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| TABLE A |
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| TEMPERATURE EFFECTS ON LIFE | ||
Maximum Annual | Maximum | Percent | |
Average Battery | Battery | Reduction | |
Temperature | Temperature | In Battery Life | |
25°C | (77°F) | 50°C (122°F) | 0% |
30°C | (86°F) | 50°C (122°F) | 30% |
35°C | (95°F) | 50°C (122°F) | 50% |
40°C (104°F) | 50°C (122°F) | 66% | |
45°C (113°F) | 50°C (122°F) | 75% | |
50°C (122°F) | 50°C (122°F) | 83% | |
For example: If a battery has a design life of 20 years at 77°F (25°C), but the actual annual average battery temperature is 95°F (35°C), the projected life of the battery is calculated to be only 10 years.
The battery temperature shall not be allowed to exceed 50°C (122°F). Minimum battery temperature is
5.3Temperature Variations
Sources of heat or cooling directed on portions of the bat- tery can cause temperature variations within the strings resulting in cell voltage differences and eventual compro- mise of battery performance.
Heat sources such as heaters, sunlight or associated equipment can cause such temperature variations. Similarly, air conditioning or outside air vents may cause cell string temperature variations. Every effort should be made to keep temperature variations within 3°C (5°F).
5.4Ventilation
The Absolyte battery is a Valve Regulated Lead Acid (VRLA) low maintenance design. Tests have confirmed that under recommended operating conditions in station- ary applications, 99% or more of gases generated are recombined within the cell. In most cases, no special ventilation and or battery room is required. Consult your local building and fire codes for requirements that may apply to your specific location.
Hydrogen and oxygen gases can be vented to the atmos- phere under certain conditions. Therefore, the battery should never be installed in an
5.5Floor Loading
The floor of the area where the battery system is to be installed should have the capability of supporting the weight of the battery as well as any auxiliary equipment.
The total battery weight will depend on the cell size, num- ber of cells, as well as module configuration involved. Consult layout/wiring diagram for the battery system weight Prior to installation, a determination should be made that the floor integrity is adequate to accommodate the battery system.
5.6Floor Anchoring
Where seismic conditions are anticipated, floor anchoring should be provided. Such anchoring is the responsibility of the user.
Where
Four 9/16” (14.3 mm) holes are provided in the
5.7Connecting Cables:
Battery System to Operating Equipment
The Absolyte cell is a UL recognized component. Battery performance is based on the output at the battery terminals. Therefore, the shortest electrical connections between the battery system and the operating equipment results in maximum total system performance.
DO NOT SELECT CABLE SIZE BASED ON CURRENT CARRYING CAPACITY ONLY. Cable size selection should provide no greater voltage drop between the bat- tery system and operating equipment than necessary. Excess voltage drop will reduce the desired support time of the battery system.
5.7.1Paralleling
Where it is necessary to connect battery strings in paral- lel in order to obtain sufficient load backup time, it is important to minimize the differences in voltage drop between the battery strings in parallel in order to promote equal load sharing upon discharge. Therefore, equal resistance of cable connections for each parallel string is important. When paralleling multiple strings to a load or common bus, please follow these guidelines:
• Each parallel string must have the same number of cells (same string voltage).
• The cables connecting the positive and negative termi- nals of each string to the load (or bus) should be of the same size (i.e. same
• The cables connecting the positive and negative termi- nals of each string to the load (or bus) should be of the same length. Choose the shortest cable length that will connect the battery string that is furthest from the load, and cut all cables used to connect each string to the load
9 to this same length.
