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).
Test report on the final peak conditions of the 20 HP chassis charging circuit.
| Identifier | ExFiles\Box 57\1\ Scan020 | |
| Date | 8th December 1925 | |
| X5780 EFC. AC.68. 8th Dec. 1925. X.4642. X.4338. X.4610. CHARGING ON 20 HP. CHASSIS CIRCUIT. A test of the final peak conditions obtaining on 20 HP. chassis charging circuits, similar to that reported in AC.66 of 1st inst. for 40/50 chassis has, been completed. Dynamo 1315 was used, being first set to the production specification; the output in test 5of which was 10.5 amperes (the upper limit) Three standard batteries were employed for the test, two being Exides and one P & R.{Sir Henry Royce} The results are shown in the table:- TABLE 1 NO. | BATTERY Cell Volts. | 1 | 2 | 3 | 4 | 5 | 6+ | Total volts. 6XL3/4. | 2.73 | 2.71 | 2.70 | 2.70 | 2.71 | 2.70 | 16.25 P & R TBD7/10. | 2.97 | 2.95 | 2.97 | 2.95 | 2.95 | 2.95 | 17.72 6XL34/1. | 2.80 | 2.80 | 2.75 | 2.72 | 2.72 | 2.74 | 16.53 TABLE 2 | Temp. °C. | DYNAMO Volts. | Amps. 6XL34/4. | 16-49-65 | 18.0 | 12.2 P & R TBD7/10. | 15-50-65 | 19.5 | 12.6 6XL34/1 | 12.5-50.5-63. | 18.2 | 11.9 Contd | ||