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blown fuse

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nicholass View Drop Down
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Joined: 22 June 2022
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    Posted: 22 June 2022 at 22:49
Hi all,

new here, since a couple of days new owner of a Hanse 455.
I bought a 12V kettle (dometic, uses 20 amps, so I thought it would work considering the socket says: max 20A), and plugged it in the cigarette lighter 12v socket, but I think it blew the fuse because the kettle only lit up for a few seconds. and now won't.
Does anyone know which fuse I have to replace? Or have the diagram of the 455?

Thank you!

Kind regards,

Nicholas

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nicholass View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote nicholass Quote  Post ReplyReply Direct Link To This Post Posted: 23 June 2022 at 09:22
I think I found it. Its a mini 10A fuse. The socket says max 20A. How (un)safe) would it be to increase the fuse used here to say 15 and see if that holds? (Considering the socket should take a max of 20A it says)

Thanks.

Nicholas
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Matt View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Matt Quote  Post ReplyReply Direct Link To This Post Posted: 23 June 2022 at 11:27
Probably not recommended. The fuse is to protect the wire from melting and causing a fire. Chances are the wire is not big enough to handle 20amps given circuit has a 10A fuse.

 if you want to use the max potential of the outlet only safe option is to rewire the circuit with thick enough wire back to carry 20A over the distance involved.
HANSE 445 #231 "ALBION"
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S&J View Drop Down
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Joined: 30 August 2014
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Post Options Post Options   Thanks (0) Thanks(0)   Quote S&J Quote  Post ReplyReply Direct Link To This Post Posted: 23 June 2022 at 18:39
I agree that I would not increase the fuse rating for the cigarette lighter.  I have just investigated this for various uses (hi pressure pump for tender, charger for ePropulsion) and decided a dedicated circuit with "proper" connections was better.  Still on my project list...

However you may be disappointed even if you get the kettle to run off DC.  The same energy is required to raise a given quantity of water a given number of degrees regardless of AC / DC.

If a domestic 1Kw kettle takes 3 minutes (total guess - my kettle is so old the power rating isn't legible) that will be 3KW.  12V X 15A = 180W, so maybe quarter of an hour to boil water.  I'd use the gas! 

My AC equipment is only used on the rare occasions I have shore power.  Some of my crew have been disappointed that their hair dryers don't work aboard.  If you've seen my picture, you'll realise that, being follically challenged, this isn't something I need!
H458 #159 Primal Mediterranean cruising
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Ian Coverdale View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ian Coverdale Quote  Post ReplyReply Direct Link To This Post Posted: 23 June 2022 at 21:52
Contacts on those plugs/sockets are not designed for 20A no matter what the panel manufacturer thought ... they are appallingly bad. Only became popular as every car at one time had a cigarette lighter.

Suggest you cut plug off that kettle then use a new plug/socket that is rated for 20A. No problem with drawing 20A from your Hanse electrical system ... just not through that socket.





Ian & Andrea
SV Gabrielle (H445)
Portishead, SW England.
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Ian Coverdale View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ian Coverdale Quote  Post ReplyReply Direct Link To This Post Posted: 24 June 2022 at 12:40
Suggest SP21 'Aviation' connector. 2-pin versions rated fo 30A and they cost 10 $/£/ on Amazon. We have them at nav-station, cockpit and garage for equipment like spotlight, dinghy inflator and air-compressor. Far better quality than 'marine' connectors and one-third the price.

Cheers.

Ian & Andrea
SV Gabrielle (H445)
Portishead, SW England.
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nicholass View Drop Down
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Joined: 22 June 2022
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Post Options Post Options   Thanks (1) Thanks(1)   Quote nicholass Quote  Post ReplyReply Direct Link To This Post Posted: 24 June 2022 at 22:00
Thank you everyone for the help and tips! Really helped.
I fixed the fuse, but didn't upgrade the wiring to accommodate this kettle.  I exchanged the 12v kettle as this was going to take too much time, as pointed out.
Will get a 220v kettle for in marina's and just use the stove at sea!

Nicholas
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