12V vs 24V Linear Actuators: Which Voltage Is Right for Your Project?
- Xie
- Apr 17
- 5 min read
In the world of motion control, the decision between a 12V and a 24V system is one of the most fundamental choices an engineer or designer must make. While both voltages are widely available and can often achieve the same mechanical output in terms of stroke and force, the underlying electrical efficiency and system-wide costs differ significantly.
Choosing the wrong voltage won't just impact your actuator's performance; it can lead to overheating, excessive voltage drop, and unnecessarily high costs for heavy-gauge wiring. Whether you are automating a simple home project or designing a fleet of industrial solar trackers, understanding the nuance of 12V vs 24V linear actuators is critical.
Key Takeaways
Power Efficiency: 24V systems are generally more efficient for high-power or long-distance applications because they draw half the current (amperage) of 12V systems to perform the same work.
Wiring Costs: Because 24V draws less current, you can use thinner, less expensive wiring over longer distances without significant energy loss.
Heat Management: Lower amperage in 24V systems results in less heat generation, which can extend the lifespan of controllers and connectors.
Compatibility: 12V is the standard for automotive and most existing mobile/off-grid battery systems, making it the "plug-and-play" choice for RVs and boats.
The Core Difference: It’s All About the Amps
The primary difference between 24VDC vs 12VDC actuators is not how much "strength" they have, but how they handle the flow of electricity. To understand this, we look at the basic electrical power formula:
P = V * I
Where P is Power (Watts), V is Voltage (Volts), and I is Current (Amps).
If an application requires 120 Watts of power to move a heavy load:
A 12V system requires 10 Amps of current (120 / 12 = 10).
A 24V system requires only 5 Amps of current (120 / 24 = 5).
By doubling the voltage, you halve the current. This reduction in amperage is the "secret sauce" that makes 24V systems the preferred choice for professional and industrial engineering.
Is 24V Better Than 12V for Linear Actuators?
Technically, 24V is better than 12V for linear actuators when efficiency, distance, and heat management are priorities. However, "better" is subjective to your power source. If your project is integrated into a vehicle with a standard 12V battery, a 12V actuator is "better" because it eliminates the need for expensive voltage converters.
If you are starting a project from scratch with a dedicated power supply, 24V is almost always the superior engineering choice due to its ability to minimize electrical resistance losses.
Efficiency and Heat: The Power Formula
Managing Current Draw (Amperage)
High current is the enemy of efficiency. When current flows through a wire, it encounters resistance, which converts some of that electrical energy into heat. In a 12V system, the higher amperage means your switches, relays, and motor controllers must be rated to handle more "flow." This often results in bulkier and more expensive control components.
Heat Dissipation and Component Longevity
Heat is a primary cause of premature motor failure in DC linear actuators. Because 24V actuators operate at lower current levels, the internal motor windings and the control electronics generate significantly less heat during the duty cycle. This makes 24V systems more resilient in high-use environments where the actuator is cycling frequently.
Practical Implications: Wiring and Voltage Drop
One of the most overlooked aspects of linear actuator voltage selection is the physical wiring required to connect the device to the power supply.
The "Long Run" Problem
Voltage drop occurs when the resistance in the wire causes the voltage to decrease by the time it reaches the actuator. This is a major issue for 12V systems. If you are running a cable 20 feet from a battery to an actuator, a 12V system might lose 1–2 volts, significantly reducing the actuator's speed and lifting capacity.
Reducing Costs with Thinner Wiring Gauges (AWG)
Because 24V systems are more "immune" to the effects of voltage drop (relatively speaking), you can use a smaller wiring gauge (AWG).
A 12V actuator drawing 20 Amps might require a thick 10 AWG wire to prevent overheating.
A 24V actuator performing the same task would only draw 10 Amps, allowing for 14 AWG or even 16 AWG wire.
For large-scale installations—like a factory floor or a solar farm—the cost savings on copper wire alone can make 24V the only logical choice.
Performance Myths: Does Higher Voltage Mean More Force?
A common misconception is that a 24V actuator is "stronger" than a 12V actuator. This is false.
Actuator load capacity (push/pull force) and extension speed are determined by the motor's internal windings and the gear ratio of the gearbox. Manufacturers usually offer the exact same actuator model in both 12V and 24V versions. Both will have the same 1,000lb lift capacity and the same 0.5"/second speed. The only difference is the electrical "diet" they require to achieve those results.
Application Breakdown: When to Choose 12V vs. 24V
Best Use Cases for 12V Systems
Automotive & RV: Almost all cars, trucks, and RVs operate on a 12V DC architecture.
Marine: Boats typically utilize 12V battery banks for house power.
Small DIY Projects: Many consumer-grade batteries (like those for power tools) or simple 12V "wall wart" adapters are easily accessible for hobbyists.
Best Use Cases for 24V Systems
Industrial Automation: Most industrial PLCs and control systems run on 24VDC as a standard.
Solar Tracking Systems: Large solar arrays often use 24V or 48V banks to minimize transmission loss across the field.
Medical Equipment: Hospital beds and patient lifts often use 24V for more precise control and better heat management in sensitive environments.
Home Automation: For motorized windows or skylights where the power supply is far from the window, 24V is used to combat voltage drop.
Can You Run a 12V Actuator on a 24V Power Supply?
No. Never run a 12V actuator on a 24V power supply without a voltage regulator. Connecting a 12V motor to 24V will cause it to spin at roughly twice its rated speed, generating extreme heat and likely burning out the motor windings or stripping the gears within seconds. Conversely, running a 24V actuator on 12V will result in a sluggish, weak performance, and it likely won't be able to move its rated load. Always match your linear actuator power supply to the rated voltage of the motor.
Conclusion: Making the Final Decision
When deciding between 12V vs 24V linear actuators, start by looking at your power source.
If you are tied to a 12V battery (vehicle/boat), stick with 12V.
If you are building a system from scratch, especially one involving long wire runs or high-power demands, choose 24V.
By opting for 24V, you benefit from lower current draw, cooler operation, and cheaper wiring—a trifecta of engineering advantages that leads to a more robust and professional installation.
FAQ
1. Is 24V safer than 12V?
Both are considered "Safety Extra Low Voltage" (SELV). Neither carries a high risk of electric shock to humans under normal conditions, though both can cause sparks or fires if short-circuited.
2. Does 24V make the actuator move faster?
Only if the actuator was designed for 24V. A 24V-rated actuator will move at its rated speed on 24V. It does not move "faster" than a 12V-rated version of the same model; it simply does so more efficiently.
3. Which voltage is better for battery life?
If the Watt-hour capacity of the battery is the same, there is no difference in runtime. However, 24V systems are often slightly more efficient due to lower heat loss, which may result in a marginal increase in overall battery longevity.
4. Can I use a 12V controller for a 24V actuator?
No. Motor controllers and relays are rated for specific voltages. A 12V controller will likely fail or trip its protection circuits if subjected to 24V.
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