Patent ID: 7400149
Filing Date: 2008-07-15
Classification: G01R

Abstract:
1. A method for assessment of a state of batteries in battery-supported power supply systems having at least two parallel battery paths, which alternately supply a load with power or are recharged from a generator depending on the state of charge, comprising: after disconnection from the power supply system, automatically recording a discharge characteristic of a no-load voltage by means of a control unit across a discharge resistance during a stage-by-stage discharge cycle from a charged battery which is being operated for a first time on the power supply system; repeating the stage-by-stage discharge cycle at times which can be defined to record an instantaneous discharge characteristic of the no-load voltage; and determining an alarm no-load voltage from the instantaneous discharge characteristic of the no-load voltage from a previously defined reserve time and from a final discharge voltage as determined in the first measurement, which alarm no-load voltage represents a measure of energy which remains in the battery, and on reaching which during operation on the load, an alarm is produced for an operator of the power supply system, wherein instantaneous discharge characteristics of the no-load voltage during recharging by photovoltaic systems are recorded in a time window, which can be defined, in the area of sufficiently high solar radiation.