I ran the numbers with some pretty accurate equipment, but (particularly in the radio tests) different modules gave wildly different values. Even on one module, consumption jumped up and down dramatically. A better test would be consumption over time, to get an average.

Anyway, here are the results I got for various tests:

StateSIM36xxSIM76xxGPS AntennaWIFI APWIFI ClientDEEP SLEEPCAN1VoltsmAmWDiffNotes
Everything off, USB poweredFALSEFALSEFALSEFALSEFALSEFALSEFALSE5.084460.6308.1
+GPS antennaFALSEFALSETRUEFALSEFALSEFALSEFALSE5.083266.7339.030.9
+CAN1 startedFALSEFALSETRUEFALSEFALSEFALSETRUE5.082271.8364.925.9
+WIFI clientFALSEFALSETRUEFALSETRUEFALSETRUE5.081276.0386.221.3
+WIFI AP instead of clientFALSEFALSETRUETRUEFALSEFALSETRUE5.0707126.0638.9252.7
+WIFI AP and clientFALSEFALSETRUETRUETRUEFALSETRUE5.0707126.0638.90.0
Everything off, 12V poweredTRUEFALSEFALSEFALSEFALSEFALSEFALSE12.000017.2206.45V USB supply shows 5.0961V, 9.6mA, 48.9W
+GPS antennaFALSEFALSETRUEFALSEFALSEFALSEFALSE12.000066.7800.4594.0
Deep sleepFALSEFALSEFALSEFALSEFALSETRUEFALSE12.00001.922.8-777.6
SIM5360 modem connected but offFALSEFALSEFALSEFALSEFALSEFALSEFALSE12.000022.9274.8252.0
SIM5360 modem connected but offFALSEFALSEFALSEFALSEFALSETRUEFALSE12.00007.286.4-188.4
SIM7600 modem connected but offFALSEFALSEFALSEFALSEFALSEFALSEFALSE12.000027.0324.0
SIM7600 modem connected but offFALSEFALSEFALSEFALSEFALSETRUEFALSE12.000015.6187.2-136.8
Everything off, 12V poweredFALSEFALSEFALSEFALSEFALSEFALSEFALSE12.000046.6559.25V USB supply shows 5.0961V, 9.6mA, 48.9W
+GPS antennaFALSEFALSETRUEFALSEFALSEFALSEFALSE12.000052.0624.064.8
+WIFI client no APFALSEFALSETRUEFALSETRUEFALSEFALSE12.000063.0756.0132.0
+WIFI AP no clientFALSEFALSETRUETRUEFALSEFALSEFALSE12.000079.0948.0192.0
+No WIFI but cellularFALSETRUETRUEFALSEFALSEFALSEFALSE12.0000110.01320.0372.0
+The lotFALSETRUETRUETRUETRUEFALSEFALSE12.0000160.01920.0600.0
+Deep sleep (GPS connected)FALSETRUETRUETRUETRUETRUEFALSE12.000040.3483.6-1436.4
+Deep sleep (GPS disconnected)FALSETRUEFALSETRUETRUETRUEFALSE12.000035.2422.4-61.2

Note that the USB async serial chip is powered by USB and draws about 49.9mW. When powered by 12V vehicle power, that goes to zero.

I too see about 60mW for the GPS antenna.

But the biggest surprise was the difference between SIM36xx and SIM76xx modems on power down. SIM7600 almost 100mA greater usage power down. I can’t explain that. Something in the SIM76xx is pulling a lot of power even when powered down. Also, bizarrely, toggling the DTR (EGPIO#2) line (implemented in 3.3 to help with sleep) off increases 1.3mA @12V!

Anyway I will work with the manufacturer to try to find out what is using the power in the SIM7600 power down mode.

Regards, Mark

On 3 Feb 2023, at 10:47 PM, Michael Balzer <dexter@expeedo.de> wrote:

Signed PGP part
Mark,

in the thread with Patrick Stein I measured the GPS antenna at ~ 5 mA / 55 mW, and added that info to https://docs.openvehicles.com/en/latest/userguide/warnings.html#average-power-usage

GPS consumption includes the active GPS antenna, which accounts for ~ 5 mA / 55 mW. Antenna power cannot be switched by the module.

ESP32 deep sleep mode (e.g. triggered by the power management module) reduces the consumption to ~ 15 mA / 165 mW with the active GPS antenna attached, or ~ 10 mA / 110 mW with the GPS antenna detached. The hardware isn’t capable to go any lower than this.


But maybe you can do a more precise measurement, I only have some basic electronics tools here.

Regards,
Michael


Am 31.01.23 um 01:53 schrieb Mark Webb-Johnson:


I think it worthwhile having this discussion here. Synopsis seems to be:

  1. Our modem design uses the SIMCOM reference design to power the active GPS antenna from VBAT. This increases power consumption (powering the active antenna), even if the GPS is turned off in software.

  2. There is an alternative approach using pin 44 and the AT+CVAUXV / AT+CVAUXS commands to enable/disable and/or adjust voltage.

Would be interesting to see the exact power readings and impact this change would make. I will try to get these this weekend.

Regards, Mark



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