Can I put in a grid-tied solar system larger than my usage?
In Alberta there is something called the Micro-Generation Regulation. This regulation is intended for small scale home owners, small businesses, municipal and community buildings to become self sufficient. It states that a PV system is intended to meet all or a portion of a customers electricity needs. Normally this means using the last year of electrical consumption (from the bill) however a system may also be sized with an anticipated load. If an individual is looking to purchase a hot tub or AC unit or even an electric car, this can be accounted for and offset with solar PV.
While they can be more difficult to get approved, systems that produce more than the home consumes can have a larger affect on the electrical bill.