A Pi 5 with RTC. What is the lowest power usage you can get to and still wake up the Pi 5 at 6 am? Is there a simple cheap device you can connect to wake up the Pi 5 (or 4)?
Pi Zero 2s connect to the Pi 5 via WiFi. What is the lowest power you can get them down to while still receiving a wakeup of some sort over WiFi?
The Pi 4/5 might use USB or NVMe SSD. Can that be switched off when not used? Switch off Ethernet? HDMI?
The central PI, I have 5 and 4, will have the right time and clock. The Zero 2s do not need to be woken unless needed. The Pi 5 might wake each hour, check a schedule, and not wake up a Zero 2 until needed. Each Zero 2 will be on battery with a small solar charge. I want to minimise the battery and solar size. That would also eliminate the problem of synchronising the Zero 2 clocks to the central system.
Plus minimise the size of the fire if I use a lithium battery.![:shock:]( "Shocked")
The Pi 5/4 will also have Web and keyboard requests coming in. Switching off everything else would be good. I know SSDs can drop to low levels of use but USB SSDs suck huge power for USB. I now have an NVMe board for my Pi 5. Can that switch down the NVMe SSD to the lowest levels the SSD presents or switch it off completely?
I looked at "hats" for the Pi 4 but they are messy, expensive, and duplicate the RTC in the Pi 5. The minimum Pi 5 is not much difference in price to the same size Pi 4. Add the RTC battery. Doing something inside the 5 would be way better.
If the RTC is not viable, a simple chip waking up the Pi 5 every hour would work. A few seconds of activity every would not use much power. That unfortunately would not handle Web or keyboard requests.
Pi Zero 2s connect to the Pi 5 via WiFi. What is the lowest power you can get them down to while still receiving a wakeup of some sort over WiFi?
The Pi 4/5 might use USB or NVMe SSD. Can that be switched off when not used? Switch off Ethernet? HDMI?
The central PI, I have 5 and 4, will have the right time and clock. The Zero 2s do not need to be woken unless needed. The Pi 5 might wake each hour, check a schedule, and not wake up a Zero 2 until needed. Each Zero 2 will be on battery with a small solar charge. I want to minimise the battery and solar size. That would also eliminate the problem of synchronising the Zero 2 clocks to the central system.
Plus minimise the size of the fire if I use a lithium battery.
The Pi 5/4 will also have Web and keyboard requests coming in. Switching off everything else would be good. I know SSDs can drop to low levels of use but USB SSDs suck huge power for USB. I now have an NVMe board for my Pi 5. Can that switch down the NVMe SSD to the lowest levels the SSD presents or switch it off completely?
I looked at "hats" for the Pi 4 but they are messy, expensive, and duplicate the RTC in the Pi 5. The minimum Pi 5 is not much difference in price to the same size Pi 4. Add the RTC battery. Doing something inside the 5 would be way better.
If the RTC is not viable, a simple chip waking up the Pi 5 every hour would work. A few seconds of activity every would not use much power. That unfortunately would not handle Web or keyboard requests.
Statistics: Posted by peterlite — Fri Mar 08, 2024 11:12 pm — Replies 2 — Views 34