Hybrid microgrids with wind, solar and batteries

Wind, solar and batteries can serve distinct roles in a microgrid. The engineering question is how the sources behave together during the hours that determine resilience and cost. Begin with the loads that must stay online and the duration of the outage the system is expected to withstand.

Separate storage power from energy

Battery power, in kW, constrains how much load the inverter can serve at a moment. Usable battery energy, in kWh, constrains how long it can serve that load. Allow for the minimum state of charge, conversion losses, temperature limits and aging. Check short peaks and starting currents as well as sustained demand. Define whether the system must start without the grid and which loads can be shed.

Test dispatch and failure modes

Simulate the controller across representative seasons and outages. Specify when storage charges, what triggers backup generation, and how the system handles curtailed output, communications loss or a failed component. Compare fuel, unmet critical load, battery throughput and service visits. Ask suppliers to demonstrate source handover, alarms and recovery under a witnessed acceptance test.

Continue with Wind or solar for remote infrastructure and Small wind for telecom. Source: U.S. Department of Energy, Microgrid System Project Development Checklist.