This Recommended Practice provides design considerations and procedures for storage, location, mounting, ventilation, assembly, and maintaining of lead-acid storage batteries for photovoltaic power systems. Safety precautions and instrumentation considerations are also included. While this document gives general recommended practices, battery manufacturers may provide specific instructions for battery installation and maintenance. This recommended practice is meant to assist lead-acid battery users to property store, install, and maintain lead-acid batteries used in residential, commercial, and industrial photovoltaic systems. Revision Standard - Superseded. Design considerations and procedures for storage, location, mounting, ventilation, assembly, and maintenance of lead-acid storage batteries for terrestrial photovoltaic (PV) power systems are provided. Safety precautions and instrumentation considerations are included. This standard applies to all terrestrial photovoltaic power systems, regardless of size or application, that contain storage subsystems. The installations addressed apply to the operation of an ac, ac/dc, or dc system with the battery, PV generating subsystem, and load all connected in parallel.