"Venting in battery compartment to release hydrogen". I have 3 batteries under the aft berth port side but no vent. How necessary is this and would a vent to the engine compartment be otherwise sufficient?
Paul Hood '81 C&C34 'Refuge' Georgian Bay _________________ Date: Wed, 25 Jan 2017 19:45:31 -0600 From: Frederick G Street <f...@postaudio.net> To: cnc-list@cnc-list.com Subject: Re: Stus-List 35 MK I battery locations Message-ID: <51ed7387-01ca-419d-9c57-008eb705d...@postaudio.net> Content-Type: text/plain; charset="utf-8" Here are most of the requirements: > ABYC Standard E-10.6. Storage Batteries - Installation > > Batteries shall be secured against shifting. > > Each installed battery shall not move more than one (1) inch in any > direction when a pulling force of ninety (90) pounds > > or twice the battery weight, whichever is less, is applied through the center of gravity of the battery as follows: > > (1) Vertically for a duration of one (1) minute > > (2) Horizontally and parallel to the boat?s center line for a duration of one (1) minute fore and one (1) minute aft. > > (3) Horizontally and perpendicular to the boat?s center line for a > duration of one (1) minute to starboard and one (1) > > minute to port. > > To prevent accidental contact of the ungrounded battery terminal to ground, each battery shall be protected so that metallic objects cannot come into contact with the ungrounded battery terminal. This may be accomplished by means such as: > > (1) Covering the ungrounded battery terminal with a boot or > nonconductive shield, > > (2) Installing the battery in a covered battery box, or > > (3) Installing the battery in a compartment specially designed only for the battery(ies). > > Each metallic fuel line and fuel system component within twelve (12) inches and above the horizontal plane of the battery top surface as installed shall be shielded with dielectric material to protect against accidental short-circuiting. > > NOTES: 1. Terminal insulation or battery covers do not comply with this requirement since during installation or removal of a battery, these protective devices are usually removed in order to connect the cables. > > 2. Any nonconductive material maybe used for shielding as long as it is durable enough to withstand accidental contact by a tool or the battery terminals during servicing, installation or removal. > > Each battery shall not be installed directly above or below a fuel tank, fuel filter, or fitting in a fuel line. > > NOTE: This does not prohibit a battery from being installed directly above or below an uninterrupted fuel line; however, if this fuel line is within the twelve (12) inch envelope of the top surface of the battery it shall be shielded dielectrically as required in ABYC E-10.6.d. > > A vent system or other means shall be provided to permit the discharge from the boat of hydrogen gas released by the battery. Battery boxes whose cover forms a pocket over the battery shall be vented. > > NOTE: These provisions also apply to installations of sealed batteries. > > If the mounting surface or components of the boat in the immediate > vicinity of the battery location are of a material attacked by electrolyte, a mounting means shall be provided that is made of a material that is not damaged by electrolyte. > > Fasteners for the attachment of battery boxes or trays shall be isolated from areas intended to collect spilled electrolyte. > I don?t see it here, but the box also needs to be able to contain all of the electrolyte contained in the batteries housed in the box, if the cases crack. ? Fred Fred Street -- Minneapolis S/V Oceanis (1979 C&C Landfall 38) -- on the hard in Bayfield, WI :^( > On Jan 25, 2017, at 4:56 PM, Josh Muckley via CnC-List <cnc-list@cnc-list.com> wrote: > > What is the exact requirement for a battery box? Not "good practices" but specific requirements? Battery boxes are always so bulky and inefficient. But a glassed in plywood box can be made to fit very exacting and efficient spaces. > Alternatively you could just do AGM 6v golf cart batteries. > > Both main and aux battery banks were installed under the starboard dinette seat of my boat. 200 Ah forward and 400 Ah aft. There's few other places to put them. > > The prospects of lithium technology are very encouraging. Near 100% charge/discharge efficiency. Lightweight. Energy dense. Maybe just drag your feet on this project until the price comes down and the boat kitty has grown. > > > > Josh Muckley > > S/V Sea Hawk > > 1989 C&C 37+ > > Solomons, MD > -------------- next part -------------- An HTML attachment was scrubbed... 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