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zolar · 07-05-2008, 04:54 PM

the .71 may be per 100,000 kwh not per kwh

don't know with out seeing electric bill easy rule of thumb check old summer bill with AC on 24/7 if ac eats 1000 watts or better and you compare with spring month with few electric
heaters you'll have idea on what a grow using 1000-1500 watts
24/7 will cost

you might be more costeffective to use two[2] 400's in there both for costs and for better light penetration i'm great lakes area and my system [400] might be 20$ added a month haven't checked bills any how since i got HID light i changed out
most bulbs in the house for cfl's helped a little to keep power load fairly even last i compared bills couple months ago

easy electric guide look at power consumption plate in specs or on back of tv's computers freezers etc and lookat energy rating

bill change from a 475 watt freezer is about equal to a 400 HID plus vent fans
same goes for 1500 watt AC vs 1000 watt HID with venting

not science class acceptable but a good predictable economic guess/theory

any time you see cost estimates for freezers or AC if wattage is close to a grow light size you have approximate estimate on cost during 24 day cycles
during budding time day cycle is half so cost is less....

a watt is a watt is a watt....

07-05-2008, 04:54 PM	#12
zolar Free Thinker Join Date: Mar 2006 Location: lake erie - landside Posts: 483	Re: Kilowatt hour cost the .71 may be per 100,000 kwh not per kwh don't know with out seeing electric bill easy rule of thumb check old summer bill with AC on 24/7 if ac eats 1000 watts or better and you compare with spring month with few electric heaters you'll have idea on what a grow using 1000-1500 watts 24/7 will cost you might be more costeffective to use two[2] 400's in there both for costs and for better light penetration i'm great lakes area and my system [400] might be 20$ added a month haven't checked bills any how since i got HID light i changed out most bulbs in the house for cfl's helped a little to keep power load fairly even last i compared bills couple months ago easy electric guide look at power consumption plate in specs or on back of tv's computers freezers etc and lookat energy rating bill change from a 475 watt freezer is about equal to a 400 HID plus vent fans same goes for 1500 watt AC vs 1000 watt HID with venting not science class acceptable but a good predictable economic guess/theory any time you see cost estimates for freezers or AC if wattage is close to a grow light size you have approximate estimate on cost during 24 day cycles during budding time day cycle is half so cost is less.... a watt is a watt is a watt....