Prediction method and system for residual capacity of lead-acid storage battery of direct-current system and medium

The invention discloses a method and system for predicting the residual capacity of a lead-acid storage battery of a direct-current system and a medium. Relates to the technical field of residual capacity prediction. The lead-acid storage battery pack is discharged for the first time in the floating charge operation state, the terminal voltage of each lead-acid storage battery is collected, and the lead-acid storage battery with the minimum capacity is determined; the residual capacity of the lead-acid storage battery is timely and accurately predicted through the first discharge and the second discharge in combination with the residual capacity prediction model, so that a large amount of energy consumption caused by a power-off capacity checking mode is avoided, the storage battery is prevented from being excessively charged and discharged, and the service life of the storage battery is prolonged; according to the scheme, the minimum-capacity lead-acid storage battery is quickly determined based on the termi