Charging Pile or Solar Panel: Choosing Power for a Tower Crane Laser Marker

▌  APPLICATION NOTE  ·  OCTOBER 2026  ·  POWERING A LASER MARKER

Charging Pile or Solar Panel: Choosing Power for a Tower Crane Laser Marker

Every laser marker has to live where the crane works, and the trolley is the place that suits it. The laser head is small, but it still needs a dependable supply to run shift after shift, and on a tower crane there is no convenient socket next to the trolley. How the system is powered therefore shapes the whole installation: where the cable runs, who is expected to maintain it, and how the crew keeps the beam ready for the lifts that need it. The good news is that the ZNAQ-JG1 laser head draws from a 12 V lithium battery, and the manufacturer offers two ways to keep that battery fed.

The first is the charging-pile type: a laser head paired with a trolley charging pile fed by a long cable, plus a 12 V ternary lithium pack whose capacity can be customized. The second is the solar type: a laser head with a 20 W solar panel, also customizable, and a storage control box that holds a built-in 10 Ah battery and contains the charge management. Both options do the same job on site, which is to keep the green landing spot available. The difference is in how they are installed, maintained and chosen.

01  WHY POWER IS THE FIRST DECISION

It is tempting to treat power as an afterthought, but on a tower crane it is the decision that comes first. The laser head is mounted on the trolley and moves with it, so power cannot simply be trailed from a fixed cabinet the way a cab display can. The supply has to be carried on the moving equipment, and whatever carries it becomes part of the daily routine. Choose the wrong option and the crew inherits a maintenance chore; choose the right one and the system fades into the background.

The base specification is the same either way. The ZNAQ-JG1 runs from a 12 V lithium battery, and the head has a metal housing and waterproof connectors so that the supply and its connection survive the weather. Once that is understood, the real question is how the battery is kept charged, because a laser marker that is flat is simply an expensive ornament. The two power options are really two answers to that single question.

▌  POWER DECIDES THE INSTALL  Because the head travels with the trolley, the supply has to travel too, and that shapes the work.

▌  12 V LITHIUM BASE  Both options feed the same 12 V lithium battery, inside a metal housing with waterproof connectors.

▌  TWO ANSWERS  Charging-pile type and solar type differ only in how the battery is kept ready.

02  THE CHARGING-PILE TYPE

The charging-pile type pairs the laser head with a trolley charging pile that is connected by a long cable, and with a 12 V ternary lithium pack. The capacity of that pack can be customized, which matters when a site wants a particular balance between weight and how long the unit can work between charges. The pile gives the system a fixed place to charge on the crane, and the long cable reaches the head where it is mounted.

In daily use, this option suits operations that have a set pattern. The unit is charged as part of the shift routine, and the crew knows where the charging point is because it is fitted to the crane. For a fleet that already follows a disciplined start-up and shut-down checklist, the charging-pile type fits neatly into the habit. For a site that would rather avoid any cable on the structure, it is less convenient, and that is where the solar type earns its place.

▌  TROLLEY CHARGING PILE  A dedicated charging point on the trolley gives the system a fixed place to recharge.

▌  LONG CABLE  A long cable connects the pile to the laser head where it is mounted on the crane.

▌  CUSTOM CAPACITY  The 12 V ternary lithium pack can be specified in different capacities to suit the duty.

03  THE SOLAR TYPE

The solar type pairs the laser head with a 20 W solar panel, whose output can be customized, and a storage control box. Inside that box is a built-in 10 Ah battery and the charge management that keeps it healthy. The panel harvests daylight while the crane is on site, the control box stores what it collects, and the laser head draws from the stored energy. The result is a system with no dependence on a cabled charging point on the trolley.

This option suits sites where running and maintaining a charging cable on the structure is awkward, or where the crane spends long periods in daylight. The trade-off is that the system now depends on how much light the panel sees, so the mounting of the panel and the condition of its surface become part of the routine. The charge management looks after the battery, but it cannot compensate for a panel that is shadowed, dirty or facing the wrong way, so installation still deserves care.

▌  20 W PANEL  A solar panel, customizable in output, harvests daylight to keep the system topped up.

▌  10 Ah CONTROL BOX  A storage control box with a built-in 10 Ah battery and charge management holds the energy.

▌  NO CABLE ON THE CRANE  Nothing has to be plugged in on the trolley, which suits certain sites and access arrangements.

04  HOW TO CHOOSE BETWEEN THEM

The choice should follow the site, not the brochure. Ask first whether there is a reliable way to reach the trolley with a charging pile and a long cable, and whether the crew will genuinely plug the system in as part of the routine. If the answer is yes, the charging-pile type gives a predictable cycle and a fixed charging point. If the crane works where cables are unwelcome, or access to the trolley is awkward, the solar type removes that problem at the cost of depending on daylight.

Then look at the duty. A site that wants the pack specified to a particular capacity for its working pattern is a natural fit for the charging-pile type, where the ternary lithium pack capacity can be customized. A site that would rather not think about charging at all, and that works in daylight for most of the day, is a natural fit for the solar type. In both cases the sensible step is to describe the actual working pattern to the supplier and let the capacity or the duty be matched to it, rather than guessing from a single number.

▌  IF YOU CAN RECHARGE  A fixed charging pile and cable suit a crew that will plug in as part of a disciplined routine.

▌  IF YOU CANNOT RUN CABLE  The solar type removes the charging point at the trolley where running a cable is awkward.

▌  MATCH THE DUTY  Describe the working pattern so capacity, panel output and pack size can be matched to it.

05  KEEPING THE POWER HEALTHY

Whatever the option, the battery is the part that needs looking after. The single most useful care note from the manufacturer is to avoid prolonged daytime use, because running the laser head continuously in full daylight shortens service life. That advice is not a limitation to be worked around; it is a way of making a system rated for at least 5000 hours last as long as it should. Reserve the beam for the lifts that need a landing-point mark, switch it off between them, and let the power system do less work.

The rest is ordinary discipline. Charge as the routine requires, keep the waterproof connectors clean and seated, and remember that the unit is rated to operate between minus 10 and plus 40 degrees Celsius, so extreme cold or heat is outside its design range. A quick check at the start of the shift, confirming that the beam lights and the spot is clear, catches a flat battery or a loose connector before it becomes a problem during a lift rather than after it.

▌  AVOID ALL-DAY USE  Avoiding prolonged daytime use extends service life and reduces the load on whichever power option is fitted.

▌  A CHARGING ROUTINE  Charge the pack as the routine requires, and keep the waterproof connectors clean and seated.

▌  CHECK BEFORE THE SHIFT  Confirm the beam lights at the start of the shift, so a flat battery is caught before the first lift.

PROCUREMENT IMPACT

●  Decide the power option before anything else, because the charging-pile type and the solar type change the scope of the installation.

●  If the site can support a trolley charging pile and a long cable, the charging-pile type with a customized 12 V ternary lithium pack gives a predictable routine.

●  If running a cable on the structure is awkward, the solar type with a 20 W panel and a built-in 10 Ah control box removes that problem.

●  Give the supplier the real working pattern, so pack capacity or panel output can be matched to the duty rather than guessed.

●  Write the care note into the routine: avoid prolonged daytime use, and confirm the beam lights at the start of each shift.

WHAT TO WATCH

●  Watch the light, not just the panel. A solar installation is only as good as the daylight it actually receives on site.

●  Watch the charging habit. The charging-pile type works when the crew plugs it in, and fails quietly when they do not.

●  Watch the connectors. Waterproof connectors stay waterproof only while they are clean and properly seated.

●  Watch the temperature. A unit rated from minus 10 to plus 40 degrees Celsius should not be asked to work outside that range.

●  Watch the daytime guidance. Running the beam all day for convenience is the fastest way to shorten its life.

ABOUT  ZN Industrial (Shandong Zhinuo) designs and manufactures crane safety monitoring systems, positioning systems and mechanical auxiliary handling equipment for overseas construction, industrial and steel markets.

Standards and regulations vary by market — local rules still govern your site.

▌  CONTACT  shandongzhinuo@outlook.com  +86 176 6371 0314 · en.znaqkj.com

SOURCES · ISO 12480-1 · EN 14439 · ASME B30.3 · OSHA 29 CFR 1926 Subpart CC