Here's the basic math of how to get what growers call "gram per watt".
This is a simple math equation, but you need to follow through. To begin, we'll use some example typical samples that small indoor growers use (along with the assumption the grower got 500 grams, dried at harvest):
- 138w of CFL for veg (6 x 23w) @ 18/6 schedule for 2 weeks
- 600w of HPS for flower @ 12/12 schedule for 70 days
- 500g dried product
...now follow along, replacing your reality with the example numbers:
Veg cycle:
138w / 1000 = 0.14 kW/h
0.14 kWh x 18 hours per day = 2.5 kW per day
2.5 kW per day x 14 day veg cycle = 35 kWh per veg cycle
Flower cycle:
600w / 1000 = 0.6 kW/h
0.6 x 12 hours per day = 7.2 kW per day
7.2 kW per day x 70 day flower cycle = 504 kW per flower cycle
Total:
35 kWh (veg) + 504 kWh (flower) = 539 kWh per entire cycle
500 grams dried / 539 kWh = 0.93 grams per kWh
Based on the above calculation, a grower who dried 500g (always divide your ounces into grams for this math) would have achieved a ratio of 0.93 grams (just under one gram) per watt.
Note: experts calculate in their fans, A/C, (de)humidifier(s), pumps, and a huge wide range of other equipment into the mix, but at a basic level, you now get the idea.
-spek
ps. feedback, criticism and corrections welcome.
This is a simple math equation, but you need to follow through. To begin, we'll use some example typical samples that small indoor growers use (along with the assumption the grower got 500 grams, dried at harvest):
- 138w of CFL for veg (6 x 23w) @ 18/6 schedule for 2 weeks
- 600w of HPS for flower @ 12/12 schedule for 70 days
- 500g dried product
...now follow along, replacing your reality with the example numbers:
Veg cycle:
138w / 1000 = 0.14 kW/h
0.14 kWh x 18 hours per day = 2.5 kW per day
2.5 kW per day x 14 day veg cycle = 35 kWh per veg cycle
Flower cycle:
600w / 1000 = 0.6 kW/h
0.6 x 12 hours per day = 7.2 kW per day
7.2 kW per day x 70 day flower cycle = 504 kW per flower cycle
Total:
35 kWh (veg) + 504 kWh (flower) = 539 kWh per entire cycle
500 grams dried / 539 kWh = 0.93 grams per kWh
Based on the above calculation, a grower who dried 500g (always divide your ounces into grams for this math) would have achieved a ratio of 0.93 grams (just under one gram) per watt.
Note: experts calculate in their fans, A/C, (de)humidifier(s), pumps, and a huge wide range of other equipment into the mix, but at a basic level, you now get the idea.
-spek
ps. feedback, criticism and corrections welcome.
