Lithium would be the way! Already studying a solution this way. But I need a process to download the console and shutdown the pi. I could also do without the weewx's LOOP, something with weectl.
On Sunday 23 June 2024 at 16:33:07 UTC-3 michael.k...@gmx.at wrote: > After optimizing the power consumption, consider using an LTO (Lithium > Titanate Oxid) battery, it should outperform the AGM in every aspect. The > downside is you need a rather sophisticated battery management and for LTO > batteries, there isn't really much to find. Depending on how low the > temperatures really get, LiFePO4 batteries should also do the job, and > there are lots of BMS on the market. > vince schrieb am Sonntag, 23. Juni 2024 um 20:10:05 UTC+2: > >> Wow - very interesting setup. A lot of questions come to mind: >> >> - what model pi are you running ? >> - have you stripped the os down to the bare minimum number of >> processes running ? >> - have you stripped down the services weewx runs to the minimum ? >> - what is the power savings you measure by killing weewx ? >> - do any of those changes have measurable impact on power consumption >> ? >> >> For a pi-only software solution I'd just use bash and cron periodically: >> >> - check if weewx is running or not >> - if not, start weewx up and await it running the WU upload after >> the first archive period >> - watch the weewx log to see if the WU upload has logged that it has >> completed its upload. You could do this with a custom rsyslog.conf entry >> and log only WU stuff to a particular file >> - when the WU log is populated, rotate that logfile (for the next >> run) and kill weewx and exit >> - (and use cron to periodically start the script of course) >> >> Basically your script would watch for the WU-only logfile to be non-zero >> size with a particular content in it saying the upload was complete. >> >> For a hardware solution I'd look for a hardware-only way to use an >> arduino or pi pico to actually power the raspi down completely, but then >> you'd need a RTC in the weewx pi (another battery needing to work in low >> power). One interesting link I found with pointers to some others is >> https://stfn.pl/blog/34-pico-power-consumption-solar-panels/ if that >> helps any. The author there has a lot of links and there are pointers to >> some adafruit boards that might help if you wanted to try a hardware >> solution. >> >> FWIW - I fiddled with deepsleep etc. on a pico when they came out but >> didn't have anything that could measure how little power they sip when deep >> sleeping. I do know that a pi itself still draws a lot of power when >> powered off although you can edit the os setup to minimize this. See >> https://www.jeffgeerling.com/blog/2023/reducing-raspberry-pi-5s-power-consumption-140x >> >> for details. I can confirm his blog solution works on a pi5 and pi4 but >> never tried it on a pi3 or zero or old model-B so I don't know there..... >> >> On Sunday, June 23, 2024 at 9:47:46 AM UTC-7 tguo...@gmail.com wrote: >> >>> Thanks Greg! this should be achievable knowing the code. Would really >>> help! >>> >>> (had to google it MIB: Management Information Base) >>> On Thursday 20 June 2024 at 14:20:54 UTC-3 Greg Troxel wrote: >>> >>>> Indeed the real goal is important. >>>> >>>> I can certainly see having weewx have some kind of status output (a MIB >>>> :) that indicates whether it has successfully processed all the archive >>>> records and written the database (and run reports), so that a >>>> supervisor >>>> process can shut it down. >>>> >>>> I do not see most people wanting to spend time on that, so the OP has >>>> some code to write. >>>> >>>> -- 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/6571093b-852c-4c0e-970b-ae62b2226356n%40googlegroups.com.
