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.
Do I need a relay?
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.
What is the purpose of a relay on lights?
Using a relay keeps the high current portion of the circuit away from the switch and pulls the current directly from the battery to your KC’s. The relay also allows you to tie your lights into a secondary 12-volt circuit such as your high/low beams or ignition.
How many amps does my LED light bar draw?
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.
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.
Can you put a relay in backwards?
Relays can’t be inserted backwards. The ones you can put in two ways, will work either way.
When would you use a 12v relay?
Relays are often used in circuits to reduce the current that flows through the primary control switch. A relatively low amperage switch, timer, or sensor can be used to turn a much higher capacity relay on and off. Another primary use for relays is when upgrading to halogen headlights on an older car.
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.
Do I need a relay for fog lights?
Relays are an important component in wiring fog or driving lights with a 30-60A draw. Basically, the relay protects the switch from getting hot and creating unwanted resistance. The low current through the switch triggers the relay to make a higher current connection to the heavy load of the fog lights.
What does a 12 volt relay do?
12V DC relay switches are the best solution for full voltage applications, as they allow a low current flow circuit to control a high current flow circuit, like a vehicle’s horn, headlights, auxiliary lamps, fan motors, blower motors and countless pieces of equipment existing on vehicles today. How is a relay designed?
How many amps does a 50 inch LED light bar draw?
20A@12V,9A@24V LED Current Draw. 18000 Lumens to light up the night.
How many amps does a 300 watt LED light draw?
how many amps does this 300w led pull? probably around two two or three.
How many amps does a 72 watt LED light bar draw?
(A=W/V). So if you know the watts of the lights, you can easily calculate amps. For example, a 55W light would draw 4.58 (55/12) amps.
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.
How many watts can a 5 amp fuse take?
|45 AMP||For circuits of more than 13kw (13000 w)|
|13 AMP||For appliances between 700 and 3000w (3kw)|
|5 AMP||For lighting circuits. The maximum permissible load of a lighting circuit is 1200w or 12* 100 watt lamps|
|3 AMP||For appliances up to 700 watts, such as table lamps and alarm clocks|
How do you size a 12v fuse?
- 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.
- 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.