User Manual

Note that 10mA or so is for the ATSAMD chip, so that means you've got ~12mA for the WiFi module.

If you want ultra-low power you can manage the WINC1500 module your own with

And then when you want it to go to sleep call:

With this mode, you can get much much lower power when you call the requestSleepmode (basically 1-2mA) and still

have an active live WiFi connection...but, when not actively sleeping the power usage seems higher (see that spikey

part between seconds 3 and 8.5)

A mix of the two may give you the best performance. And don't forget that the SAMD21 is going to draw 10mA so put

the main chip to sleep too if you want to get to very low power sleep modes!

WiFi.lowPowerMode();

WiFi.setSleepMode(M2M_PS_MANUAL, 1);

WiFi.requestSleep(sleeptimeinmilliseconds)