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Keep the batteries as fully charged as possible, but with the minimum of overcharge, and they will give better service and have longer life. Never permit the battery to remain in a discharged condition for any length of time.

The charging rate should not exceed 21 amperes. The rate to be used depends on:

(a) The capacity of the charging equipment. (The rated current output, in amperes, of the charging equipment must not be exceeded.)

(b) The state of charge (Determined by the specific gravity)

(c) The time available for charging.

In installations where the charging rate can be varied:

(a) At the end of the day's show read the specific gravity of the batteries just used.

(b) Charge at the rate shown in the following table corresponding to this specific gravity and the hours available before the next show.

CHARGING
RATE
LENGTH OF CHARGE
6 Hrs.
8 Hrs.
10 Hrs.
12 Hrs.
14 Hrs.
16 Hrs.
18 Hrs.
20 Hrs.
4 amps
. . . . .
. . . . .
. . . . .
. . . . .
1.195
1.195
1.195
1.190
5 "
. . . . .
. . . . .
. . . . .
1.195
1.195
1.190
1.190
1.185
6 "
. . . . .
. . . . .
1.195
1.195
1.190
1.185
1.180
1.175
7 "
. . . . .
1.195
1.195
1.190
1.185
1.180
1.175
1.170
8 "
. . . . .
1.195
1.190
1.185
1.180
1.175
1.170
1.160
9 "
. . . . .
1.195
1.190
1.180
1.175
1.170
1.160
1.155
10 "
1.195
1.190
1.185
1.175
1.170
1.160
1.155
1.145
11 "
1.195
1.190
1.180
1.170
1.165
1.155
1.145
1.140
12 "
1.195
1.185
1.175
1.170
1.160
1.150
1.140
1.130
13 "
1.190
1.185
1.175
1.165
1.155
1.145
1.135
1.125
14 "
1.190
1.180
1.170
1.160
1.150
1.135
1.125
. . . . .
15 "
1.190
1.175
1.165
1.155
1.140
1.130
. . . . .
. . . . .
16"
1.185
1.175
1.160
1.150
1.135
1.125
. . . . .
. . . . .
17 "
1.185
1.170
1.160
1.145
1.130
. . . . .
. . . . .
. . . . .
18 "
1.180
1.170
1.155
1.140
1.125
. . . . .
. . . . .
. . . . .
19 "
1.180
1.165
1.150
1.135
. . . . .
. . . . .
. . . . .
. . . . .
20 "
1.175
1.160
1.145
1.130
. . . . .
. . . . .
. . . . .
. . . . .
21 "
1.175
1.160
1.140
1.125
. . . . .
. . . . .
. . . . .
. . . . .
22 "
1.170
1.155
1.130
. . . . .
. . . . .
. . . . .
. . . . .
. . . . .
23 "
1.165
1.150
1.125
. . . . .
. . . . .
. . . . .
. . . . .
. . . . .
24 "
1.165
1.150
1.125
. . . . .
. . . . .
. . . . .
. . . . .
. . . . .

Example:-If the specific gravity is 1.150, and there are 16 hours before the next show. Find in the column headed "16 Hrs." the value 1.150. About half way down and at the left of the same row with 1.150 will be found the charging rate, 12 amperes, which is to be used.

At the beginning of each show check the specific gravity of both batteries. They should both be above 1.195 unless the preceding show has been unusually long. For the coming show use the battery which was idle the day before. If the other battery (the one on charge) reads above 1.195 in specific gravity, place it on open circuit; if below 1.195, reset the charging rate to correspond to the specific gravity and the length of the show in hours (use the table on page 57) so that it will be fully charged by the end of the show, when it should be placed on open circuit.

7


Chapter Four Pages
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Chapter
[1] [2] [3] [4] [5] [6] [7] [8] [9]
[10] [11] [12] [13] [14] [15]

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