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).
Experiments on charging batteries to the characteristic V = 17 - .25 A.
| Identifier | WestWitteringFiles\Q\December1926-January1927\ 92 | |
| Date | 1st January 1927 | |
| To R.{Sir Henry Royce} from EFC. c. BJ. E.{Mr Elliott - Chief Engineer} c. Da.{Bernard Day - Chassis Design} PN.{Mr Northey} c. Ev.{Ivan Evernden - coachwork} EP.{G. Eric Platford - Chief Quality Engineer} ORIGINAL EFC5/T10.1.27 X4617 EXPERIMENTS ON CHARGING BATTERIES TO THE CHARACTERISTIC V = 17 - .25 A.{Mr Adams} One or two experiments have been made on the comparative capacity on discharge obtained from various standard 40/50 HP. batteries for - (a) Charging at constant rate at 6 amperes. (b) Charging with a terminal supply at a voltage of 17 - 1/4 V for every ampere running into the battery. Actually this is brought about by sustaining a constant voltage of 17 across two points from which the battery is charged through a fixed series resistance of .25 ohm. as diagram:- 17VOLTS maintained .25ohm constant. The first test was on a standard P & R RR.11 battery. Charged at a continuous current of 6 amperes, the highest sustained P.D. on charge was 16.6. On low rate discharge, through an invariable external resistance of 1.80 ohms it gave 65 ampere-hours. The-n the battery was charged to the characteristic. The charge commenced at 16 amperes and gradually tapered down to 3.5 amperes, when the sustained P.D. was 16.1, which remained constant for three hours. Contd. | ||