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).
Report compiling feedback from different individuals on dynamo and battery charging issues for 20 HP and Phantom models.
| Identifier | ExFiles\Box 54\1\ Scan066 | |
| Date | 2nd December 1925 guessed | |
| -6- Contd. P.S.2. Referring back to my second paragraph on p.4, further information is now to hand. Our Mr. Chandler had sent out a circular enquiry to some of our men and answers from four of them are to hand. Mr. A.{Mr Adams} says :- "My experience goes to show that the dynamo "on the 20 HP. gives insufficient output to maintain "batteries with sufficient reserve during Autumn and "winter running. Artificial charging during these "months is general. "When inspecting a 20 h.p. I always check the "charge shown on the ammeter and if same be below "standard we dismantle the dynamo and clean and re-bed "brushes. This attention has to be given to quite "35% of the 20 HP's in my area. "I have only come across one case of loss of "electrolyte but this was due to a leaking cell. I "know of no case of loss through overcharging.". Mr. B. says :- "I have met a few cases of complaint of under-"charging and several where drivers charge from "a charging board at night. As far as I can say "most cases of under-charging referred to 20 HP. cars.". Mr. C. says :- "The large majority of the cars in my area are "used chiefly on medium and long runs and no difficulty "is experienced in keeping the accumulators charged. "In certain cases, however, where the cars are used "chiefly in towns such as Manchester, Liverpool and "Southport, external means have to be employed from "time to time to keep them charged. The latter also "applies in the case of most of the cars which I have "seen while visiting owners in London. "With regard to overcharging it is difficult to "tell how much battery trouble is due to this, but in "any case, except with the Phantom, the prevention lies "in the hands of the driver. Contd. | ||