HYT TR-800, Руководство по обслуживанию

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TR-800 Service Manual
68
For our example, let’s consider the 55 A-h operating capacity, over 5 hours of operating with battery, and
rated battery discharge times of 5 hours, 10 hours, and 20 hours.
1.
=
Tcr
5 hours
⎥
⎥
⎦
⎤
⎢
⎢
⎣
⎡
⎟
⎠
⎞
⎜
⎝
⎛
× ≈
1 . 0
5
5
55
C
55
≈
C
A 55 A-h (0.2C) battery would provide the required energy under room temperature environment.
2.
=
Tcr
10 hours
⎥
⎥
⎦
⎤
⎢
⎢
⎣
⎡
⎟
⎠
⎞
⎜
⎝
⎛
× ≈
1 . 0
5
10
55
C
59
≈
C
A 60 A-h (0.1C) battery would provide the required energy under room temperature environment.
3.
=
Tcr
20 hours
⎥
⎥
⎦
⎤
⎢
⎢
⎣
⎡
⎟
⎠
⎞
⎜
⎝
⎛
× ≈
1 . 0
5
20
55
C
2 . 63
≈
C
A 65 A-h (0.05C) battery would provide the required energy at room temperature environment.
Remember that the above calculations are approximate. Different discharge rates yield different “end of
discharge” cell voltages which were not taken into account. The battery revert module is designed to
disconnect the station from the battery if the input voltage to the module drops below 11 V dc. When in
doubt, you can consult the manufacturer of the battery you intend to use to obtain “project planning data”
charts. Or, you can “err” to the high side and add 10% to 25% to the calculated number. If the battery is
going to experience extremes in temperature, the capacity will be affected. For cold climates, the
capacity may need to be doubled or tripled.
Where to Buy the Battery?
Most of the larger electronic supply houses will carry or can obtain the type and capacity of battery
required for your application. You may be able to deal directly with some of the battery manufacturers
especially if you need large quantities of the same model.