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).
Experiments for charging a standard battery to a specific charging characteristic.
| Identifier | ExFiles\Box 54\2\ Scan120 | |
| Date | 10th October 1927 | |
| X4617 To R. {Sir Henry Royce} from EFC. {E. Fowler Clarke - Electrical Engineer} c. E. {Mr Elliott - Chief Engineer} Da. {Bernard Day - Chassis Design} c. P.N. Wor. {Arthur Wormald - General Works Manager} c. BY. {R.W. Bailey - Chief Engineer} BJ. EFC {E. Fowler Clarke - Electrical Engineer} 5/T10.10.27. EXPERIMENTS ON CHARGING A STANDARD BATTERY X664✓ TO A CHARGING CHARACTERISTIC. Reference of previous report on this subject EFC {E. Fowler Clarke - Electrical Engineer} 5/T10.1.27, in which we described the results of charging an up-to-date standard P & R battery to the characteristic - V = 17 - .25 A carried out practically by using a voltage maintained at 17.0 with a series resistance of .25 ohm. It was considered of interest to try a further test to another characteristic nearer to the condition of constant voltage charging. The characteristic fixed upon was - V = 16 - .15 A carried out practically by using a voltage maintained at 16.0 with a series resistance of .15 ohm. Although on this characteristic the finally sustained P.D. was only 15.5 (as against 16.1 in the previous case) and although the P.D. reached on constant current charging at normal rate was 16.2 originally and now 15.9, i.e. for 6 amperes, it was found in these tests (details of which are contained in my assistant's report attached) that full capacity can be obtained from the battery on discharge for three discharges in succession, the actual capacities realised being - After constant current ( 6 amps) charge 84.5 ampere-hrs. charging to characteristic (V=16 - .15A) 82.4 " " second charge to " 83.2 " " third " " " 84.0 " a further charge with a constant current of 6 amperes. 84.0 " Contd. | ||