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martynw
martynw

Posted: Thu Dec 16, 2010 6:13pm

Post Subject: 12 volt electrics

I am fitting out a 50 foot narrowboat. The engine has twin alternators. Do I need some form of voltage stabiliser in the system to counteract any surges? If yes can you suggest type or where to purchase? Many thanks. Martyn NB Daisy May

Tony-B
Tony-B

Posted: Thu Dec 16, 2010 7:08pm

Post Subject: 12 volt electrics

Dear Martyn, you will already have them for the normal electrical circuits - they are called batteries. The alternators will have their own inbuilt voltage regulators to protect the batteries from over charging. However there is a caveat to this. Things like the water pump and possibly electrical toilet turning on and off will produce voltage spikes if you had a way of measuring them. These will not affect typical electrical components because they should have been designed to allow for the spikes but there are two things you need to take care over. If you are going to use 12 volt LED lighting it is important to make sure each lamp/bulb is equipped with its own surge suppressing circuit. The better ones are so do not be over-keen to buy on price. Secondly if you get (say) a mains TV that is powered from a 12v "wall wart"/plug top transformer & rectifier and decide to power it directly from the boat's 12v supply it would be a good idea to use a stabiliser in the supply line. This should damp those surges and the increase of voltage when charging which could damage such a TV because it is designed for a steady 12v supply - not what we get on boats. Some people have got away without such a device for years but its something of a gamble. Tony Brooks

martynw
martynw

Posted: Sun Dec 19, 2010 2:17pm

Post Subject: 12 volt electrics

Dear Tony, many thanks for the information. It was most helpful. Martyn nb Daisy May

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