Best answer: What size relay do I need for LED light bar?

Do you need a relay for LED light bar?

A relay is an electrical switch that lets a low current circuit control a high current circuit such as a large LED light bar. … If you are using a light pod that does not have a very large amp draw, you may not need a relay switch, but if you are using a larger LED light bar, they are a must have.

How many amps does a LED light bar use?

55W LED lights are usually in 4-5 amp range. You can also use a high current meter.

What size fuse do I need for LED light bar?

A 10 amp fuse will protect the circuit. The 16 gauge wire will handle 10 amps in the length of wire that you will be using. The switch is rated for 20 amps. So, the 10 amp fuse will protect the circuit from overload.

What size relay do I need?

An easy way to determine the limit of a relay is to multiply the rated Volts times the rated Amps. This will give you the total watts a relay can switch. Every relay will have two ratings: AC and DC. You should determine the AC watts and the DC watts, and never exceed these ratings.

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Why do you need a relay for LED lights?

Relays can be used to switch a low-current trigger to high current, switch a circuit on or off, reverse polarity, and much more. When adding LED lights, such as off-road light bars, driving/work lights, or other auxiliary lights to a vehicle, you must add a circuit to power the light adequately.

Why do LED lights have 3 wires?

LED Lights with 3 wires will be a multi-function light. They can (most times) be used in whatever configuration is right for your application. For example, running and brake, running and blinker or brake and blinker. These LED’s will usually have a black, red and white wire.

What is a good wattage for a LED light bar?

Lumens vs Watts, which is more important?

Lighting Type Watts Efficiency
Incandescent Bulb 60 Poor
CFL 14 Good
6″ LED bar 36 Excellent

Do LED lights draw less amps?

You’ll find out why LED lights draw less from your battery while providing the same amount – or even more — light than the old incandescent ones. … When Dave connects incandescent bulbs to an amp meter, they draw up to 1.6 amps, but when LED lights are used, they only pull about . 26 amps.

How many amps does a 300 watt LED light draw?

how many amps does this 300w led pull? probably around two two or three.

Do LED light bars draw a lot of power?

A true 120W LED bar would be brighter than the brightest set of car high beams. … LEDs use about one-fifth the power for the same amount of light output. So for your light bar, it would consume one-fifth of the current, i.e. 0.2 amps from a 120 VAC source, or 2 amps from the car battery.

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How do you size a 12v fuse?

Easy Way

  1. Find the continuous amperage of the device you are trying to power and multiply that number by 1.5, then round up to the nearest fuse size you can find.
  2. Cross check that fuse size with the maximum fuse size chart below and verify that your fuse size is below the maximum fuse size listed in the chart.

How do you know what size fuse to use?

B Calculate MINIMUM FUSE AMPERAGE by multiplying product amperage rating by 125%. Minimum fuse amperage provides more protection for the wire but may result in nuisance blows. Example: 80A x 125% = 100A. C Choose FUSE AMPERAGE near the middle of this range.

Does a relay need to be grounded?

When hot switching voltages above the coil to case dielectric voltage rating, the relay MUST be on the ground side of the load (see Fig. 2) and the case MUST be grounded. For hot switching voltages lower than the coil to case dielectric voltage rating, the relay can be on either side of the load (see Fig.

Why use a relay instead of a switch?

One of the most common situations that require the use of a relay occurs when an application needs to switch from high to low current (or vice versa) within the same circuit. For example, the temperature sensors that power HVAC units require levels of amperage that vastly exceed the capacity of their wiring.

Will a horn work without a relay?

You can run that horn without a relay, but be prepared to listen to it wail uncontrollably until the wiring catches fire or the battery dies.

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