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).
Test results for output current and charging a fully-charged battery under various conditions.
| Identifier | ExFiles\Box 166\2\ img082 | |
| Date | 5th April 1937 guessed | |
| -2- Test 1. Output Current at 13 volts. Whole output taken through A.1. terminal. A variable resistance connected across a 12 volt battery to control volts. Volts measured at regulator terminals. Condition Regulating current Cold. 13.0 to 16.4 amperes up to 6000 r.p.m. Hot. 8.1 to 9.3 " " " " (after 3 hrs. running) Test 2. Charging a fully-charged battery. Variable resistance, representing ignition load, connected to terminal A.1. current kept constant at 1.5 amperes. A.{Mr Adams} A 12-volt battery, fully charged, was connected to Terminal A.{Mr Adams} Volts measured at regulator terminals. Condition Reg.Volts Batt. Amps (A) Ignition Amp (A.1) Cold. 15.5 9.0 1.5 After running for 15.3 4.8 1.5 15 mins. Hot. 14.5 to 1.2 to 2.4 1.5 (After running for 3 hrs) 15.0 Output fluctuating. Our conclusions are:- (1) The initial (cold) current of 16.4 amperes at 13 volts is satisfactory, but the fall to about 8.5 amperes, brought about by the thermostat, is too much. We hoped that the thermostat would just compensate for the rise in temperature of the windings, and keep the regulating current more or less constant. (2) It appears that the effect of the thermostat must be reduced. continued | ||