ABYC doesn’t get any more specific than the verbiage below. The amount of out-gassing is usually pretty small, unless your charger is overcharging the batteries; but hydrogen sulfide gas can be corrosive, so I’d tend to keep it away from the diesel if you can. The vents on the tops of the ABYC/Coast Guard-approved Blue Sea battery boxes are pretty small; it doesn’t take much.
— Fred Fred Street -- Minneapolis S/V Oceanis (1979 C&C Landfall 38) -- on the hard in Bayfield, WI :^( > On Jan 25, 2017, at 8:07 PM, Paul Hood via CnC-List <cnc-list@cnc-list.com> > wrote: > > "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 :^(
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