Hourly or daily power consumption or power average consumption

I've read countless posts about reducing power consumption, and that's not why I'm here. I'm looking to get daily or hourly power usage statistics, so that I can estimate the cost of keeping equipment running 24/7. How do I do that?? I don't need an exact value, I'm ok with a good estimate. I've looked into powertop and /sys/class/powercap/*/energy_uj, but I don't know if I'm reading those correctly, for example: powertop says I use 351J for a sample of 60 seconds:

$ powertop -t 60 -C powertop.csv ; cat powertop.csv | grep 'The power consumed was'
modprobe cpufreq_stats failedLoaded 65 prior measurements
RAPL device for cpu 0
RAPL Using PowerCap Sysfs : Domain Mask d
RAPL device for cpu 0
RAPL Using PowerCap Sysfs : Domain Mask d
Devfreq not enabled
glob returned GLOB_ABORTED
Preparing to take measurements
To show power estimates do 250 measurement(s) connected to battery only
Taking 1 measurement(s) for a duration of 60 second(s) each.
 the port is sda
PowerTOP outputing using base filename powertop.csv
The power consumed was :  351  J;

for the same 60 seconds interval, all the energy_uj files give a completely different value:

$ v0=$(cat /sys/class/powercap/intel-rapl\:0/energy_uj); \
  v00=$(cat /sys/class/powercap/intel-rapl\:0\:0/energy_uj); \
  v01=$(cat /sys/class/powercap/intel-rapl\:0\:1/energy_uj); \
  sleep 60; \
  v1=$(cat /sys/class/powercap/intel-rapl\:0/energy_uj); \
  v10=$(cat /sys/class/powercap/intel-rapl\:0\:0/energy_uj); \
  v11=$(cat /sys/class/powercap/intel-rapl\:0\:1/energy_uj); \
  echo "(($v1 - $v0) + ($v10 - $v00) + ($v11 -$v01)) / 1000000" | bc -l
132.10661700000000000000

Thanks all!