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I'm not exactly sure what the capacity of my 26700 batteries are, but it's likely around 5Ah. I was planning on putting 8 of them in my #meshtastic #solar node (two banks of 4 batteries). So in the ballpark of 40Ah.

I just saw someone post that their RAK4631 and they say it lasts for 18 days on a single charge of a 3Ah battery. 😳

Maybe I should make that two pairs of batteries instead of 2 4-packs. Because a theoritical battery capacity of 240 days (~8 months) is probably not the most effective use of my batteries.

Heck, one 5Ah battery would probably suffice!

The good news is that I can leave the case design alone and just rock two pairs.

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Discussion

shortwavesurfer2009 11mo ago

5v*3ah = 15wh.

i have my sensecap t1000e connected to a 5v 20k mAh (20Ah) battery and its been on for 13 days so far and the backup battery is at like 70%.

the nrf52 is super power efficient.

A 15wh battery (5v @3a) should last a min of 7 days easy.

Dr. Hax 11mo ago

According to the RAK itself, it's currently using 166.2 mA.

This is way higher than what I've seen people post about online who were using an external power meter. (They're ssying around 6 mA)

If it were to use 166.3 mA for 6 hours, it'd use about 1Ah, which would mean a 3Ah battery would not even last a full day. So I'm not sure where it's getting that number, but I'm highly skeptical.

shortwavesurfer2009 11mo ago

I wonder if that's because of the difference between being a router versus being just a standard client.

I would say monitor your power usage for a while and take the highest one you see and make a battery set that will last something like 72 hours with the highest draw you see so that you get a good buffer zone.

so 170ma*72hrs = 12,240mah (12.2A) or 5v*12.24a = 61.2wh

Dr. Hax 11mo ago

Any suggestions for a meter that can take measurents over time?

I only have an DVOA meter that gives me the current measurements.

shortwavesurfer2009 11mo ago

I don't have any suggestions, no. Sorry about that.

SUPERMAX 11mo ago

RAK's are extremely efficient. I've heard similar numbers