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).
Trickle charging tests on a battery at various loads and rotational speeds.
| Identifier | WestWitteringFiles\J\January1923\ Scan10 | |
| Date | 1st January 1923 | |
| Contd. -4- EFCL/T3.1.23. of suitable value with the loads of resistance proper for the job, with the steady trickle charging current to the battery with no load on the system, remained fairly closely at the value 2 amperes. In the colder condition this current would be slightly less. It will be understood that we are referring to the trickle charge given to a battery which is otherwise fully charged, all plates being in such a condition as to gas vigorously with the normal charging current. If the battery were not up to this state of charge, then owing to its smaller E.M.F., this trickle current would be materially increased. Tests were made with the dynamo unit in an intermediate condition of temperature (45°C) of putting on loads of various values in steps for three different rotational speeds, viz. 760, 1500 and 2250, and the results obtained are in accordance with the following tables:- Speed. Amp. load on Amp. delivery Resultant current R.P.M. system. of dynamo unit. charging or discharg- ing (-) battery. 0 1.2 1.2 1.0 2.0 1.0 760 2.0 2.75 .75 3.0 3.7 .7 4.0 4.6 .6 5.0 5.6 .6 6.0 6.6 .6 7.0 7.5 .5 8.0 8.45 .45 9.0 9.45 .45 10.0 10.45 .45 11.0 11.4 .4 12.0 12.3 .3 13.0 12.75 -.25 14.0 12.8 -1.2 15.0 13.0 -2.0 Contd. | ||