My system with 24/7 availability:
Gigabyte C246-WU4-CF
Intel® Core i3-8350K @ 4.00GHz
32GB DDR4 RAM
Array:
4 x Seagate Barracuda 3,5" 6TB
1 x Crucial MX500 1TB NVME SSD (for Nextcloud and AudioBookShelf)
Parirty:
1 x Seagate Barracuda 3,5" 6TB - 6TBST6000DM003
Cache:
1 x Samsung NVME SSD 980 - 500GB
Fans:
2 x Arctic F8 PWM PST CO 80mm
1 x Arctic P12 PWM PST CO 120mm
PSU:
CoolerMaster G550M
Case:
Codegen 4U-500 v1 case.
USB:
Sonoff Zigbee USB dongle CC2652P
RFXcom rfxtrx433XL
DVB stick RTL2832U + R820T2
Microsoft Xbox One Digital TV Tuner
Smargo Smartcard Reader V2
SanDisk Cruzer Blade - 8GB for OS
Dockers:
Audiobookshelf
Pi-Hole
DelugeVPN
FR24Feed-Piaware
Glances
Grott
Home-Assistant
Homer
Krusader
MariaDB
Mosquitto
NextCloud
Nginx
Nginx-Proxy-Manager
Oscam
SmokePing
Syncthing
TVHeadend
VaultWarden
Zigbee2MQTT
-----------------------------------
Idle: ~34W
In Use: ~48w
Parity check: ~55W
Full: ~80W (only during stresstest, never happens)
Boot: peak at ~92W
Daily average: 0.98 - 1.02 KwH a day (measuring since 17Oct2022) which averages out at 42W an hour.