Sizing Rooftop Photovoltaics and Batteries After Energy Efficiency: An Optimisation Framework for Manufacturing SMEs
Year: 2026
Type: article
Abstract: Small and medium-sized manufacturers are often offered rooftop photovoltaics (PV) as their first decarbonisation step, although cheaper demand-side measures could reduce the supply needed. We develop a modelling and optimisation framework that appraises PV and demand-side measures on common indicators and apply it to a Mexican safety-footwear plant. A tariff model built from official charges reproduces 28 monthly bills with a mean absolute error of 2.2% and values each avoided kWh at 2.64 MXN. Four demand-side measures save 23% of grid electricity at 0.21–1.04 MXN kWh−1. Sizing PV after efficiency reaches the same 54% cut in grid purchases with 94.9 instead of 163.8 kWp and 13% less capital, with a higher net present value in 97% of Monte Carlo draws. An hourly design search cross-checked in EnergyPlus and a linear programme in the open model urbs agree that annual net-zero electricity is profitable, whereas deep hourly self-sufficiency needs batteries that current tariffs do not repay. Under caps on grid emissions, urbs completes the efficiency bundle before adding storage, lowering annualised costs by 29–35%. The advantage is smaller and less certain without the least-evidenced measure, and grows under a time-of-use tariff or if PV loses net-metering demand credit. An open toolkit generalises the framework to other SMEs.
Source: Processes
DOI: 10.3390/pr14223648
Institution: Tecnológico de Monterrey
Language: English
Topic: Smart Grid Energy Management
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,896
OpenAlex ID: W7225806618
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