ok interesting, I've got a well at my place in france.......not sure my priority would be to use solar to power the pump for the well.......why not just collect rainwater as stage 1 and then power an electric pump to get water out the well when your rainwater runs dry? I can understand you wanting solar and some new fangled batteries but then you just power the house, pump, etc from the batteries/mains as appropriate......
how much are solar panels over here? in france you get a 400watt panel for about 175 euros, so 2kw of panels is not a lot of dosh nowadays.....and 2kw is loads in my book.....guess it depends how many air con units you need to run though......everything else seems to take naff all power