Capacity

DOE-SPEC-3019-96

ATTENTION:

Indicate below required capacity at time of delivery. If 100 % capacity is required, this requirement costs additional

money and actually reduces battery life by a few cycles. If the proper aging factor has been used in sizing the

battery then 100% capacity at delivery is not required. If the installation is for a short-term application where sizing

was based on design and aging factors of 1.0, then 100% capacity may be required. For many applications 90%

capacity at time of delivery is sufficient. As the battery string cycles, its capacity increases eventually reaching

100%.

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3.2.3

Capacity. Batteries shall be greater than or equal to [90%] [100%] [

%] rated

capacity at the time of delivery.

Charging cycle. The batteries shall be assumed to be fully charged and

3.2.4

stabilized at the open-circuit voltage specified in Seller's proposal (see

Appendix B) just prior to commencement of the duty cycle. During normal

operation, each battery shall be continuously float-charged by its battery charger.

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. It is recommended that valve-regulated type batteries be recharged at their float-voltage rating

(2.25 V/cell) in order to reduce the possibility of thermal runaway. 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 [2.25] [ ] 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.]