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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).
The 20 HP dynamo output on a 14-GIV model and its effects on the battery.

Identifier  ExFiles\Box 62\3\  scan0035
Date  28th February 1930
  
X.6005

Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} from EFC.

EFC4/AD28.2.30.

20 HP. DYNAMO OUTPUT ON 14-GIV.

Answering your Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}3/MJ27.2.30, the high output of this dynamo will not harm the battery so long as the battery is not too near its top state of charge, but when the battery commences to gas seriously it is harmful if the charge is subsequently continued for periods say, exceeding 15 minutes, owing to the rise of temperature of the battery thereby caused and the danger of exceeding the maximum permissible temperature of the electrolite namely 110°F.{Mr Friese}

EFC.
  
  


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