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).
Letter requesting further information to diagnose a faulty regulator causing a battery to overcharge.
| Identifier | ExFiles\Box 166\2\ img222 | |
| Date | 26th October 1938 | |
| 6092. To Rm{William Robotham - Chief Engineer}/IMW.{Ivan M. Waller - Head of Chateauroux} Hotel de France, Chateauroux, Indre, FRANCE. Rm{William Robotham - Chief Engineer}/RC.{R. Childs}24/JH.26.10.38. With reference to your report of 25.10.38. in which you say that the regulator is out of order, and causing the battery to be overcharged. We are at a loss to know what could have happened to this unit and would like some further details. It would greatly assist us, if you would supply the following information - (1) Average number of hours (per 24 hours) run in, (a) Daylight. (b) Darkness. (2) The total load, and units composing same, (Lamps, wireless etc) during. (a) Daylight running. (b) Darkness running. (3) What is the usual charging rate, as shown on the ammeter, under running conditions of (a) and (b). (4) With a load on the system of about 18 - 19 amperes, is the charging current more than one or two amperes, at any speed. (5) With the ignition and petrol pumps only on, does the charging current rise to and remain steady at a maximum with increase in speed, or does it appear to continue to rise until the ammeter pointer goes off the scale. We are anxious to know exactly what the trouble is as this type of regulator is more or less decided upon for Bentley cars. We would also like to point out that it is characteristic of this type of regulator to permit a high charging current to enter the battery just after using the starter motor. This current may be as high as 20 amperes. If the unit is working properly, however this will drop to a lower value in a short time, as the battery recovers. Cont'd.{John DeLooze - Company Secretary} | ||