840w LED lights 15 amp or 20 amp breaker?

[Lilmink]

I am running four 840w grow lights , will need to install new breakers. Should I put each on a separate breaker? Should I use 15a or 20a?

 

[EvilJ]

I am running four 840w grow lights , will need to install new breakers. Should I put each on a separate breaker? Should I use 15a or 20a?

20 Amps all the way!!! You can never be to safe

 

[ProPheT 216]

15 for each light. They will pull about 7-8 each. You want your breaker to trip early not late if their is a problem

 

[bk78]

I am running four 840w grow lights , will need to install new breakers. Should I put each on a separate breaker? Should I use 15a or 20a?

Youd need a 30, or 2 20’s is my guess without knowing the amp draw on your lights. I run 650w lights and they are 6,3A each

 

[Lilmink]

Youd need a 30, or 2 20’s is my guess without knowing the amp draw on your lights. I run 650w lights and they are 6,3A each

I have a 30 amp dual breaker that isn't being used anywhere. I just wasn't sure if I can put the lights on a 30 amp.

 

[ProPheT 216]

Also know once a breaker trips once from a true overload it never operates at full capacity again. Its only good for about 80% of its rating. It's simply how a breaker works and is designed internally

 

[ProPheT 216]

I have a 30 amp dual breaker that isn't being used anywhere. I just wasn't sure if I can put the lights on a 30 amp.

Sure it's about volts, and can your wall wires handle 30 amps without fire not breaker capabilities

 

[PJ Diaz]

Assuming that your voltage is steady at 120v AC input, you'll be drawing 7 amps per fixture. Personally I'd put 20 amp breakers and run two lamps per circuit.

 

[bk78]

I have a 30 amp dual breaker that isn't being used anywhere. I just wasn't sure if I can put the lights on a 30 amp.

Once again wattage means nothing. The 30 dual should be fine to run the 4 from. You need to kniw the amp draw from your lights for proper calculation.

 

[bk78]

Assuming that your voltage is steady at 120v AC input, you'll be drawing 7 amps per fixture. Personally I'd put 20 amp breakers and run two lamps per circuit.

Yup,I’d do 2 20”s as well in this case.

 

[PJ Diaz]

Also know once a breaker trips once from a true overload it never operates at full capacity again. Its only good for about 80% of its rating. It's simply how a breaker works and is designed internally

I'd like to see a source cited for that theory.

 

[ProPheT 216]

Once again wattage means nothing. The 30 dual should be fine to run the 4 from. You need to kniw the amp draw from your lights for proper calculation.

He's right it will be fine. But if you are stupid and put 30 amps or more thru those wall wires your asking for trouble if they aren't guaged low enough

 

[bk78]

He's right is will be fine. But if you are stupid and put 30 amps or more thru those wall wires your asking for trouble if they aren't guaged low enough

k

 

[ProPheT 216]

I'd like to see a source cited for that theory.

Found out putting breakers in marine boats. Once they trip their are like clips inside that bend. Reseting the breaker pushes them back but dosent fix the curve for real so they trip easier

 

[bk78]

He's right is will be fine. But if you are stupid and put 30 amps or more thru those wall wires your asking for trouble if they aren't guaged low enough

He would obviously need to wire from the box to the grow room right?

 

[PJ Diaz]

Found out putting breakers in marine boats. Once they trip their are like clips inside that bend. Reseting the breaker pushes them back but dosent fix the curve for real so they trip easier

So you can't cite a source for your theory? It's just a theory based on some boat work you did? OK. I don't buy it, sorry.

 

[Lilmink]

Amp draw per light is 6.9, the 30 amp uses a 10 gauge wire.

 

[ProPheT 216]

Well that's assuming he is going to wire. I'm trying to stress that he does and be safe. Not use existing wall wires and put that many amps guessing

 

[bk78]

Amp draw per light is 6.9, the 30 amp uses a 10 gauge wire.

Perfect

 

[Lilmink]

Perfect

27.6 isn't too much for it to handle? Will be great cause this is already wired right next to my room

 

[ProPheT 216]

27.6 isn't too much for it to handle? Will be great cause this is already wired right next to my room

No. Should be fine. Maybe stager your lights so they all don't boot at once