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100 amp 3 phase grow room question!

Z

ZCDelivery

New Member
Hey guys,

So ive been growing for a number of years and the opporunity has risen to start a grow for a collective in an industrial warehouse space. The facility has 120/208v 100 amp 3 phase power and im having a hard time understand how much electricity i will be able to pull from this and what it means to balance over the 3 phases. Ive done some research on the internet and it hasnt been able to solve all my questions so i figured i would post on here and see if i could get any help. Im just trying to get an idea of how many lights i will be able to run with an appropriatly sized ac unit and all other equipment. Thanks!
 
UncleBuck

UncleBuck

Well-Known Member
1000 watts divided by 120 volts = 8.3333 amps

1000 watts divided by 208 volts = 4.8 amps

100 amps divided by 8.3333 amps = 12k of lights



you should only run 80% of your available amperage though, so about 9k of lights.

then like you said, you need AC. not sure about the amperage or the BTUs you would need to cool an operation like that.




if you can't do the rough math on a grow like this, you'll need to bring in qualified help.
 
ttystikk

ttystikk

Well-Known Member
First, is it 100A per leg or across all three?

100A x 208V = 20,800W, but my guess is you'll be able to get more than that.
 
Z

ZCDelivery

New Member
Im not sure if its 100 amp per or across all 3. how would i go about finding it out? do i need to have an electriction come to the building to check it out?
 
SnapsProvolone

SnapsProvolone

Well-Known Member
Depends. Leg to neutral or leg to leg?

Leg to leg its 100 x sqrt of 3

Leg to neutral it's 100 x 3 but most 3 phase transformers only support fraction of their kva through neutral.

You need to know what the neutral on the transformer is rated for if running 120v its the limitation.
 
Z

ZCDelivery

New Member
alright ill have to contact the electricity provider to see if they will be able to tell me what the neutral is rated.
 
SnapsProvolone

SnapsProvolone

Well-Known Member
Often 3 phase is setup to handle a bunch of large motor loads or IT loads. The neutral is provided for lighting and 15% tends to be a number.

So 100 x 3 x 0.15 x 0.8 would be my bet.

EDIT
Forgot leg to neuteal PF of cosine (30), not really an issue if derated neutral though.
 
Last edited:
chuck estevez

chuck estevez

Well-Known Member
most 3 phase panels I have seen can run 40 lights and a/c units no problem, I would do the math, but it's late and I'm loaded.
 
Z

ZCDelivery

New Member
Alright thanks a lot. imma talk to an electrician to make sure but i just wanted to get a rough idea so i knew what i had to work with. Im thinking i do roughly 2 15x20 12k bloom rooms on flip flops and have a 4k veg tent and have maybe 1 1 ton ac per room and a 3 ton ac with a damper for cooling the room with lights on.
 
SnapsProvolone

SnapsProvolone

Well-Known Member
ZCDelivery said:
Alright thanks a lot. imma talk to an electrician to make sure but i just wanted to get a rough idea so i knew what i had to work with. Im thinking i do roughly 2 15x20 12k bloom rooms on flip flops and have a 4k veg tent and have maybe 1 1 ton ac per room and a 3 ton ac with a damper for cooling the room with lights on.
Click to expand...
You just did talk to an electrician. ;)

Your tonnage calcs are underrated imo.

Make sure your AC has a freeze kit. ;)
 
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