Hi,
I’ve come back to LoRa after a brief spell away and I’m trying to develop a LoRaWAN logger where the overriding parameter is battery life. I understand the major parameters which will determine this but I’m struggling to find which module can be configured for the lowest sleep current. Any help would be appreciated.
----------- only LOW SLEEP CURRENTS make it to these lists --------------------------------
GROUP 1 / factory certified modules with LoRaWAN stack onboard
1 - MICROCHIP RN2483A
2 - LAIRD RM186
3 - MULTITECH mDot
4 - IMST IM880A
5 - NEMEUS MM002
6 - RAK 811
7 - RAK 813
8 - MULTITECH xDOT
9 - MURATA CMWX1ZZABZ-091
10- USI WM-SG-SM-42
11- SPARKLAN WLRS-590
12- EMBIT EMB-LR1272
13-
GROUP 2 /non factory/ non certified (open source?) modules
1- GRASSHOPPER
2-
3-
GROUP 3 / DIY pcb’s and specials
1- The nanoPower by LoRaTracker
2- mini LoRa by CH2I
3-
4
if you want a product added please post a link and in which group you think it should be
if you see any errors let me know 
… after compiling the lists I’ll make a spreadsheet with more tech details,
xDot, less than 6uA in sleep.
mDot was only 50uA
Here a picture, 1µA 
I did design a board that you could add to any project and it reduced sleep current to 0.001uA or less;
http://www.loratracker.uk/?p=633
Controlled by an I2C connection, easy to use.
Errr…is the module asleep (as in able to wake up relatively quickly) or completely off and booting from cold?
It appears to switch off power completely, how would it otherwise be able to get down to 1nA battery use in sleep mode. The nanoPower board does however require its own battery which will last for (only) max 1 year.
Its off.
For a lot of situations, that is just fine.
I am working on building the circuit into an ESP32 powered board. The addition of the RTC is useful in itself and you then have the choice of effectivly zero sleep current by powering down via the RTC or 10uA with standard ESP32 deep sleep stuff.
I wanted to have the option of also allowing the board to use the SD card for logging, but powering that down seperatly to a LoRa devcie introduced too much in the way of complications, so using the RTC to power down the circuit is one way around this.
I assume this list is about factory and certified modules with buildin stack … @stuartlea ?
we can make a second list with those… if you provide the links where to order them ?
so NO building tutorials or pcb’s only… these could be in a third list 
there is a slight risc that this topic goes in all directions… and ends nowere