Wiki

Battery Bank

The Battery Bank is the DC Bus buffer and the lowest priority for both supply and consumption. It is a 5-tier upgrade path, not multiple banks. Lead-Acid is starting equipment. Higher tiers follow the Battery Type research ladder (tier index N requires Battery Type level N).

Routing role

  1. DC Bus power not consumed by other means (primarily the inverter) charges the battery up to capacity and Depth of Discharge (DoD) limits.
  2. DC Bus demand not met by generation charges down from the battery to its discharge limit.
  3. Battery efficiency applies to both charge and discharge: it slows charge rate per unit consumed and raises discharge draw per unit requested.

DC Bus voltage loss applies to battery charge and discharge.

Degradation

  • Discharge_value = 100 − DoD
  • Track discharge percentage; accumulate +1 discharge_count per Discharge_value discharged
  • Track cycle_count
  • When cycle_count >= battery.cycles: capacity multiplier × 0.8
  • Capacity starts at 1.0; degrades linearly toward 0.8 based on cycle_count
  • Charging below DoD% adds a 5 cycle_count penalty at DoD%, then again for every 10% below
  • Battery effectiveness floor: 50% at 2× cycles; linear scale from 0.8 to 0.5 when cycle_count > cycles

See Degradation and maintenance.

The power-flow bar shows Battery Input, Battery Stored (kWh of kWh Total, 1 decimal place), and Battery Output. Off-Grid Legend asks the player to keep the battery above 80% for 7 days.

See also