How many 100w halogen off-road lights can I safely run

[Shane Garcia]

Hey everyone, I’ve been running two 100w roadshock halogen lights for a while off a relay and I bought two more too install on a separate relay and I’m just a little concerned that it might be too much does anyone know if this is ok or not?

 

[sbarron]

Depends on your other loads, how big your alternator is, etc...

typically you'll need ~50 amps just for vehicle electronics to run
your 100W lights each pull another 8A so you're at ~65-70A
stereo? how may amps?
another few for fuel pump, as many as 30A for AC

Your amperage disappears pretty quickly. That's probably the biggest advantage to the LED lights.