Gpw average???

Shugglet

Well-Known Member
g/sqft divided by g/w yields units of watts per sqft... how does that metric relate to efficiency.

30 g/ 1 sqft divided by 1.5 g/ 1 watt gives 20watts per square foot. i dont really follow.

metrics that describe an "efficiency" of something are typically unit-less. to be expressed as a ratio.
Yep looks like I was wrong. I guess the two just need to be looked at separately. Thanks for checking, maybe Ill look more into it or something similar in the future.
 

Shugglet

Well-Known Member
I agree G/KwH is a better metric, but it can pretty easily be deduced from G/W assuming you have times logged.

Case in point:
gpw is a misnomer

a person could throw clones in and run them for 8 weeks under 1000W and get say X grams
a person could veg for 8 weeks under 500W@24 hrs and flower them for 8 more weeks under 1000W and get 1.5X grams

which was the better deal?
Depends on how you describe "better deal".

Person "A" used one unit of electricity for 1 unit of product.

Person "B" used twice the electricity for 1.5units of product.

Does the extra .5 units of product value outweigh the cost of 2x the electricity? If so, they come out ahead.
 
Last edited:

Greengenes707

Well-Known Member
No need for g/w ever.

(power in Kw...1000w=1Kw) x (hours a day used) x (days used) = KwH

EX for 1500w over a 60 day flower.
1.5Kw x 12hrs x 60days=1080KwH

EX for 600w veg for 30days and 1500w flower for 60 days
(0.6Kw x 18hrs x 30days) + (1.5Kw x 12hrs x 60days) = 324+1080 = 1404KwH's

And if you fluctuate/dim/raise wattage through out the cycles, it can all be calculated.
 

Shugglet

Well-Known Member
No need for g/w ever.

(power in Kw...1000w=1Kw) x (hours a day used) x (days used) = KwH

EX for 1500w over a 60 day flower.
1.5Kw x 12hrs x 60days=1080KwH

EX for 600w veg for 30days and 1500w flower for 60 days
(0.6Kw x 18hrs x 30days) + (1.5Kw x 12hrs x 60days) = 324+1080 = 1404KwH's

And if you fluctuate/dim/raise wattage through out the cycles, it can all be calculated.
I agree, but the fact is, the vast majority of people probably dont know how many KwH's they used for their grow or care to calculate it for that matter, but they could answer in their sleep how many watts of lights they are running. And I believe thats about how far most care to think into it.
 

doz

Well-Known Member
I agree, but the fact is, the vast majority of people probably dont know how many KwH's they used for their grow or care to calculate it for that matter, but they could answer in their sleep how many watts of lights they are running. And I believe thats about how far most care to think into it.
Because KWH are tough to calculate..... While I do not know off hand, would take me all of 10 seconds to figure it out.
 

jeepster1993

Well-Known Member
250 watts ran for 12 hours for 60 days and 18 hours for 60 days. A kilowatthour costs here 11.05 cents
About $30 to veg. 270 kilowatt hours.
About $21.50 to flower. 180 kilowatt hours.
$51.50 for 300 grams
Is that it?
I prefer the grams per watt number
 

doz

Well-Known Member
250 watts ran for 12 hours for 60 days and 18 hours for 60 days. A kilowatthour costs here 11.05 cents
About $30 to veg. 270 kilowatt hours.
About $21.50 to flower. 180 kilowatt hours.
$51.50 for 300 grams
Is that it?
I prefer the grams per watt number
Why? Because it is inaccurate? Because GPW has too many variables?
 

sixstring2112

Well-Known Member
I like the kwh idea but are we supposed to just add our lights to those calcs or do we try to figure everything like fans, air pumps ,hvac, scrubbers,ect ?
Ima need a calculator sonz lol.
Pretty easy for me to just look at my power bill and deduct the 80 bucks a month i used to pay before i started growing . Then add up the oz moved over that time frame. I never liked gpw because unless we all use the same light and space its kinda worthless imo.
 

Shugglet

Well-Known Member
No, because it is a standard measure.
Widely used, accurate or not, it is the measure used to judge amount.
Why would you use it to judge something if it isnt accurate?

This is why I love this planet. Who gives a shit about accuracy. Im all about that G. P. W. Baaaaaby!!!!!

Honestly, g/w is the equivalent of an e-peen. I say wave it around to your hearts content, everyone else is...
 

jeepster1993

Well-Known Member
Grams per watt is a poor way to judge a grow.
But not such a bad way to judge a harvest.

My numbers for the last grow.
450Kwh of light
297 grams of bud
.66 grams per kilowatthour.
Is that good? Is that bad? Average?

In grams of harvest per watt I kind of know.
 

sixstring2112

Well-Known Member
Grams per watt is a poor way to judge a grow.
But not such a bad way to judge a harvest.

My numbers for the last grow.
450Kwh of light
297 grams of bud
.66 grams per kilowatthour.
Is that good? Is that bad? Average?

In grams of harvest per watt I kind of know.
We have no idea lol.
 

doz

Well-Known Member
Grams per watt is a poor way to judge a grow.
But not such a bad way to judge a harvest.

My numbers for the last grow.
450Kwh of light
297 grams of bud
.66 grams per kilowatthour.
Is that good? Is that bad? Average?

In grams of harvest per watt I kind of know.
If you used HPS is sounds pretty decent. LED, not so much.
 

skorchem

Well-Known Member
The way I understand it, is that plants can only absorb so much light to a point after which the excess light becomes detrimental.
Finding this right balance requires that you at least know the bare minimum of light needed to maximise the plant's potential, using panda film over mylar or flat paint will help with this.

I run my 3590s at 1400, roughly 50 watts each. Might not sound like much but when you have eight of them in a square metre pattern they need to be damn high up.
I chopped a bud off by mistake and left it there next to my plant and it dried out with zero chlorophyll, pure golden yellow like summer hay and that only took two weeks to do that.

So these new cobs especially Cree are the dogs danglies and any naysayers can get te fuck!
 

Abiqua

Well-Known Member
Eliminate as many variables as possible. grams per watt is a marketing term. It is arbitrary.......Don't confuse it as science or even due diligence. . .
 
Top