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).
Instructions on how to charge the battery externally using a plug and resistance lamps when the engine is not running.
| Identifier | ExFiles\Box 26\2\ Scan095 | |
| Date | 6th August 1919 | |
| R.R. 285 A (100 T) (S.F 816 6-8-19. G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2460 -8- Contd. available where the car is housed it is possible to charge the battery in position without running the engine. For this XXXXXX purpose it is necessary to procure a plug from Messrs. Lucas to fit the socket on the switchboard. The two terminals of the socket are in direct connection with the battery, therefore, if the plug be placed in series with a circuit in which are lamps to act as resistances, current for these lamps may be made to pass through the battery. Proper steps, should, of course, be taken to ensure that the current is passing through the battery in the charging direction. This can be ascertained by reversing the plug in the socket. In the correct or charging position the resistance lamps will be less brightly illuminated than normally or than in the wrong position. A better method is to use a pole-finder of standard pattern or pole-finding paper. It is also necessary to know what current the resistance lamps take and to adjust the number in circuit and their relative position (series or parallel) to make up the required charging current. This method of charging is rather uneconomical and should only be used if it is found by experience that the conditions of running are such that a greater demand is made on the battery than can be replaced by the dynamo. Another point to watch in using this method is to see that the battery is on the low potential side of the supply mains inrelation to the lamps, otherwise, owing to the chassis | ||