This kit, (panels, inverter, isolator switch, meter, wire, connectors, roof mounting brackets costing £2500 (about $3000 US)) was purchased off Ebay.

I expect generation of about £500 worth of electricity through the year - even here in England - so for a £2500 investment that's a 20% ROI - for approximately 20 years. Not bad at all.

Not the best video but I learned a lot - not least that it's not a particularly difficult job - and hopefully there are some tips for DIYers. The more solar the better!