Power metering?

Is there any meter in RouterOS that reports the TOTAL power being used by a router, in particular a router with POE output ports like a 750UP? I know I can get instantaneous power readings for each port, but what I would like to get is a total (or even better, a time graph) for all ports plus the router itself, if possible.

SO far I only saw Voltage on some boards

CCRs and some other high end routers report power usage.

I think the question is a good one. When using rb750UP in a tower running on batteries its nice to find out the total power usage of all attached units INCLUDING the 750 itsself.
It would even better to have an avarage meter readin (say last 10 secs, like in the bandwitdh speedtest) or a graph.

Now you have to averagely guess what the combined powerusage is which is a bit hard since the output readings also fluctuate a lot.

Having a more general power consumption gives you better estimates on how long a setup can work against a certain set of battery capacity.