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Old 06-17-2019, 09:56 AM  
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Default Cannabis Growing Operation

A potential new customer has asked me to help him determine service size required for a new operation. He is brand new to this industry, and so am I.
If anyone can advise as to the typical loads, I have asked him for specs on the hvac and other ventilation, the lighting is SPYDRx PLUS by OSRAM. these are LED with an input power of 660W covering about 15sq feet. to sum it up, is there a basic watts per square foot approximation I could give him?
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Old 06-17-2019, 10:13 AM  
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Why not do the standard service calculations like any other job?
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Old 06-17-2019, 10:24 AM  
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This needs to be engineered. HVAC won’t be going in without detailed drawings and specs so why should you be any different?
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Old 06-17-2019, 10:28 AM  
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Why not do the standard service calculations like any other job?
HVAC could be a big question mark. Electric or gas? I imagine there’s a lot of ventilation. Heating and make up air could play into service size.
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Old 06-17-2019, 10:28 AM  
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There's no way to tell you the "typical loads". Every site is different. Different building size affects HVAC and lighting loads. Different lights affect loads.

You can figure out your power requirements once you have all the HVAC specs for the equipment going in, and once there's an established lighting design/layout.

As others have mentioned, large jobs (such as this) should be engineered.

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Old 06-17-2019, 10:52 AM  
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Originally Posted by LJTL View Post
A potential new customer has asked me to help him determine service size required for a new operation. He is brand new to this industry, and so am I.
If anyone can advise as to the typical loads, I have asked him for specs on the hvac and other ventilation, the lighting is SPYDRx PLUS by OSRAM. these are LED with an input power of 660W covering about 15sq feet. to sum it up, is there a basic watts per square foot approximation I could give him?
25 watts per square meter plus all the equipment at 100%

See 8-210 and table 14


All the lighting is at 100% as it will all be on at the same time. All the other equipment is also at 100%. Heating can follow the demands from section 62.
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Old 06-17-2019, 10:58 AM  
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Thank you everyone, I completely agree, early in the morning I get thinking, but the coffee has not yet set in.. This job NEEDS some engineering. load calculations are what i planned to do, but without loads to calculate...
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Old 06-17-2019, 11:25 AM  
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Marijuana is the Devil's weed.........
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Old 06-17-2019, 11:38 AM  
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Marijuana is the Devil's weed.........
It's also Tim's weed. I have to call Tim.
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Old 06-17-2019, 11:40 AM  
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Marijuana is the Devil's weed.........
It’s also making his minions wealthy. Legally.
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Old 06-17-2019, 11:47 AM  
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POTential work... is ok
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Old 06-17-2019, 12:34 PM  
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As Mac always says,Charge Large. Go big with extras and oversize for future.
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Old 06-17-2019, 02:18 PM  
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the lighting is SPYDRx PLUS by OSRAM. these are LED with an input power of 660W covering about 15sq feet.

Something seems off here.

660W per 15Sq.ft? That's alot of light in a small area.


Not sure how you would cool the place,
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Old 06-18-2019, 08:50 AM  
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Something seems off here.

660W per 15Sq.ft? That's alot of light in a small area.


Not sure how you would cool the place,

Might need more than 660/15 to replicate the sun.
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Old 06-19-2019, 08:29 PM  
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Like the others mentioned, it is a loaded question. Every grow op is different and everyone that grows tends to have a different opinion on what they need.

We've been involved in a few lately so here are a few basics to get you started. These values are conservative and are likely overestimated. Your scenario may be drastically different than the values below:
  • most grow ops use the 1000W MH or LED lights. This works out to be ROUGHLY 30W / sq ft.
  • The grow room lights are on a 12 hours on, 12 hours off cycle.
  • Because of this 50/50 on-off cycle, the distribution is usually in pairs... one panel for every two rooms. The lights are flip-flopped between the two rooms. This reduces the overall average lighting load to around 15W / sq ft.
  • Fans, dehumidifiers, A/C and other general loads account for another ROUGHLY 30W / sq ft

This should give you at least an order-of-magnitude service size. Loads are very high, some of the highest in the industry. 600V is extremely common. Very large operations are starting to use 4160V.

Cooling with large volumes of outdoor air is a bad idea. There is lots of opportunity for cross-contamination, spores and other things that spoil crops. Good operations use A/C and dehumidification in sealed rooms.

Good luck!
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Old 06-19-2019, 11:10 PM  
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Great info... cycling loads between rooms is obvious but i didn't even consider it! Thanks 908
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