The critical requirements for the battery are listed below:
 *The battery to be used in the project must be maintenance free deep cycle tubular VRLA Gel Type Battery.
 *Total backup time duration will be minimum twelve hours at 80% DOD
 *The battery Voltage should be compatible with the solar module
 The battery to be used must have passed the test according to IEC 61427-2005
Battery enclosure should be water proof, IP 65, with lockable arrangement.
 *The warrantee period must be at least 2 years.

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