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B-4
Appendix B - Battery Information
©2002 Xantrex Technology Inc. All Rights Reserved.
P/N 975-0049-01-01 Rev A 10/2002
Estimating Battery Requirements
To determine the proper battery-bank size, it is
necessary to compute the number of amp hours that are
required between charging cycles. When the required
amp hours are known, size the batteries at twice this
amount to ensure the batteries are not regularly over-
discharged.
To compute the amp-hour requirements, the amp-hour
ratings of each appliance powered by the unit must be
added together. Use the figures from the nameplate
label on the appliances, then use the formula WATTS =
VOLTS x AMPS. Then divide the calculated wattage of
the load by the system battery voltage to determine the
amperage the load will draw from the batteries.
(AC current) x (AC voltage)/(battery voltage) = DC amps
Watts
Example
:
To determine DC amps when AC amps are specified on the label:
Nameplate label specifies 6 amps at 120 Vac.
The system battery voltage is 24 volts DC.
• First determine the wattage by using the formula:
WATTS = VOLTS x AMPS = 120 x 6 =720 watts.
• Then divide the wattage by the system battery voltage to determine the
DC amperage.
720/24 = 30 amps DC
To determine DC amps when watts are specified on the label:
Nameplate label specifies 720 watts.
The system battery voltage is 24 volts DC.
(watts)/(battery voltage) = DC amps
(720/24 = 30 DC amps)
Содержание Trace 512 UR-UPS
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