Uptime, availability, and reconciling the energy model

Availability = uptime ÷ observed window. '99% uptime' means nothing without the window: 99% of a day is 14 minutes off; 99% of a year is 3.6 days off. Miners also differ from servers in HOW they fail — a wedged miner can show 'online' while submitting zero shares, so measure share-producing time, not ping.

You now have two sources of truth: the model (watts × hours × rate = expected cost) and the meter/bill (kWh actually burned). Reconcile monthly: expected kWh = average watts × 720 h × availability. If the bill exceeds the model by more than rounding, hunt the gap — undocumented idle draw, cooling you forgot, a tariff line, or downtime you did not log (which should LOWER energy, a telltale inconsistency).

Pool pages track live worker counts and hashrate — the network-level version of the same availability discipline.