Just wandering who has had the most energy efficient grow. A while back I tried 4 plants under 3 x 58watt 60" (before the days of Envirolight) aquarium lights and managed a meager yield of around 120g (4 ounces?). I had a bad space with lots of light leakage, just in soil and a painfully long growth period (about 5 months from wetting the deeds).
My dates and times are a bit sketchy to give an accurate figure but a g/Kwh figure is easy and gives you a really good idea on how well a growroom is working in terms of it's main power usage (not including pumps, monitoring equipment or anything else)
So say I vegged for 2.5 months and flowered for the same and produced 120g dry weight.
(Wattage x Hours Used Per Day) / 1000 = Daily Kilowatt-hour (kWh) consumption
(1 kilowatt (kW) = 1,000 Watts)
Veg: 174Watts of lights, 24 hours a day.
(174 x 24) / 1000 = 4.176Kwh per day
2.5 months =(ish) 76days.
4.176Kwh x 76 days = 317.376Kwh used.
Flowering: (174 X 12) / 1000 = 2.088Kwh per day
2.088Kwh x 76 days = 158.688Kwh used.
Add those together for total power used and divide by dry yield in grams:
(317.376 + 158.6 / 120 = 3.9672 Kwh/g
So each one gram joint cost me 3.9672Kwh and about 48p in electricity. If thats a bench mark then someone should be able to beat it. I've heard as high as 10 Kwh/g is possible but never seen one.
The search continues...
My dates and times are a bit sketchy to give an accurate figure but a g/Kwh figure is easy and gives you a really good idea on how well a growroom is working in terms of it's main power usage (not including pumps, monitoring equipment or anything else)
So say I vegged for 2.5 months and flowered for the same and produced 120g dry weight.
(Wattage x Hours Used Per Day) / 1000 = Daily Kilowatt-hour (kWh) consumption
(1 kilowatt (kW) = 1,000 Watts)
Veg: 174Watts of lights, 24 hours a day.
(174 x 24) / 1000 = 4.176Kwh per day
2.5 months =(ish) 76days.
4.176Kwh x 76 days = 317.376Kwh used.
Flowering: (174 X 12) / 1000 = 2.088Kwh per day
2.088Kwh x 76 days = 158.688Kwh used.
Add those together for total power used and divide by dry yield in grams:
(317.376 + 158.6 / 120 = 3.9672 Kwh/g
So each one gram joint cost me 3.9672Kwh and about 48p in electricity. If thats a bench mark then someone should be able to beat it. I've heard as high as 10 Kwh/g is possible but never seen one.
The search continues...