A laser tube cutter’s electricity consumption cannot be calculated from its laser output rating alone. For industrial fiber tube cutting, use metered energy or documented average electrical input over representative operating hours, including the relevant auxiliary equipment. Apply your local tariff, then compare energy per accepted part.
The method below helps buyers build an electricity budget without assuming one hourly figure fits every tube laser. Its worked example is hypothetical, not a LONX Laser specification, measured result or operating-cost quotation.
Does a 3 kW Tube Laser Use 3 kWh of Electricity per Hour?
A 3 kW laser-output label does not establish the machine’s electricity use. It describes optical output, while electricity enters the laser source, motion system, controls and any included auxiliary equipment. A supplier’s electrical-input figure describes a different quantity.
For example, BLM GROUP’s LT7 technical information separates these entries:
| Manufacturer-listed LT7 entry | Published value |
|---|---|
| Fiber-source options | 3, 4 and 5 kW |
| Average drawn power, oxygen cutting gas | 15 kW |
| Average drawn power, nitrogen cutting gas | 20 kW |
The page does not assign either average to an individual source option or fully define the metered auxiliaries, sample job and averaging procedure. These are manufacturer-reported LT7 entries, not evidence that a 3 kW laser necessarily draws 15–20 kW or a benchmark for a LONX machine.
Ask what each specification means before putting it into a spreadsheet:
| 仕様 | What it tells you | Appropriate use |
|---|---|---|
| Laser optical output, kW | The laser source’s light-output rating | Process and configuration evaluation; insufficient for an electricity budget |
| Electrical connection or connected-load requirement | A documented installation requirement, potentially expressed in kW, kVA or amperes | Electrical installation review for the exact configuration |
| Average electrical input, kW | Average active power over stated conditions and a stated equipment boundary | Energy estimates when those conditions represent your production |
| Metered electrical energy, kWh | Energy recorded over a defined period | Job, shift or monthly electricity accounting |
Do not add optical-output kW to electrical motor and chiller ratings and call the sum total electrical input. Likewise, do not treat kVA or a connection-current value as a measured average kW figure. Give installation documentation to your electrical engineer; request operating data separately for the budget.
Define the Complete Cutting Cell Before Comparing Consumption
Two suppliers can both quote “machine power consumption” while counting different equipment. Ask for a list of included loads and their electrical feeds.
| Load to check | Question for the supplier or plant team |
|---|---|
| Laser source, drives and controls | Are all machine loads inside the reported measurement? |
| Chiller and cooling equipment | Are these included, separately powered, or measured elsewhere? |
| Fume extraction and filtration | Does extraction run throughout the job, and is its feed included? |
| Compressor, dryer and air treatment | Is the system dedicated to this cutter or shared across the factory? |
| 自動ローディングおよびアンローディング | Does the figure match the automation actually being purchased? |
| On-site gas generation, if used | Where is its electricity recorded and allocated? |
Count each load once: do not add chiller power to a meter reading that already includes cooling. Document shared-utility allocations and exclusions, such as building lighting, so both suppliers’ figures cover comparable equipment.
Calculate Electricity Use in kWh, Then Apply the Tariff
その U.S. Energy Information Administration explains the distinction between power and energy: kW describes power; kWh describes energy used over time.
For a known average electrical input:
Energy (kWh) = Average electrical input (kW) × Time (hours)
If input changes during the shift, calculate each non-overlapping operating period and add the energy. If a suitable meter already records total kWh for the same equipment and period, use that reading directly.
Electricity energy charge = Total kWh × Applicable price per kWh
For time-of-use tariffs, apply each rate to the energy consumed in that rate period. Demand charges, standing charges and taxes need separate treatment according to the actual bill. Multiplying by a per-kWh rate calculates the energy charge, not necessarily the complete electricity bill.
A useful unit check: 12 kW averaged over one hour equals 12 kWh. Write energy as kWh, rather than kW/h. An average of 12 kWh per operating hour is equivalent to 12 kW average input; it still needs a defined operating condition.
Worked Example: An Assumed Eight-Hour Shift
Every input below is hypothetical. The power values, state durations, tariff and accepted-part quantity are chosen only to demonstrate the calculation. They are not typical consumption ranges or LONX machine measurements.
Assume each state-average power includes the same equipment boundary: machine, chiller, extraction and an allocated compressor/dryer load.
| Operating state | Assumed average electrical input | Assumed time | Calculated energy |
|---|---|---|---|
| Active cutting | 12 kW | 5 hours | 60 kWh |
| Loading, unloading and positioning | 5 kW | 2 hours | 10 kWh |
| Ready but idle | 2 kW | 1 hour | 2 kWh |
| 合計 | 9 kW shift average | 8 hours | 72 kWh |
At an assumed USD 0.15/kWh:
72 kWh × USD 0.15/kWh = USD 10.80 per shift
That is USD 1.35 per scheduled hour across the eight-hour period. It excludes other bill charges, non-electric operating costs and any consumption outside the measured eight hours.
If the same hypothetical shift produces 360 accepted parts:
- Energy per accepted part = 72 ÷ 360 = 0.20 kWh/part.
- Electricity energy charge per accepted part = USD 10.80 ÷ 360 = USD 0.03/part.
The part count is an assumption, not a throughput claim. Replace all inputs with evidence for your machine configuration, parts and schedule before making a purchasing decision.
Account for Non-Cutting Time and Compressed Air
Include setup, handling, ready-state waiting and any overnight operation within the budget period. Define what remains on in each state; “standby” does not establish zero input. Use those conditions and durations instead of applying an unexplained utilization percentage to installed load.
In the hypothetical example, one additional idle hour at the assumed 2 kW adds 2 kWh, costing USD 0.30 at the same assumed tariff. That calculation holds only if the input and all other conditions remain unchanged. It is not a measured savings opportunity or a claim that output would remain constant after a schedule change.
Follow the manufacturer’s shutdown procedures; do not disable required cooling, extraction or protective functions to reduce a spreadsheet estimate.
Compressed Air Is a Utility Cost
Ambient air does not carry a purchased-gas price, but compressing and treating it uses energy. The Australian Government’s compressed-air guidance recommends monitoring energy and operating conditions. The U.S. Department of Energy’s industrial sourcebook also accounts for part-load and unloaded compressor operation.
Record dedicated compressor and treatment energy over the job period. For shared systems, ask the utilities team to document the cutter’s allocation and relevant control behavior. Air flow alone does not establish electricity use. If cell kWh already includes compression, exclude that same electricity from any additional air allowance; retain separately identified maintenance costs where appropriate.
Use the required gas or air specification for the approved cutting process. Gas choice, pressure and air quality must support the required result; they should not be changed solely to achieve a lower estimated utility cost.
Compare Energy per Accepted Part
Use a representative batch, with qualified electrical personnel arranging suitable metering. The supplier checklist below doubles as the test record for an existing installation; this guide does not instruct readers to open live panels or install electrical equipment.
For comparing equipment, use the same acceptable batch and document differences in process scope. Report kWh per accepted part alongside job time and other costs. A lower electricity cost per hour may be less attractive if the same acceptable batch takes longer; a higher optical-output rating does not by itself prove lower energy per part.
Record rejected parts and required rework. If rework uses another machine, state whether its energy is included in both comparisons.
Keep Electricity Separate from Total Operating Cost
Budget purchased gas, consumables, maintenance, labor, material losses and ownership costs separately, using actual purchasing records, service information and replacement histories. Avoid universal consumable lifetimes or hourly totals.
If electricity is already included in your machine-hour rate, use the estimate to validate that rate or allocate it separately; do not charge it twice. Label the result as electricity energy charge, utilities cost, processing cost or a broader ownership budget.
What to Request Before Choosing a Tube Cutting Configuration
When reviewing LONX Laser tube cutting machines, connect the utility questions to your actual production requirements.
| Information to request | What makes the answer useful |
|---|---|
| Installation documents | Exact machine/source/automation configuration, supply requirements and units; distinct from production consumption |
| Consumption evidence | Measured or estimated status, test date, average electrical kW and/or metered kWh with start/end times |
| Measurement boundary | Included loads and separate feeds from the equipment table above; exclusions and shared-utility allocations |
| Representative job | Drawing, material grade, profile, dimensions, wall thickness, quantity, gas/process conditions and acceptance criteria |
| Operating schedule | Total job time and cutting, handling and idle periods; equipment remaining on in each state |
| Air or gas supply | Required pressure, flow and quality where applicable; basis for air-system accounting |
| Accepted output | Good parts, rejects and required rework matched to the same energy period |
If a measured figure is unavailable, keep it marked as missing. An installation rating or optical-output number should not be relabeled as a production test result. A preliminary estimate can still help, provided its assumptions and uncertainty are visible.
Send your drawings and production requirements to LONX Laser to discuss a suitable tube cutting configuration and its utility-data requirements. Include the checklist details, local tariff and intended air or gas supply where available so the discussion addresses your actual electricity budget.
