Need to also take into account that currently there are moves my some distribution companies to try and make people who have solar pay a higher network cost.
Their argument is that people with grid connect solar are making prices higher for everyone else so need to pay mo I am not going to get into this here, suffice to say I work in the industry and their argument is rather flawede.
Westy is right though, check what the FIT is in their area and also what their usage is now via their last couple of bills. This should help calculate what system will be best.
Anything under 20c per kwh will mean they will most likely pay a bill still but it will be very small.
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