Battery backup system

[ewbuck2004]

Our company operates 8 trunking site in the state. There are battery backups at every site. The systems consist of two Astro RS-70a power supplies, four deep cycle batteries connected in parallel and 3-5 trunking repeaters. All are connected together. Sometimes at certain sites all the repeaters will tx at the same time. The rf power amps are 100watts and draw approximetly 40amps each when tx'ing, then you add the standby current of the receivers. Once in awhile the ac power goes out and the batteries operate the radios. My question is, in this configuration, will the batteries ever receive a full charge? Or will they continually cook the batteries. I am working on setting up a maintenance schedule for the batteries at our sites and this information is greatly appreciated.
In this configuration there is no way to disconnect the batteries from the system when AC is restored so the batteries can receive a controlled voltage charge. All are connected and working at the same time.
Ed

 

[Raccon]

If the batteries ever receive a full charge depends on the time between failure of the AC mains and if that period is enough to fully charge them. The charging time depends on the power system design and the batteries (amount, type etc.).
It is possible that the batteries get drained to a point where they will be damaged, unless the power system is equipped with a low-voltage disconnect switch (LVDS).