The actual solar panels used are almost identical. Generally in the residential solar market you may use a slightly more expensive panel for aesthetic reasons,

The actual solar panels used are almost identical. Generally in the residential solar market you may use a slightly more expensive panel for aesthetic reasons, but the improvement in the underlying solar panel technology in terms of efficiency and cost are available in equal terms to both markets. The inverters used in the residential market versus the solar plant market are usually quiet different and, IMHO, form two distinct markets. Reductions in the inverter cost for solar plant deployments would result in a reduction in the home market, but the relationship is not as direct as the relationship between the panels since you would rarely be able to use the same inverter in both markets.