Voltage is usually the first parameter fixed when specifying an electric linear actuator. It decides the power supply, the cable size, and which controllers can be used. This article explains how to choose actuator voltage, how 12V and 24V actually differ, and how to match the control method.

1. What voltage really decides

At the same rated power, a higher voltage means lower current. Lower current has three direct benefits: less stress on the supply and harness, smaller voltage drop along the cable, and less heat. Conversely, a lower voltage means higher current, so cable gauge and supply capacity must grow. Fix the voltage first, then size current, cable and supply.

2. 12V versus 24V in practice

12V is easy to source. Vehicle batteries, common switching supplies and lithium packs work directly, with fewer cells in series and simple wiring. It suits mobile equipment, vehicle conversions, small doors and windows, and furniture. 24V wins on efficiency and margin: at the same force the current is roughly half, temperature rise over long runs is lower, and high ingress protection with heavy loads is easier to achieve. Industrial equipment, solar trackers and multi-actuator synchronized systems generally prefer 24V actuators. Three questions decide it: what DC voltage is available on site, must several actuators move together, and how long and how often does the actuator run.

3. Estimating current, cable and supply

Current can be estimated as power divided by voltage with an allowance for efficiency, but the safer route is the manufacturer rating sheet, which lists rated and stall current. Stall current is typically three to five times the rated value, so supplies and protection devices must be sized on stall. Cable gauge follows current and length; a cable that is too thin causes a voltage drop at the actuator, which shows up as slower speed, reduced force, or a controller misreading position. Supply capacity must also cover simultaneous motion, because two actuators starting together may trip an overload. The LOUIE Electric Linear Actuator datasheet lists both ratings, the most direct basis for supply selection.

4. Matching the control method

The simplest arrangement is a reversing switch or two relays for full-stroke travel only. Stopping at intermediate positions requires an actuator with position feedback plus a linear actuator controller, where limit settings and soft start and stop reduce impact. Synchronized applications need a controller that reads several feedback channels and corrects in real time, otherwise one side reaches position while the other keeps moving and jams. To link with a PLC or an IoT platform, choose a controller that accepts bus or serial commands; stroke memory and fault reporting then come almost for free. LOUIE Electric Linear Actuator supplies control options with limits, position feedback and synchronization for later expansion.

5. Common mistakes

First, choosing by voltage alone and ignoring stall current, so the supply trips the moment resistance appears. Second, wiring a 12V actuator to 24V to gain speed; it looks faster briefly, but current and temperature exceed limits and life drops sharply. Third, driving several actuators from one plain switch with no synchronization or limits, which loads them unevenly. Fourth, ignoring sealing and cable fixing, where connectors fail first in damp or vibrating installations.

6. Conclusion

Voltage, current and control method constrain each other, so calculate them together at the selection stage. Changzhou LOUIE Electric Linear Actuator can review supply, load and cycle frequency and provide rated and stall current for both 12V and 24V options, together with controller recommendations, plus models with position feedback and synchronized control for PLC or IoT integration.