Power for field marking kits

Field marking means managing power on the go

Most marking jobs on site are nowhere near a clean, protected DB board. Whether you're tagging valves in a dusty plant in Secunda or marking asset numbers on a mine outside Rustenburg, you rely on portable setups. The FieldMark Portable kit was built for these jobs, but the power supply depends on what you find at the site.

Out in the field, you are at the mercy of whatever supply the plant or camp offers. Sometimes it is a rough extension cord from a mobile trailer, sometimes a generator, sometimes a building feed that nobody has checked since it was installed. Low voltage, surges, and dirty supply take out more marking jobs than any technical problem with the laser itself.

Lessons we have learned about running lasers off-grid

A fibre marker needs a reliable 230 V supply, not only any socket. Inverters and generators are common on sites, but not all of them can handle the sensitive electronics of a laser source. Modified sine wave inverters often cause the power supply to fail or the controller to lock up. Only use pure sine wave inverters, sized for double the rated power draw of the marking kit.

Our teams see more issues from undervoltage or unstable supplies than from outright power cuts. Spikes can trip the laser, while brownouts quietly corrupt jobs in progress. Always bring a tested surge protector and, if possible, a small UPS just for the controller. This keeps the marking process stable if the supply dips or someone restarts a compressor on the same circuit.

A real site job where power checks saved the run

Recently, we supported a contractor marking asset tags on stainless panels in the field at a coastal plant near Richards Bay. The site was running off a diesel generator with patchy distribution. Before powering up, our team checked the supply with a plug-in tester and found voltage swings outside safe limits.

Instead of pushing through and risking equipment damage, we set up the FieldMark Portable with a pure sine inverter fed by a dedicated, well-grounded battery bank, isolating it from the shared generator. The job ran without a single interruption, and the plant avoided a costly delay.

Steps to keep field marking reliable and safe

Every field job has its own risks, but we see these steps pay off again and again across the country. Skipping any of them invites downtime or worse, equipment damage.

• Test the voltage and frequency at the socket before connecting the kit
• Only use pure sine wave inverters, never modified sine
• Pack a surge protector and a UPS for the controller
• Avoid shared extension leads with heavy machinery
• Check the earthing on site, bad grounds mean trouble for sensitive electronics
• Keep power cables off wet or muddy ground

When to ask for help or advice

If you are unsure about a site supply or your inverter setup makes the marker behave unpredictably, rather ask us before switching on. It is cheaper to pause for advice than to risk a blown power board or a failed marking run.

Send us a message through our contact form with the site location, your marking system, and the power setup you expect. We can advise on inverters, surge protection, and even help plan the right battery or generator size for your situation.