I don't think a formalized commercially available box is specifically required. If you find references contrary please let me know. However "battery boxes" serve multiple purposes beyond acid containment. Properly engineered and installed boxes ensure that a loop seal is maintained such that water cannot get in the box should the boat flood. They simultaneously allow gasses to escape, and provide battery encapsulation.
Here are a few references. https://www.passagemaker.com/technical/the-large-battery-bank-equation-part-i https://www.uscgboating.org/regulations/assets/builders-handbook/ELECTRICAL.pdf https://marinehowto.com/installation-orientation-of-flooded-batteries-on-boats/ ABYC E-10 is the pdf I was looking for but unable to immediately source. ABYC is similar to the underwriters laboratories. They don't write the law but they do make industry standards for safety which will likely define whether or not an insurance claim will be paid. The electrical pdf above gives reference to the CFRs. The actual law. AGM are a type of lead acid technology. They are not at risk of spilling their acid and can be mounted at varying angles and orientations. They can vent gasses, though when they do it is permanently damaging to the battery. If you delve into AGM be mindful of the stringent charging differences and make sure that all of your charging sources (shore power charger, alternator, solar) are changed to match. Do not under any circumstances allow an equalize to be applied to an AGM. Any voltages above 14.6v will cause permanent damage. Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On Tue, Oct 16, 2018, 7:51 AM pete.shelquist--- via CnC-List < cnc-list@cnc-list.com> wrote: > I’m not sure where to reference the regulations/guidelines on this, so if > someone can point me in the right direction I would appreciate it. > > > > I would like to add a couple more batteries and am looking at AGMs due to > their tolerance of being at an angle. Since, as I understand, they are not > technically a lead-acid, do they still need to be installed in a battery > box? I’m very tight on space and could use the extra few inches. > > > > Thanks, > > Pete > > > > > > > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > >
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