Since the (public) power grid is part of the hardware your local weewx installation is running on, this is far from being off-topic. Yet it's kind of complicated to switch to another. My UPS kicked in a couple of times already, but I only connected it to the NAS.as long as I am at home I shoudn't run into any trobles, if there is a blackout, I have a 22kWh battery and my inverter has one socket that provides up to 3600W in case of an power outage. I am not sure if I'll invest in an automatic full-backup switch, with all the work to be done it will cost way more than €1000...
The new zbox is up and running in the meantime, it sure is a nice little computer. Cameron D schrieb am Donnerstag, 16. Mai 2024 um 04:46:14 UTC+2: > Will get back on track eventually, but I was inspired by the mains > stability plot to look at my data. I have nearly 13 years of data from my > PV system and did a histogram of the daily averages - so far just for > frequency. > [image: distribution of daily averages.png] > Curious - almost always below 50.0. I can remember some years ago > readiing that the mains frequency was always manipulated to reach a daiily > average of 50.000 Hz, in part so that old style clocks would run > accurately. > So, what's happening here? > It seems unlikely that my inverter gets such a simple measurement wrong, > so is the correction no longer applied, or is it simply that the > corrections are made when the power system is at lowest load and my > inverter is offline? > > > So as not to be totally off-thread, I'll mention my system. I have my > weather devices connected directly to an home server based on an Intel > desktop, with a Raid-5 array. I built this in 2010 from three WD black > drives and when they had accumulated 10 years of run-time I decided to > retire them. I tossed up going to SSD, but decided on WD Reds. After > building and copying the new array I then discovered they were the > (unspecified) shingled drives. Still, they came with a 3-year warranty, so > I thought I'd see how they went. All good when I tested nearing the 3 > years, and 3 months later the first one collapsed dramatically. Out they > went, to be replaced by SSDs. The reduced power consumption should more > than make up for the cost difference - assuming they last a reasonable > time. > > I don't recall any unexpected shutdowns since 2011, so never thought of > using a UPS, but I acquired one recently, so thought I'd connect it up. I > invoked the gods of irony upon myself, by deciding to first test out the > Linux drivers for the UPS, before plugging the server into the UPS power. > I'd run out of USB ports on the server, so unplugged the mouse that is > never used, plugged in the USB cable to the UPS and the server instantly > started rebooting. > > On Wednesday 15 May 2024 at 3:22:24 pm UTC+10 Karen K wrote: > >> michael.k...@gmx.at schrieb am Samstag, 24. Februar 2024 um 08:20:17 >> UTC+1: >> >> Also, we have super stable power supply here. Often years without power >> surge, the last black some years ago, and this only locally. >> >> >> Off-topic-comment: That's interesting. The situation at our region is >> quite less stable. The voltage jumps up and down, and the frequency is >> decreasing actually. >> >> [image: netzspannung-8.png] >> >> [image: netzfrequenz.png] >> > -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to weewx-user+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/a1f3113b-c2cb-4220-9e89-1a8f32e180d6n%40googlegroups.com.
