I think it depends on a case by case basis. I've kept everything as AC
with Power supplies for each device simply because I will need to
describe to someone over the phone, in a downpour, at night, how to
troubleshoot a site, when their idea of small tools ends with a 4' Pipe
wrench. Saying 'is there a green light on power supply X' is easier
than trying to track down DC Wires/fuses/breakers. Just have them swap
the bad Powersupply and that either fixed it or, didn't. We also have a
very good Power grid in our area, so we're not overly concerned with
long runtimes. Our average utility failure is <4 hours to restoration.
And I have a pallet of brand new APC XL's that I paid $50 each for. I
can't build a DC plant for less than that. Let alone with all the power
Monitoring the APC Gives me.
If you have a flaky grid and need long runtimes, then DC is the way to
go, no question.
Another Network Engineer I work with prefers all DC Sites. I've never
been able to justify the cost/complexity of pure DC Setups. Especially
when needing to do a mix of 24/48V, as is often present with older gear
at most of our sites.
On 4/26/2024 1:40 PM, Steve Jones wrote:
I have a bunch of various meanwell 48 vDC power supplies mostly 120
and 350 watt models with most loads being 45wattish and some 108wattish.
One site im re-cabling has 1100w in PSUs taking a ton of space
providing for a total demand of around 440w. Seems overkill and only
accounts for the DC direct powered stuff, not the other 300w or so
Whats the consensus on an AC powered site? individual PSUs for ever
equipment. Big PSU/rectifier for all?
Our battery capacity at this particular site is on the APC at the base
providing just AC to the top, we are not bringing the batteries up for
reasons and all electronics are up top.
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