Battery switches should be  ignition proof, and approved  by UL, ABYC, and 
others.
You should not have to worry about a hydrogen explosion, but if you are still 
concerned, make sure that the locker is well vented, perhaps both at the top 
and the bottom.
Hydrogen, being lighter than air will vent at the top, but the lower vent will 
facilitate the air flow.

On my boat, a 27 year old C&C 41, CB, I have 3 batteries installed in the lower 
part of a hanging locker. The battery switch is located near the middle of the 
same locker.
It does have a separate cover over the terminals, just to prevent any metal 
objects  from shorting to the terminals, but this cover is by no means gas 
tight. 
Never had a problem.

Just my .02 $  

Don Wagner
 C&C 41 CB
Der Baron
Hull # 93
1986
  ----- Original Message ----- 
  From: Richard H. Bernstein 
  To: cnc-list@cnc-list.com 
  Sent: Saturday, April 27, 2013 4:38 PM
  Subject: Stus-List third battery



  We are planning to install a refrigeration unit, hence the need for more 
juice. But, the question is--where did you find space for the extra battery? 
There's a space forward of the locker under the quarter birth--right under the 
seat for the nav table. But that's where the battery selector switch is, and I 
thought it is not advisable to put a battery to close to a potential source of 
spark because of the possibility of hydrogen gas. I'm probably going to use 
part of that space for the charger, also.


  Richard Bernstein
  LUNA 1984 C&C 35
  Lake Champlain, Vermont







  One my 35 MKII,  I made room for two 6 volt golf cart batteries (house
  supply) and 1 group 24 deep cycle battery that I use as a starting battery.
  All told with those 3, I should have somewhere around 300 amp hours of
  power, using the house bank first of course and then I need to do a motor
  cruise to get things back up.  I run an adler barbour refrigeration unit and
  I have pressurized hot and cold and regular incandescent 12 V lighting,
  stereo and electric marine toilet, so far so good for me.next is an anchor
  windlass which will take a lot of instantaneous power but I intend to
  install a battery forward with charging from the engine alternator to do
  that.less low gage conductor wire required that way I think, but I am sure
  Rich will set me right on that



  Not sure if you have the space, the 6V cart batteries I got are rather tall



  Dwight Veinot

  C&C 35 MKII, Alianna

  Head of St. Margaret's Bay, NS



   _____  

  From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Richard
  H. Bernstein
  Sent: April 27, 2013 4:42 PM
  To: cnc-list@cnc-list.com
  Subject: Stus-List third battery



  I would like to install a third battery on Luna to give more power on the
  house side. I am curious where others with C&C 35's have put it. There
  doesn't seem to be room for another under the starboard quarter berth where
  the others are. Any advice??





  Richard Bernstein

  LUNA 1984 C&C 35

  Lake Champlain, Vermont


  Richard Bernstein
  LUNA 1984 C&C 35
  Lake Champlain, Vermont




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