alt Hacker NewsI haven’t found a solution for a single DC power supply I can connect to the systems. Maybe I have to solder something together myself.
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Meanwell is the standard answer for this sort of thing; something in the SD-500 family or sized/optioned as you need. You'll have to do the connectors yourself; you may be able to find junction-post-to-barrel-plug leads of the right size and length off the shelf, but I'd be surprised, and soldering them would take less time than shopping for them.
An old PC ATX power supply is great for most things that use 5/12V. You get the 2 most common voltages for network gear, with plenty of capacity and efficiency (with a decent PSU.)
You do have to solder, though I wouldn't be surprised if one can find sata power to barrel adapters on AliExpress.
Man, I spent a lot of time looking for something like this when i bought my NAS and got annoyed with all the power bricks. Guitar players use them[0] to power their several guitar pedals, but the polarity, voltage and plug form factors are all the same, as far as I know. The various devices i have use slightly different plugs, polarities and i think not all are 12VDC.
I'm very surprised that nothing like this exists in the tech/IT space. There can't be that many form factors, voltages, etc. to deal with.
[0] I think something like this: https://www.monoprice.com/product?p_id=600062