Since I accidentally derailed your thread, I figure I should reply to your original query.
I'm a fan of reducing complexity where possible. The problem is that defining complexity is often ISP and site specific, and sometimes the least complex solution is also impossible to have staff maintain. Regardless: One strategy I use is to try to reduce the number of active "blocks". I'd rather have one really good 48V supply instead of several. The reason behind this is that each piece of electronics has a certain failure rate. When you have multiples you find that the failure rate is the combination of all so if you have 5 supplies with similar failure rates, you're going to visit the site 5 times as often for failed supplies. At an AC site, I'd use one supply for each voltage. I wouldn't do any DC-DC since a DC-DC would rely on one of the AC supplies working. Note that this statement doesn't apply to a DC site. The main exception to the above at an AC site is that I would, in some cases, choose to do multiple power supplies if it gains redundancy. I.E. if you do one big power supply which fails, your entire site is down. If you do small ones, then only the items on the failed supply is down. How extreme you want to go here is up to you - but you're also trading redundancy for a mess. If I did this, I'd probably just do the 'a/b side' thing where I essentially build two sites connected to each other, with redundant backhauls (one per side). On Fri, Apr 26, 2024, 12:49 PM Steve Jones <thatoneguyst...@gmail.com> 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. > > > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
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