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).
Letter detailing the results of continuous and intermittent discharge tests on a sample chassis lighting and starting battery.
Identifier | ExFiles\Box 38\5\ Scan074 | |
Date | 12th May 1920 | |
X.3398 EFC6/T. 12th May, 1920. Messrs. Peto & Radford, Ltd., 12 Heddon Street, Regent Street, London, W.1. 14 Dear Sirs, X.3398 Re Sample Chassis Lighting & Starting Battery. Further to our letter EFC2/AT. of August 20th last., and yours, ref M/C.228 of August 22nd and of Sept. 8th, no reference, we should say that we did obtain slightly better low rate discharge capacity results after charging at a higher rate as you suggested. We were disappointed, however, with the results we obtained on high rate discharge tests, both continuous and intermittent. On the continuous test the battery was allowed to discharge through a constant resistance of .0763 ohm. It started off by giving 136 amperes, the current gradually falling to 120 amperes in a period of 5 minutes, and then falling more rapidly to 100 amperes (or 7.63 volts) in the total period of 6.5 minutes. On the intermittent high rate discharge through the same resistance, there were in the first case, alternating periods of 15 seconds on contact and 15 secs. off, and in the second, 15 secs, on and 45 secs. off. In each case the battery started off at 134.5 amperes. It maintained Contd. | ||