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Joined 1 year ago
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Cake day: June 25th, 2023

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  • make sure it’s configured for clean shut downs before your battery runs out, auto power up on restoration, and hope it doesn’t happen. you will eventually have an outage that outlasts your batteries.

    I have a large string of batteries from an old telco office, that runs my rack for 14hrs (calculated, I shut everything down around this time) and that did not last for the 2-3 day outage we had after a storm. Without a generator, you will inevitably have an outage, but if you are prepared, then you can mitigate any damage. use NUT if you need to shutdown or power multiple devices from one monitored UPS


  • if they are chaining them bandwidth will add up, and depending on the switching equipment they could be doing a large ring of some sort. it would be pretty easy to calculate since cameras are a pretty even throughput.

    Looks like a air fiber 24 which is only 1.5Gbps throughput, 8-24mbps per camera would mean between 60-200 cameras, which for a state transportation department wouldn’t be unreasonable, especially they are using these for something else, like interconnects between buildings for a metro-lan scenario.













  • jake_jake_jake_@lemmy.worldtoSelfhosted@lemmy.worldServer for a boat
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    5 months ago

    i didn’t downvote but 17v on a 12v battery maybe seems a bit high. I’m more used to about 7-14% over (maybe up to 14v on a 12v batt) when charged/floating but i don’t use solar anywhere currently, and i usually work on 48v systems. i normally expect to see about 54v on a fully charged battery string (13.5v per battery x4) with the rectifiers running.

    i also second the opinion of running an automotive PSU for this situation.

    edit: i looked it up since i was curious, some “12v” solar panels can output between 16-20v, but it’s recommended that you would use a charge controller, especially if you have lead-acid batteries


  • i buy my domains from namecheap but i use cloudflare for name servers (free tier, dns only for everything) and have ddclient (or whatever the newest version is called now) which runs on my router. my current settings only update cloudflare when the interface changes, and then update time after the change is about 15 minutes for propagation. i work in the network department of my isp so my address doesn’t change often, but the isp side of my setup is identical to any other subscriber. i use opnsense, but also manage a very small pfsense box that this works on as well. i update ipv4 dynamically, but not ipv6 yet, but i will.


  • as someone who does stuff in my lab that can translate to a work context, i absolutely second this opinion.

    if i am labbing to learn, then learning the best way to do it is always be the main focus, even if it means restarting what I was doing to change how some prerequisite is setup or functions.

    today, OP is working with jellyfin, but as an example, what happens if later they get security cameras and want to use some sort of local ML to analyze events, and don’t want to put a lot cpu utilization to that task during lulls in activity? a solution might be to dynamically create and destroy containers for the analysis tasks, and the background on a network setup in an unrelated container stack that would allow scaling that means one less problem to solve later.