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Cake day: June 12th, 2023

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  • rmuk@feddit.uktoSelfhosted@lemmy.worldOff-grid hosting
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    3 days 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.















  • I’m a bit late to the conversation here, but I bought four of these car seat occupancy sensors - https://www.ebay.co.uk/itm/316523892197 - and installed them between the mattresses, one at butt level and the other at shoulder level on both sides of the bed - and connected them to an ESP32 on ESPHome. Works a treat. They’re sensitive enough to momentarily disengage if someone rolls over or shuffles about if you need that, otherwise a generous bounce detection allowance smooths it out.