Independent critical-power microgrid study for a 300-bed hospital, combining 8,760-hour load and grid-availability modelling, HOMER techno-economic optimization, outage-resilience assessment and ETAP time-series load-flow verification for a grid/PV/BESS/diesel architecture.
Engineering Scope
Developed and reviewed an 8,760-hour hospital demand model with 1.20 MW peak demand, 780 kW average demand and a 650 kW critical-load requirement.
Modelled grid availability at 18 hours/day and assessed a defined four-hour outage window against the requirement for uninterrupted critical-load supply.
Evaluated PV capacities up to 1.2 MW, battery storage up to 2.5 MWh and PCS capacity up to 1 MW using HOMER techno-economic optimization.
Compared dispatch strategies and selected the lowest-NPC feasible architecture meeting the critical-load reliability requirement.
Developed the recommended architecture in ETAP, including PV, battery/PCS, grid interface, two diesel generators, critical and non-critical hospital loads.
Reviewed ETAP time-series load-flow behaviour and system operating quantities for the modelled electrical network.
Prepared annual demand, load-duration, monthly demand, monthly energy and outage-availability visualisations to communicate the engineering basis of the study.
Delivery Outcomes
Selected HOMER architecture: 1.2 MW PV, 2.2 MWh nominal battery storage, 704 kW system converter, two 648 kW diesel generators and a 1.2 MW grid connection using cycle-charging dispatch.
HOMER reported zero unmet electric load and zero capacity shortage for the selected configuration.
Reduced modeled net present cost from approximately $14.1 million for the base system to $9.63 million for the proposed system, with LCOE reduced from $0.180/kWh to $0.123/kWh.
Achieved a modeled 30.7% IRR, 3.72-year discounted payback and 3.25-year simple payback under the study assumptions.
Reduced modeled annual diesel consumption from 401,069 litres in the base system to 57,376 litres in the proposed configuration.
ETAP one-line and time-series load-flow modelling provided an electrical-system verification layer for the optimized critical-power architecture.
Technical Areas
6 items
Engineering Drawings
ETAP one-line and time-series load-flow model incorporating PV arrays, PCS and battery system, two diesel generators, grid interface, transformer, and separate critical and non-critical hospital loads.
Sep 2026
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Reports / PDFs
HOMER report covering the selected system architecture, cost summary, electrical balance, PV and battery performance, grid purchases, diesel consumption and economic comparison with the base system.
Sep 2026
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