this post was submitted on 10 Apr 2025
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Is there a good solution for an entirely off-grid server?

Is it possible to use a smartphone hotspot/USB tethering for internet connection?

I have some solar panels & batteries and an old laptop (or I might get a raspberry pi) and am curious about whether I could selfhost literally in the middle of nowhere, without a residential internet connection?

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[–] [email protected] 3 points 1 week ago* (last edited 1 week ago)

As it happens, I've just finished setting up a system exactly like this for a completely off-grid setup. I needed a Raspberry Pi running Home Assistant to be completely self-contained to monitor an adjacent, larger system that is only powered up intermittently (close enough that the two systems have a common ground).

Short version: the Raspberry Pi and the Huawei LTE router I'm using for connectivity draw a steady 9W between them (there's a lot of monitoring going on). I went with an old pair of 80W panels in very suboptimal positioning, a simple MPPT charge controller and a 110Ah deep cycle leisure battery which costs about €45, €30 and €120 respectively. The system has been running a few months now and the battery had never, ever dropped below 12.4V. The Pi uses WireGuard to connect to my VPS so Home Assistant can be accessed with a web browser since the network I'm using on-site doesn't do public IP addresses.