Rolls-Royce Archives
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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Data tables showing the resultant current on a battery based on amperage load and engine RPM.

Identifier  WestWitteringFiles\J\January1923\  Scan11
Date  3rd January 1923
  
Contd.
-5-
EFCL/T3.1.23.

Speed 1500 R.P.M.
Amp. load on system.
Amp. delivery of dynamo unit.
Resultant current charging or dis-charging (-) battery

0 1.7 1.7
1.0 2.3 1.3
2.0 2.8 .8
3.0 3.65 .65
4.0 4.6 .6
5.0 5.5 .5
6.0 6.35 .35
7.0 7.3 .3
8.0 7.8 -.2
9.0 8.8 -.2
10.0 9.7 -.3
11.0 10.35 -.65
12.0 10.8 -1.2
13.0 11.7 -1.3
14.0 12.6 -1.4
15.0 13.5 -1.5

Speed 2250 R.P.M.

0 1.3 1.3
1.0 2.0 1.0
2.0 2.7 .7
3.0 3.7 .7
4.0 4.6 .6
5.0 5.4 .4
6.0 6.0 0
7.0 7.0 0
8.0 7.5 -.5
9.0 8.2 -.8
10.0 8.8 -1.2
11.0 9.5 -1.5
12.0 10.3 -1.7
13.0 11.0 -2.0
14.0 11.9 -2.1
15.0 13.0 -2.0

It will be seen from the above figures that at any speed in the regulating range the battery is being charged slightly with loads up to approximately half full load, and discharged slightly during the times of heavy load on the system.

Contd.
  
  


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