We are a family of 2 adults and toddler, running 5x 26Deg tanks.. We have a lot of our office comps and equip on for long hours so I think thats where our greatest usage is (oh and the lovely showers hehe).
Our last power bill was $260 and it doesn't increase much for winter, we have super insulation and positioning for maximum sun exposure.
The increase in power bills comes more from them ramping up the prices rather than us using more electricity :-?