Under the Cycle Charging strategy, whenever a generator is required, it operates at full capacity, and surplus power charges the battery bank. Cycle charging tends to be optimal in systems with little or no renewable power. Cycle charging is abbreviated "CC" in the tables on the Results page.
On the Controller page, check the Apply Setpoint State of Charge (%): box if this is an option for the cycle charging strategy. The generators do not stop charging the battery bank until it reaches the specified state of charge. The sensitivity button to the right allows you to do a sensitivity analysis on this setpoint.
Check the "Allow diesel-off operation" box if the system can maintain stability without the generator running. This option only has an effect if there is a generator in the system that can sometimes be turned off. Some systems require a generator to maintain bus voltage and frequency. If the system includes a "grid-forming" component other than the generator, you can deselect this option. HOMER then turns the generator off if the load can be supplied with other sources.
Checking the "Allow generators to operate simultaneously" box only affects the operation of systems that include two or more generators on the same bus. If you check this box, HOMER allows multiple generators on the same bus to operate at the same time whenever necessary. Otherwise, multiple generators on the same bus operate one at a time.