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 [email protected] 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 [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/dbb7b0b0-20c5-4a45-b398-991fc2b9c28dn%40googlegroups.com.
