To be conservative I would have thrown the filter and fans in as cost of doing business. No resale value on those, the tent you may be able to get $20 out of. So adding 55, 25 and another 25 brings the total to 305 divided by 250 is 1.22. Bet those 'nutes' taste great.
Counted the full cost of the filter as it won't make it though 2 blooms that are that long. Fans will last long enough to calculate though depreciation so only about 10-20% of so $5-10 not 50. The tent will last many cycles so you got to depreciate $55÷lifespan w 3months = like $1
Don't taste the nutes if you flush them right bud taste amazing
To be optimistic. I ph shock her her fist day in bloom probably cost me 10day(cut energy use and depreciation 10%) I put her in bloom early hopping to time her harvest with another plant( didnt work) an extra week in veg would probably boost yeild a good 15-25%.
So let's say this round cost me 1.22/g with a projected future cost $0.66/g
Local street weed is $10/g or I could travel to DC (no thank you) and pay $100/oz( $4/g) so I'm winning either way and having a lot of fun