[quote name='bassbloke' post='432104' date='Mar 12 2009, 07:40 AM']Has he shown you the bill? £650 for 3711 units works out at 17p a unit. That's incredibly expensive even for a domestic tariff. My home tariff is around 9p per peak unit and my work pays 7p per minute for peak use.
If you want to calculate usage for yourself it's quite easy
add up total watts used
so 400W for Mesa, 80 or 100 or whatever each for the powerballs, 750 for the power amp and I reckon factor in another 150W for sundries (brain, etc...) I'd assume your dehumidifer is around 250W
(400+80+80+750+150+250)/1000 gives you the total in Kw/h
# of hours * units * cost per unit tells you what you should be paying[/quote]
If it's in a mill or similar building it's generally on industrial power or something of a similar name which is more expensive mine is 14p a unit.