If the current homeowner financed their solar energy system with a loan, in most cases, the loan will always remain the current homeowners responsibility even if the property is sold.  Solar loans vary in terms and conditions and some may be transferrable to a new home buyer, similar to the transfer of a solar lease.  If your client is considering taking over a solar loan, follow the steps outlined above for a solar lease system to ensure you and your client understand the deal thoroughly.
The asking price for the property may reflect the loans held by the previous owner which means in most cases the price of the home also factors in the cost of the originally installed system and the long-term benefits it provides.