but as I stated in another thread during startup it's a killer. I needed a 1,000watt DC inverter in order to get a 400 switch to startup.

rockhead wrote:...the 24 port leaf blower...

The cisco-kit ...

Here I thought the leaf blower was an ES24.

mhoppes wrote:rockhead,
Once running the switch draws minimally... but as I stated in another thread during startup it's a killer. I needed a 1,000watt DC inverter in order to get a 400 switch to startup.

Yes but he got the WS-12-250A units they only have a 250 watt power supply verses your 400 watt

Less I see your units will get delivered maybe today?

So he might need a 700watt inverter.... we need DC switches ;-)

mhoppes wrote:.... we need DC switches ;-)

Or an AC primary with DC RPS.

But you're still only able to battery backup with DC... so might as well have the DC switch... or am I misunderstanding you, Les?

It is all about redundancy. A RPS (Redundant Power Source) could be an AC fed power supply with DC output that is used as a backup to AC or the RPS input on the switch could be fed from your own DC plant and the AC supply be the backup.

Having redundant power is nice versus a single non-redundant supply. Many of the HP Procurve switches I put in have redundant power and more than once I've had UPS or TS/DS failures that didn't take me down.