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).
The performance of a C.A.V. dynamo and potential battery over-charging issues on car 49-GB.
| Identifier | ExFiles\Box 168b\2\ img011 | |
| Date | 25th September 1919 | |
| Contd. -2- EPC3/T25.9.19. Mr. Hives had asked for the cumbersome three-point switch, which we had temporarily fitted, to be deleted from the system. You remark "Why is the C.A.V. dynamo on 49-GB giving 10 amperes, which seems too much?" We do not quite understand this remark as we have always understood and observed the C.A.V. N.C.R.R. type dynamo to be a 12 volt, 12 ampere machine. The cutting-in speed of this dynamo was quite normal as compared with other C.A.V. machines we have tried. In arranging the electrical system before the car left the works, we experienced the fault which you mention, and eliminated this at the time, so that it must have redeveloped. The battery was fully charged and correctly topped up with acid the day before leaving the works. A possibility is that the battery received too much over-charging on the way down. We have often noticed how prone portable batteries are to lose their electrolyte in a manner which seems almost mysterious. It would appear to require the most scrutinous care to ensure that a battery is always correctly topped up. We should be interested in your remarks on the new C.A.V. cutout. EPC. | ||