When running a workshop, understanding your overhead costs is crucial for keeping your business profitable. While materials and machine maintenance are easy to track, utility bills often catch shop owners by surprise.
Wondering how much electricity your laser engraver actually pulls from the wall? The answer depends heavily on your machine type, its wattage, and the auxiliary gear running alongside it.
Power Consumption by Laser Type
Not all laser machines are built the same. The underlying technology dictates how many watts your system draws during an active job:
Diode Lasers (5W to 20W optical power):
Energy Draw: 50 to 200 Watts (0.05 to 0.2 kWh)
The Verdict:
Extremely energy efficient. Desktop hobbyist diodes plug into standard wall sockets and draw roughly the same power as a standard desktop computer or bright household lamp.
CO2 Laser Cutters (40W to 150W optical power):
Energy Draw:
800 to 1,500+ Watts (0.8 to 1.5+ kWh)
The Verdict:
These are the workhorses of most small-to-medium craft and signage shops. While the laser tube itself uses a chunk of power, the heavy electrical draw comes from the high-voltage power supply, water chillers, and exhaust fans.
Fiber Lasers (Industrial metal cutters):
Energy Draw:
2,000 to 10,000+ Watts (2 to 10+ kWh)
The Verdict:
Built for heavy industrial manufacturing, high-powered fiber systems require dedicated heavy-duty electrical lines and draw significant power.
Don't Forget the Peripheral Equipment
When calculating your power draw, you cannot look at the laser tube alone. A complete laser workstation includes power-hungry accessories that run simultaneously:
Exhaust / Smoke Extraction Fans:
Powerful inline duct fans or filtration units can pull anywhere from 150 to 500 Watts on their own.
Water Chillers (CW-5000 series and up):
Unlike simple aquarium pumps, refrigerated water chillers actively cool CO2 laser tubes and can consume 300 to 800 Watts while running a job.
Air Assist Compressors:
Small internal or external piston compressors add another 100 to 200 Watts to your total load.
When you sum up a typical 60W CO2 setup with its chiller, fan, and air assist, your real-world total power draw typically sits around 1.2 to 1.5 kW per hour.
How to Calculate Your Running Cost in Rands
Calculating what your machine costs to run on your local electricity tariff is straightforward using this formula:
Hourly Cost = Total Power Consumption (kW) × Electricity Rate (per kWh)
Example Calculation:
If your total system draw is 1.2 kW and your commercial or residential electricity rate is roughly R3.50 per kWh:
1.2 kW × R3.50 = R4.20 per hour of continuous cutting
Even during heavy production days running the machine for 5 full hours, your active electricity consumption will rarely break R25 to R30 in total power cost.
Smart Ways to Keep Power Overhead Low
While laser electricity costs are generally quite low compared to material expenses or shop rent, you can still optimize your setup:
Power Down Chillers Between Batches:
Leaving refrigerated chillers running idle for hours between jobs wastes unnecessary electricity.
Use Smart Plugs:
Monitor your actual peak loads using a smart plug with energy-monitoring capabilities to see precisely what your unique machine pulls.
Modern CO2 and fiber laser power supplies feature advanced standby modes that automatically throttle down auxiliary power draws when the laser head is idle between vector cuts.
Understanding your laser’s electrical footprint ensures your utility overhead stays accounted for in every client quote.
As local municipal electricity tariffs shift toward time-of-use pricing models, scheduling your heavy production runs during off-peak hours can slash your power overhead even further.
