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9-2 DC OUTPUT
When the generator is employed to recharge batteries. care must be exercised about the specific gravity of electrolk-te rn
each batter\. case.
9-2-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 - 10)
where
S~J = Specific gravity corresponding to 20°C
SI
= Measured value
t = Temperature at time of measurement
9-2-2 REMAINING CAPACITY ESTIMATED WITH REFERENCE TO THE SPECIFIC GRAVITY OF
ELECTROLYTE:
c
I
Specific gravity
Remaining battery
I
(20°C)
(%I
Remarks
1.260
100
1.240 87
I
I
Good charged condition
1.220
75
I
Charging is necessary.
1.200
1.180
1.160
1.140
62
50
,
Immediate charging
is
necessary.
37
25
Table 9-2
9-2-3 BATTERY CAPACITY:
The battery capacity is expressed in units of ampere-hour (AH). One AH stands for the capacity capable of providing one
ampere of current for one hour.
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