Island Time 1,108 Posted March 20 Share Posted March 20 29 minutes ago, Frank said: For what its worth the Inspector who issued the AC compliance cert for the land yacht said the requirements for lithium battery installations were a moving feast. (slightly paraphrasing) In the time between the initial and final sign off there was some new requirement added . Even if you don't have shore power you can still get yourself into a power of expensive trouble if you don't do your homework, as IT says there is no such thing as a drop installation with Lithium. The nuclear option for batt disconnect is an 175A Anderson connector which we installed along with the BMS smarts https://www.jaycar.co.nz/anderson-175a-power-connector/p/PT4424?gclid=CjwKCAjwiOCgBhAgEiwAjv5whBV6dsFLm-dMHqCnAy4L_gLWqOV8eDgbY0Cl5DNUu6dLiCEE4EegbRoCDegQAvD_BwE Actually those anderson connectors are not that great for LifePo4. Think about this - only 2 of the 18650 cells (3,2v, look like torch batteries) that are in most of the drop ins, shorted, can produce 75a! Short out one 100a/hr LifePo4 battery can produce up to about 20,000 amps. This will blow a fuse of course, BUT, unless it's a class T fuse, it will then arc across the terminals and current will still flow.... So, proper install needs Class T fuse - for each battery - and battery isolation switches. To meet the NZ regs you need a system that gives visual and audio alarms before it shuts off the battery. You can't do that with a bluetooth BMS - It needs CAN or serial control - both of which are wired. Yes the NZ regs are the law - they have been sighted in the courts - currently up to the 2014 standard is my understanding. If you have a commercial vessel, part of the survey is electrical, and you must have a certificate of survey to use a vessel commercially. Private vessels are still subject to the regs, but are not subject to the electrical survey. There is room there I would think so that if you don't follow or exceed the rules, you MAY have an issue if it comes to an insurance claim, especially if the electrics aboard caused the issue. Absolutely Lithium (and other) battery tech is moving rapidly, and the regs struggle to keep up. I have done a few LifePo4 systems for customers, using Eve or Winston cells, but they ALL have Class T fuses, BMS serial controls to control solar, shorepower, Wind gens, external reg Alternators etc, and they all have audible and visual alarms to meet the NZ (and the US ) regs. Trying to keep up with the play.... Quote Link to post Share on other sites
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