| 摘要 |
PROBLEM TO BE SOLVED: To reduce loss in discharging by causing a discharge current to flow into a load from a sealed battery at each set period, and comparing the lowering of the voltage of the sealed battery as against the unit current time product of the discharge current with a reference value. SOLUTION: A timer circuit 11 for setting the detection period of this apparatus outputs a starting command to a command to a timer circuit 12 and a compactor 14, when a set long time passes and the time is up. Incidentally, the timer circuit 12 is being set to a comparatively short time, and in counting, a current flowing into an inverter 5 from a battery 7 is detected by a current detector 17, and the voltage of the battery 7 is detected by a voltage detector 13, and both detected signals are inputted to a comparator 14. The lowered value of the detected voltage signal to a unit current time product obtained by multiplying the detected current signal by a period is sampled, and compared with a reference value of a reference value outputting circuit 15. An alarm is displayed on an alarm display 16, when the lowering of the battery voltage has become larger than the reference value. Consequently, it becomes possible to exchange the battery surely, when it reaches an appropriate life lowered state. |
