“Draw a 480 V community microgrid single-line diagram with a utility PCC breaker, 350 kWdc solar and 300 kW inverter, 750 kWh LFP battery with 300 kW grid-forming PCS, 400 kW generator, and a 250 kW critical-load feeder for a shelter and grocery.”
Read the decisions behind it.
The PCC breaker creates a defined utility-to-microgrid boundary.
A grid-forming PCS supports the 480 V bus during islanded operation.
The solar inverter provides renewable generation to the same bus.
A 400 kW generator supplies extended outage support.
The critical feeder limits island operation to shelter and grocery loads.
Use this architecture for a small resilient microgrid where not every site load must be backed up. Islanding controls and generator paralleling requirements require detailed engineering.
Other examples in this family.
Common questions
What makes the PCS grid-forming?
It can regulate local voltage and frequency when the utility source is absent.
Why include a generator?
It extends operation when an outage lasts longer than battery and solar resources can cover.
Can all loads be backed up?
They can if capacity permits, but a separate critical feeder is often more economical and resilient.