PV Design Pro was critical in my previous line of work as an engineer. I have a BSc in Alternative Energy and this software allows for precise energy production of the pv arrays. This is very critical information to provide for your clients because though in a sales driven environment, you want to ensure that the customer knows exactly what they are paying for. We encounter different roof orientations and weather patterns for various areas and locations, and this software ensures that for the solar panels selected a real life energy,kWh production can be tabulated given the annual conditions, and hence the estimated energy output for the lifetime of the system. With this data another deciding factor the customer can be accurately determined, that is, payback period. So investing in this software for this fast paced industry is a commitment to your customers that you are indeed critical of the information that they are being provided to ensure that their investments are taken seriously. We are currently tendering for solar and prior to this, an internal consultation was undertaken to inform us of what system size (kW) and thus energy output to expect. And this will be used to determine if the company is being offered the best/correct system capacity. I do freelance energy audits and apart of the report includes the implementation of solar at the premises.