Recharge time

DOE-SPEC-3018-96

ATTENTION:

Include the following only if a battery charger is required (not necessary for UPS applications.) Enter the desired

length of the recharge time following a discharge in paragraph 3.2.5, below. Note that two different discharges are

specified. One is based on the normal system load profile specified in Appendix B, the other one is based on a

deep discharge resulting from a capacity test. Enter the system recharge voltage as well as the normal load

current. This information is required so that the battery vendor can provide data for the recommended battery

charger. The normal recharge time for a reasonable size charger is 1.5 to 2.0 times the discharge time.

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3.2.5

Recharge time. The desired recharge time to 95% rated capacity is [72]

[ ] hours following a discharge based upon the duty cycle, and [72] [ ] hours

following a performance-test discharge in accordance with IEEE 450. Charging

shall be accomplished at [2.33] [ ] V per cell. [Normal DC-system load current

is [ ] A exclusive of charging current.]

ATTENTION:

Select the appropriate method: the constant current method is appropriate for general purpose; the kilowatt

method should be used for UPS.

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3.2.6

Battery sizing. The following additional sizing factors for the specified service

conditions shall be based on the [constant current method in accordance with

IEEE 485.] [kilowatt method.]

ATTENTION:

Supply the appropriate factors below. The temperature correction factor is obtained from IEEE 450. This number

ensures that the battery has sufficient capability at the coldest expected temperature. Do not use a correction

factor of less than 1.0. The design margin factor for general purpose is normally 1.10 to 1.15 to allow for future

system growth. The design margin factor for UPS application is normally 1.0 based on the assumption that the

UPS cannot be loaded by more than 100%. The normal aging factor for either application is 1.25, which is

consistent with retiring the battery when the battery can no longer supply above 80% of rated capacity. For pure

lead cells, aging factor is 1.0 since these cells maintain 100% (or better) capacity over their design life.

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a. Temperature correction factor of [1.0] [

]

b. Design margin factor of [1.10] [

] in accordance with IEEE 485

c. Aging factor of [1.25] [

ATTENTION:

Consult with the onsite structural engineer and DOE natural phenomena protection standards regarding seismic

requirements for the specific site. Revise or delete all of paragraph 3.2.7 as necessary.

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3.2.7

Seismic requirements.

3.2.7.1

Seismic qualifications.

ATTENTION:

Delete this paragraph if rack is not to be provided. Enter the seismic requirements for the battery site using the

appropriate building code.

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