Levelised Cost of Storage (LCOS) for solar-PV-powered cooling in the tropics

•Advanced LCOS method to compare electricity and thermal energy storage.•Parametric storage sizing to analyse self-sufficiency and LCOS.•Evaluation of an office, a hotel and a warehouse scenario in Singapore.•Thermal energy storage offers lower LCOS, but achieves low self-sufficiency.•Battery storage needs to be well-sized.