24V vs 48V LED Strip Lights: Voltage Drop, Wiring, and Installation Distance
For an LED strip installation with the same power demand, a 48V system draws about half the current of a 24V system, which can reduce voltage drop in the supply wiring and make longer runs easier to design. However, 48V does not guarantee a specific maximum installation distance: the strip’s power per metre, copper layout, wire gauge, feed locations, and driver capacity all matter. At ENTA Lighting, we recommend comparing the complete electrical setup—not voltage alone—before selecting a strip for a long run.
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Quick Comparison: 24V and 48V LED Strips
Both 24V and 48V LED strips use constant-voltage power supplies designed for the strip’s rated input. The practical difference is current: at equal power, higher voltage requires less current. Lower current can reduce losses along the power cable, but voltage can still fall along the LED strip itself as current travels through its copper traces.
- Choose 24V when you need a widely used system, shorter sections, or convenient compatibility with existing 24V equipment.
- Consider 48V when a project has longer supply routes or higher total power and reduced current in the feeder wiring is valuable.
- For either voltage, confirm the strip’s specified maximum run, power per metre, driver requirements, and feed method with the manufacturer.
How Voltage Drop Affects LED Strip Installation
Voltage drop in the supply wires
Voltage drop is the reduction in voltage between the power supply and the load. It occurs because wires and conductive paths have resistance, and the drop increases as current or conductor resistance increases. A simplified relationship is voltage drop = current × resistance; therefore, longer or thinner wires generally create more drop than shorter or thicker wires of the same material.
Consider a 96W load. At 24V, its nominal current is 4A; at 48V, the same power requires 2A, using the relationship power = voltage × current. If the supply cable has a total loop resistance of 0.1Ω, the corresponding cable drop is 0.4V at 4A and 0.2V at 2A. These figures are an illustrative calculation, not a promised installation result; actual resistance depends on cable length, conductor size, temperature, and connections.
Voltage drop along the strip
The strip itself also has resistance. Current flows through its copper traces to power the LEDs, so voltage may decrease along a long continuous section. The result can be lower brightness or a visible difference between the beginning and end, although the effect depends on strip design, power density, installation conditions, and how the strip is fed.
A 48V input may help reduce current for a given power level, but it does not remove resistance from the strip or eliminate the need to follow the product’s specified maximum run. The conductor layout and electrical design of the specific strip matter. For this reason, do not assume that every 48V product can run twice as far as a 24V product.
Wiring and Installation Distance
Plan the power supply and cable together
Start with the total strip length and the rated power per metre, then calculate the expected load. Select a compatible constant-voltage driver with sufficient rated output for that load, following the manufacturer’s instructions and any applicable project requirements. Keep the driver’s output voltage matched to the strip: a 24V strip requires a suitable 24V supply, while a 48V strip requires a suitable 48V supply.
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Next, estimate the cable run from the driver to the strip and select a conductor size based on current, distance, allowable voltage drop, installation method, and local electrical requirements. Keep the outgoing and return conductors in the calculation; the current travels through a complete circuit, so considering only the one-way distance can underestimate cable resistance. Where cable distances are substantial, ask the project electrician or supplier to verify the calculation before installation.
Use appropriate feed points for long runs
For a long strip layout, one feed at the first end may not provide consistent voltage across the entire length. Depending on the product’s instructions and the electrical design, the installation may need additional power injection points, separate parallel-fed sections, or shorter strip sections supplied from a suitable distribution arrangement. Do not connect multiple power supplies together on a strip circuit unless the product documentation specifically permits the configuration.
Power injection can reduce the distance current must travel through the strip traces, but it does not increase the rated maximum run of an individual section. Plan feed locations before cutting or mounting the strip, and ensure connectors, wiring, and terminals are rated for the expected current. For 48V systems, use components specified for that voltage; do not assume that connectors or controllers intended for 24V are suitable.
24V vs 48V: Buyer Comparison
| Consideration | 24V LED strip | 48V LED strip |
|---|---|---|
| Current at equal power | Higher current than a 48V setup at the same wattage | About half the current of 24V at the same wattage |
| Supply cable voltage drop | Can be higher when cable resistance and power are unchanged | Can be lower under the same comparison conditions |
| Maximum continuous strip length | Depends on the specific strip and feed design | Also depends on the specific strip and feed design |
| System compatibility | Requires a compatible 24V driver and controls | Requires a compatible 48V driver and controls |
| Best selection basis | Existing system compatibility, project load, and product limits | Longer feeder routes, project load, and product limits |
How to Choose for Your Project
Choose by installation conditions, not voltage alone
For a short cabinet, display, or cove-lighting section, a 24V strip may be a practical fit when its rated run and output meet the design. For a larger indoor layout with longer power cables, 48V may be worth evaluating because the lower current at equal power can help manage feeder-wire drop. In both cases, the strip’s own maximum run and required feed arrangement remain decisive.
Compare the complete system cost as well. A higher-voltage option may require a different driver, controller, connectors, or installation workflow, while an existing 24V infrastructure may make a 24V product simpler to source and integrate. Request the product’s power-per-metre rating, maximum continuous run, wiring diagram, cutting interval, and driver recommendations before finalizing the bill of materials.
Common mistakes to avoid
- Assuming voltage determines distance: no universal maximum applies to all 24V or 48V strips.
- Ignoring cable resistance: calculate the full circuit and account for conductor length and size.
- Mixing voltage ratings: match the driver and compatible control equipment to the strip.
- Exceeding a product’s run limit: use the specified feed method and divide the layout into suitable sections when required.
- Choosing a driver without checking load: verify the total wattage and the driver’s permitted operating conditions.
Summary and Next Steps
At equal power, a 48V LED strip system draws about half the current of a 24V system, which can reduce voltage drop in the supply cable when conductor resistance is unchanged. That advantage does not establish a universal installation distance or eliminate voltage drop inside the strip. The best choice depends on the exact strip design, total load, cable route, driver, and planned feed points.
Before ordering, calculate the load, map the driver-to-strip distances, and confirm the product’s maximum continuous run and wiring method. At ENTA Lighting, we can help B2B buyers compare indoor LED strip specifications and review project requirements for a suitable 24V or 48V configuration. Share your target length, power requirement, and installation layout to discuss an appropriate product and wiring plan.