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- Newsgroups: sci.electronics
- Path: sparky!uunet!pipex!warwick!coventry!lsg001
- From: lsg001@cck.coventry.ac.uk (Graham Wilson)
- Subject: transformer question
- Message-ID: <BxIoyC.8qI@cck.coventry.ac.uk>
- Sender: news@cck.coventry.ac.uk (news user)
- Nntp-Posting-Host: cc_sysk
- Organization: Legal Department - Coventry University
- Date: Tue, 10 Nov 1992 20:30:11 GMT
- Lines: 39
-
-
-
- ** My parents have a narrow boat which has both 12 volt and 240 volt
- supplies. When the marine engine is running it drives 2 x 75 amp alternators.
- The two alternators have been adapted and the charging circuitry
- has been removed. The 150 amp hour power output from the two alternators
- passes into an electronic charging controller called a TWC unit. It is
- the TWC unit which controls the charge rate. The TWC unit supplies
- 3 batteries (total capacity) 500 amp hour through a 3 way blocking
- diode. A heat sensor attached to the batteries is connected to the TWC
- unit to detect temperature rises within the cells. I gather that this
- system charges the batteries using something called intelligent
- charging.
-
- Initially, when the boat engine is started the two alternators run
- quite hot for the first 15 minutes. After this point, they start to
- cool down ( I assume as a result of the TWC unit decresing the charging
- rate).
-
- My father has a portable generator on the boat as well which provides
- 240 volts at 50 or 60 Hz. In case the main engine fails he would like
- to use the mains generator to power a 240 volt to 12 volt transformer
- which he could connect into the TWC unit which would provide upto
- 150 amp hour in effect taking over the role of the two alternators.
-
- I was wondering whether it is possible to obtain a 240 to 12 volt
- transformer capable of achieving this and whether it would be
- possible to conect one side of the transformer to the 240 supply
- and the other to the TWC unit without needing any other additional
- electronics ? Incidentally, in order to use this transformer would
- the two alternators need to be isolated from the circuit ?
-
- Thanks for your help in advance.
-
- --
- *********************************************************
- * Graham Wilson * lsg001@cck.coventry.ac.uk *
- * LL.B. Law III * Coventry University *
- *********************************************************
-