Mining cooling and ventilation consume energy outside the miner itself. They can also affect operating availability and the time during which useful work reaches a pool. Multiplying a device’s advertised watts by an electricity rate therefore gives only part of a site estimate. Define the equipment, measurement boundary, season and allocation method before comparing costs.
Hypothetical 3 kW miner plus 0.6 kW average auxiliary load, each operating for 24 hours.
BTKWIN.COM · EDUCATIONAL EXAMPLE1. Draw the device and site boundaries
List the miner, its power supply and built-in fans first. Then identify external ventilation, pumps, cooling equipment, networking and shared systems. A wall measurement for the miner may already include internal fans and power-supply losses. Adding those components again would double count them, while omitting a room fan would leave genuine site consumption outside the calculation.
In a teaching example, a miner averages 3 kW and external support averages 0.6 kW. Together they draw 3.6 kW. Over 24 uninterrupted hours, their energy is 86.4 kWh: 72 for the miner and 14.4 for support. The auxiliary addition is 20% of miner energy but approximately 16.67% of total energy. Those percentages use different denominators.
| Boundary | Average power | Daily energy |
|---|---|---|
| Miner | 3 kW | 72 kWh |
| External support | 0.6 kW | 14.4 kWh |
| Combined | 3.6 kW | 86.4 kWh |
Do not automatically call all support energy cooling. Depending on the meter, it may include lighting, networking or distribution losses. Name the components before evaluating an improvement. Replacing one fan while other loads change does not isolate that fan’s effect unless measurement or explicit assumptions distinguish the changes.
Understand an energy ratio without mislabelling it
The U.S. Department of Energy discusses PUE as facility energy divided by IT-equipment energy for a defined annual boundary. The concept highlights infrastructure overhead. A simplified mining-room ratio does not establish compliance with every requirement of a formal data-center measurement.
Dividing the example’s 86.4 kWh by 72 kWh gives 1.2 for the chosen boundary and day. This is dimensionless, unlike J/TH, which relates energy to hashing work. If equipment energy increases while auxiliary energy stays fixed, the ratio can decline even though total site energy increases.
Show absolute energy, work and the ratio together. A lower ratio alone does not establish a lower bill, improved profitability or a smaller environmental impact. Those questions also depend on tariffs, timing, energy sources and the equipment’s output. Comparisons between sites require matching definitions and representative periods.
2. Match operating conditions and temperature locations
Use the actual model’s specifications for intake air or coolant conditions, environment and relevant restrictions. A room sensor across the building may not measure the air entering a miner. Chip or board temperature is also a different quantity. Record each sensor’s name and meaning before comparing its reading with a limit.
Manufacturer troubleshooting instructions are specific to equipment and configuration. Use the relevant documentation for the model, rather than turning an example from another product family into a universal temperature setting. Cooling method, altitude and operating mode can all matter to the conditions under which figures are published.
Record temperature, power, hashrate and uptime over the same interval. Falling output alongside higher temperatures can justify investigation, but timing alone does not identify the cause. Logs and the condition of fans, filters, airflow or liquid systems provide further evidence. Preserve protective controls instead of ignoring warnings to maintain a spreadsheet’s projected income.
A cool day does not represent a whole year
Auxiliary equipment may run at different speeds or for different hours across seasons. Suppose average support power is 0.3 kW during one period and 0.9 kW during another. The 0.6 kW difference adds 14.4 kWh over a full day. At an illustrative 0.10 per kWh, that changes daily energy cost by 1.44 currency units.
Split a study into documented seasonal scenarios or use records covering representative conditions. If no hot-season measurement exists, identify that gap. Extending the best observed day across a year hides uncertainty rather than resolving it. Label estimated hours, temperatures and loads separately from measured values.
Cooling needs also do not remain fixed simply because the equipment count is unchanged. Operating modes, active devices and room arrangement can alter conditions. Adding a miner does not prove existing cooling can support it without modification. Capacity and design suitability need an appropriate technical assessment beyond adding electricity charges.
3. Allocate shared systems once
A fan or pump serving four miners belongs once in the site total. If shared equipment averages 0.8 kW for 24 hours, its daily energy is 19.2 kWh. Equal allocation assigns 4.8 kWh to each miner. That is an accounting choice, not proof that each device physically caused an identical portion of the load.
Keep the measured site total beside allocation columns and verify that allocations sum back to it. Another approach may be appropriate when devices differ in operating hours, loads or use of the system. State the allocation rule so that another reader can reproduce the result.
When fewer miners operate, each one’s share of fixed support consumption may rise. That does not necessarily indicate worse device efficiency. Similarly, read hosted-mining contracts before adding separate cooling estimates. An inclusive service fee may already cover electricity and cooling; another contract may exclude maintenance, water or particular failures. Compare matching service boundaries.
4. Include maintenance and availability
Record applicable filters, cleaning, pumps, water, fluid treatment, periodic servicing and installation costs. Separate recurring expenditure from capital items and failure-related repairs. These costs do not become electricity simply because they support operation, and they do not disappear from a project estimate because the meter cannot measure them.
Noise, space, humidity and property requirements also affect suitability. Air, immersion and other liquid systems are not interchangeable modifications for every device. Equipment compatibility and the design of electrical and cooling systems require qualified review. A low calculated energy cost does not demonstrate that a location is appropriate.
Cooling failure may reduce electricity consumption by stopping miners while also reducing revenue and creating repair costs. Do not describe that lower bill as better efficiency. Record downtime, its cause and any support energy that continued. Compare energy per accepted contribution over matched periods rather than judging isolated monthly totals.
In the original example, 3.6 kW for thirty days uses 2,592 kWh. At the fictional constant rate of 0.10, energy costs 259.2: 216 for the miner and 43.2 for support. This excludes service charges, demand charges, taxes, maintenance and equipment purchases. Recalculate each component using its actual hours when equipment does not run continuously.
Preserve the component register, meter boundary, tariff assumptions, seasonal gaps and accepted-work record. The electricity-cost guide explains the billing calculation. A useful site estimate states both what has been counted and which conditions still require measurement or technical assessment.
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English content and examples reviewed: 27 October 2026. Read the Arabic edition.
