[Unit]
# Don't allow starting the timer if the target is already powered off
Requisite=novaboot-power@%i.service
After=novaboot-power@%i.service
# If somebody powers off the target explicitly stop the timer (if running) too
PartOf=novaboot-power@%i.service

[Timer]
OnActiveSec=10min
Unit=novaboot-power-off@%i.service
RemainAfterElapse=no