1 Overall (Average) Solar panels cost (from recently updated figures in 2013) ranges between $1750 – $2500 per Kw of installed capacity (average Solar panel cost per kw). 2  This figure includes purchasing the equipment and cost for solar panel installation.ne need to consider that as solar panels costs diminish so is the required scale of financial incentives (e.g. FITS – Feed-In-Tariffs) that aim to make solar energy installations more affordable or financially viable and profitable.