submitted 2 weeks ago by [email protected] to c/[email protected]

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Good day, friends. Since catching the self-hosting bug, I've set up a couple of Proxmox home servers with a bunch of services I enjoy.

Now I'd like to set up a server and local network on my sailboat so I can self-host servarr, pihole, and other services while traveling. The tricky part is that everything on the boat is 12V and I would rather not use an inverter, if possible. Also, it needs to be ultra-low power so I can leave it on at all times and not to deplete my batteries too much.

Criteria:

ultra-low power
Small form factor
runs on 12V
10 TB of storage plus ability to make full local backup
Capable of hosting servarr, audiobookshelf, freshrss, etc. via docker
HDMI output
Full local mirror/backup of the entire file system, including the media library.
We will have two laptops and two Android phones to access the server, so the server doesn't need to run a desktop environment.

I'll have a mobile wifi router and a cellular signal booster (or maybe Starlink eventually) for internet access. Since internet bandwidth will be limited and expensive while traveling, I don't want to have to re-download a massive media llibrary if the storage media fail. Thus, I want the media library to be mirrored or fully backed up or synced locally.

What hardware and Linux distro would you use in this situation?

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[-] [email protected] 4 points 2 weeks ago

I think you've hit on the key difference between home and boat use: the variable voltage. My battery varies between about 13.3V and about 11.2V depending on its charge state. I'll look into these.

[-] [email protected] -1 points 2 weeks ago* (last edited 2 weeks ago)

When you are actively charging the batteries off a solar panel for example, it will be even higher, up to ~~17V~~ 14.5V or so I think. The automotive PicoPSUs only cost a little more and will smooth it out up to 24V I think... there are even some models that go up to 48V.

Edit: why the down-votes? Is this incorrect?

[-] [email protected] 4 points 2 weeks ago* (last edited 2 weeks 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

[-] [email protected] 4 points 2 weeks ago

Yes that's incorrect. Open circuit voltage for solar panels can be in the hundreds of volts, but you're never gonna put that into your battery. You're gonna run it through a charge controller that will bring it down to a normal voltage. For a lead acid that will be somewhere around 13.6V and 14.4V for LFP.

this post was submitted on 26 Jun 2024

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