Mine was pretty solid 250 a month...
3000w in flower (12hr), 2 8bulb t5 for veg (18hr), 2 air bubbler (24hr), blue lab guardian(24hr), 3 small fans(18hr), 2 6" inline fans(18hr), 1 12site ebb n flow with pumps ect. (4 times a day), industrial size ac (12hr on an off)
I think thats about mine BUT i also run a garage of equipment like lift and welder every so often.