Duty cycle - spec30180012

DOE-SPEC-3018-96

ATTENTION:

Select one of the following paragraphs 3.2.2. Use the first paragraph for UPS applications. Enter the kVA rating

and efficiency of the UPS to which the purchased battery will deliver power, and the battery rated life.

********************

3.2.2

Duty cycle. Each battery shall supply UPS load of [ ] kVA at 0.8 power factor

(PF) lagging ([ ] kVA at 1.0 PF) for [15] [ ] minutes. Inverter full-load

efficiency shall be approximately [90%.] [ %.] Each battery shall be rated for a

[20-year] [ -year] life to operate with the following current and voltage

harmonics fed back from the UPS:

ATTENTION:

Enter the maximum current and voltage harmonics to which the battery will be exposed. These values should be

available from the UPS manufacturer; also consult IEEE 519 for guidance.

********************

a. Maximum Current Harmonics (p-p): [5%] [

]

b. Maximum Voltage Harmonics (p-p): [10%] [

ATTENTION:

Use this paragraph for general-purpose applications. Verify the duty cycle (Appendix B) is correct, and attached to

the specification. Enter the lowest electrolyte temperature expected.

********************

3.2.2

Duty cycle. The batteries shall supply power for the duty cycle noted in

Appendix B and diagrammed in Attachment 1, when the temperature in the

battery room is at its lowest level. Note that this duty cycle represents the loads

to be served by the battery and does not include design margin, aging or

temperature correction factors (refer to paragraph 3.2.6). Electrolyte

temperature at the beginning of the discharge duty cycle shall be assumed to be

[ ]F ([ ]C). Each battery shall operate for a [20-year] [ -year] rated life.

Each battery shall perform in accordance with the requirements of its respective

duty cycle at any time, including at time of delivery and when the battery has

reached its rated life.

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, however, 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%.

********************

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.