Schedule a working hour of WR21 in a day

To save power in the field that only solar power is available, can I schedule my WR21 to work during daytime and idle/off in the nighttime? Thank you!

The problem is the WR21 is either on or off when power is applied to the device.

the only way to reduce power would be to play with the power management and switch off the diffrent parts

else you could use a external time clock to switch it on and off