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The possibilities to involve small-scale prosumers for ancillary services inthe distribution grid through aggregators and local flexibility marketsquestion whether it is profitable for prosumers to oversize proactively. Inthis analysis, a Python model is developed to identify the cost-optimaloperation plan of the PV-battery system and to evaluate the device flexibility.An economic assessment is carried out to derive the cost-benefit of sizingbased on the mean electricity price. A sensitivity analysis is performed withthe above results to study the profitable sizing of PV-battery systems withflexibility services. The results show a promising advantage of oversizingalthough limitations prevail with the extent of flexibility services offered.

Does Oversizing Improve Prosumer Profitability in a Flexibility Market? -- A Sensitivity Analysis using PV-battery System