What configuration allows shore power sources to operate with onboard power sources?

The configuration that allows shore power sources to operate concurrently with onboard power sources is parallel configuration. When power sources are connected in parallel, they can share the load and provide electricity to the onboard systems simultaneously. This setup is particularly advantageous because it enables the vessel to utilize shore power when available, while also having the onboard generators or batteries capable of taking over when shore power is not present.

In a parallel configuration, the voltage remains the same across each power source, ensuring that both the shore power and the onboard power systems can work together without any issues. This is optimal for ensuring consistent power supply and operational reliability, especially during extended periods in port or when the onboard power systems are unable to meet the demand alone.

Other configurations, such as serial, do not allow for the simultaneous operation of multiple power sources in the context of typical marine electrical systems. Isolated and independent configurations suggest that power sources are separate from each other, which would not enable their cooperative operation, a necessary feature for switching between power sources as conditions change.