Nominal cross
Table 7-2
Voltage decrease indicates as V = -&-
xRxIx!J
R means resistance (a! 100 m) on the above table.
I means electric current through the wire (A).
Q means the length of the wire (m).
The length of the wire indicates round length, it means twice the length from generator to electrical
tools.
7-2 DC OUTPUT
When the generator is employed to recharge batteries, care must be exercised about the specific gravity of
electrolyte in each battery case.
7-2-l MEASURING THE SPECIFIC GRAVITY OF ELECTROLYTE:
The specific gravity changes with temperature; therefore, it is converted to another, corresponding to 20°C.
s20
= St + 0.0007 (t - 20)
where
s20
= Specific gravity corresponding to 20°C
St
= Measured value
t
= Temperature at time of measurement
7-2-2 REMAINING CAPACITY ESTIMATED WITH REFERENCE TO THE SPECIFIC GRAVITY OF
ELECTROLYTE:
SPECIFIC GRAVITY
REMAINING BATTERY
(20°C)
(%I
REMARKS
1.260 100
Good charged condition
1.240
87
1.220 75
Charging is necessary.
1.200 62
1.180 50
Immediate charging is necessary.
1.160 37
1.140
25
,
Table 7-3
-
18-
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