My 211 receivers draw about 19 watts each. (Actually 19 volt-amps. I don't have a true watt-meter.)
My 311 draws 8 watts.
A SW64 switch on my roof draws 25 watts.
I put a digital timer on my two 211s and the SW64 to shut them off between 11 pm and 8 am. Saves about $5/month. But you have to make sure the receivers are powered up during the daily updates. Also, the potential exists for turning your receiver into a doorstop if it's powered down during a software update or other critical procedure. YMMV