IEEE 937-2000 pdf download IEEE Recommended Practice for Installation and Maintenance of Lead-Acid Batteries for Photovoltaic (PV) Systems
3. Definitions
The following definitions apply specifically to this recommended practice. For other definitions, seeThe IEEE Standards Dictionary of Electrical and Electronics Terms (B6].2
3.1 capacity (C): Generally, the total number of ampere-hours that can be withdrawn from a fully chargedbattery at a specific discharge rate and electrolyte temperature, and to a specific cutoff voltage
3.2 dry-charged cell: A cell that does not contain electrolyte for ease in shipping or storage, or both
3.3 equalizing voltage: The voltage, higher than float, applied to a battery to correct inequalities among bat-tery cells (voltage or specific gravity) that may develop in service.
3.4 freshening charge: The charging of batteries to assure that they are maintained “fresh”in a nearmaximum state of charge, and to assure that there is no deterioration of the battery plates due to selfdischarge and resulting sulfation. Freshening charges are usually performed using the manufacturer’srecommended equalization or cycle-service charging voltage.
3.5 life: The period during which a fully charged battery is capable of delivering at least a specifiedpercentage of its capacity, generally 80%.
3.6 pilot cell(s): One or more cells chosen for monitoring the operating parameters, e.g., cell voltage.
specific gravity and temperature, of the entire battery.
3.7 valve-regulated lead-acid cell (VRLA): A lead-acid cell that is sealed, with the exception of a valvethat opens to the atmosphere when the internal gas pressure in the cell exceeds the atmospheric pressure by apreselected amount. Valve-regulated cells provide a means for recombination of internally generated oxygenand the suppression of hydrogen gas evolution to limit water consumption.
3.8 vented cell: A cell in hich the products of electrolysis and evaporation are allowed to escape to theatmosphere as they are generated. These batteries are commonly referred to as “flooded”
4. Safety
The safety practices listed herein should be followed during battery installation and maintenance. Work per-formed on batteries shall be done with the proper tools and protective equipment. Battery installation shallbe performed or supervised by personnel knowledgeable of batteries and the required safety precautionsKeep unauthorized personnel away from batteries.
4.1 Protective equipment
The following equipment is recommended for safer handling of lead-acid batteries and protection ofpersonnel;
a) Full eye protection, such as goggles or a face shield.
b) Protective clothing, including acid-resistant gloves, aprons, and overshoes.
c) Portable or stationary safety shower and eye-wash stations.
d) A suitable acid-neutralizing agent, such as bicarbonate of soda (baking soda).
e) A lifting device of adequate capacity.
IEEE 937-2000 pdf download
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