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).
Comparison of battery cell weights and a performance report on Edison 40 amp-hour accumulators.
| Identifier | ExFiles\Box 1\7\ B001_X15 20 46 50 59-page215 | |
| Date | 19th February 1920 | |
| -2- Contd. Weights re cells. Edisons cells only, } 12 volts 16 lbs. 14 ozs. no box. } C.A.V's. cells only } 12 volts 72 lbs. 12 ozs. no box. } (120 amp.hours) } Edison cells } including tray } and fittings. } 12 volts 28 lbs. 4 ozs. 40 amp. hours } Report Re Edison 40 amp. hour Accumulators. I cannot report very favourably so far as regards above cells re out-put it has a very bad percentage compared with others (acid) 16 amp. hours or 140.8 watt hours at a discharge (continuous) of 1 amp. per hour. At a discharge of 5 amps. (continuous) which is under the normal discharge (7 amps) it shows even worse being of an average of 5 to 10 amp. hours. According to the varying rate of discharge and when left standing recovering themselves to such a great extent these cells point to great internal resistance and polarizing. I dont think they would be suitable for lighting system owing to the varying discharge. They may stand alright on the battery coil circuit owing to their being intermittent and allowing them time enough to recover themselves (see later report). Contd. | ||