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CarpeDiem

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Everything posted by CarpeDiem

  1. That was by Tidetech. They came here and did some recording at various locations and then did some hi-res modelling based on that data. Even the AC data wasn't real time. Tidetech made the data free. https://www.tidetechmarinedata.com/news/americas-cup-practice-day-2-auckland-tidal-currents
  2. I am not aware of any live tidal stream feeds. I believe everything we have access too is modelled from historically collected data. If no one else comes back with an answer I would suggest writing to LINZ and asking them. They run the tidal stations and will at least be able to point you in the correct direction... please let us know what you find out. This index enables you to identify the locations of current and historic sea level stations around New Zealand, on offshore islands (including Raoul Island, Chatham Islands and the sub-Antarctic islands), several South West Pacific
  3. Its primary mechanism of reproduction is asexual, which is caused by fragmentation. Sexual reproduction causes the Caulerpa plant to die completely. The plant has to be already on its way out for it to initiate sexual reproduction. Our Caulerpa is young healthy vibrant... Anchors fragment the plant. Fragments as small as 1cm can be a viable plant, carried by the currents or carried in anchor wells long distances. If it was being spread easily by currents then the east Auckland current would spread it all the way down the east coast of the north island to the Chatham rise.
  4. I am not aware of any citations to court judgements. The only references to citations in this thread have been to secondary legislation, namely, Maritime Rule 40. Unless your marina or other some other entity has some rules that you are contractually obliged to adhere too, I can't find anything preventing this - so long as if you do not have AC power - then it is much greyer For a bit of thread drift, I got myself some Sodium-ion cells the other day. Nothing in any standard, legislation or anywhere else about Na-ion batteries
  5. Standards don't get cited by the court - that's a misunderstanding. Standards get cited in legislation (or in private policies). Two examples: New Zealand Marinas have "cited" AS/NZS 3760 - In-service safety inspection and testing of electrical equipment and RCDs - Marinas have set a private rule, that requires users of shore power to have tested and tagged cables - this is not a legal requirement - it is a private requirement of the Marina, based on industry best practice. This standard is not "cited" in any NZ legislation. MartimeNZ Rule 40 (link), has cited AS/NZS 3004.2:20
  6. Gasket arrived early from Australia and I got everything back together today. Running exactly like it was before. The only oddity was a sandy kind of gel on the coolant side of the heat exchanger.. (see photo) From extensive googling, I have reached the conclusion that this is the coolant starting to gel as it deteriorates which has picked up left over sand from the casting process... But really that's just a guess... It could be a new species that lives in volvo yellow coolant... I did notice a small amount of corrosion on the raw water pump. I have decided it's probably be
  7. Hey IT. Not disputing that it's the current standard. That is without question. It absolutely is the most current standard. The question is, how it is legislated and mandated onto private pleasure vessels? If it is not legislated specifically to private pleasure vessels then it does not apply to private pleasure vessels. It's really that simple. Standards do not become a legal requirement unless there is a legislative instrument enforcing such. I will do some more investigation
  8. For Auckland, 3004:2014 is available at the library. Only at Auckland Central - they won't send it to other libraries. I am waiting for them to get AS/NZS 3760:2022 on the shelf. I have been doing my test and tagging myself and there are some updates I need to get across before my tag expires. That's another great example of a standard that is not legislated but is required by a private party, there is nothing in the law requiring test and tagging, but the Marina requires it - so if I want to use my e-box - I need it test and tagged...
  9. Sorry IT. The citations are for the Maritime Act, specifically rule 40. Rule 40 does not apply to pleasure craft. It applies to commercial craft in survey. If you can show me a citation that applies to pleasure craft I will get off my soap box.
  10. OK, the voltage cutoff controller you mention is actually a pretty standard voltage cut-on controller, known as a VSR. The way you explained it that could of been an external regulator. When you start the engine, the VSR detects the alternator and joins both batteries together so that the charge goes to both the house battery and the start battery. This is not suitable for dedicated LiFePO4 as, even at 13.8v, you risk over charge. While the parallel solution would work, I recommend steering well clear of it because it's not really set and forget - and is not really beginner fri
  11. OK. That makes a lot more sense. I will reply to your previous message.
  12. Hi IT, sorry I did not explain myself clearly - my bad. You are referring to the standard - I am referring to the legislation that gives legal force to the standard. Without legislation, (or a private body**), that requires the standard be followed, the standard has no effect. Per the link you provided, AS/NZS3004:2014 is only legislated by the Maritime Act and Maritime Rule 40E - this rule does not apply to private sailing vessels. It applies to commercial sailing vessels that are in survey. The standards.govt.nz site does not list any legislation that gives force to AS/
  13. Can you elaborate on what this is? Part number, model?
  14. Depends. MOSFETs limit current so if you have one rated for 10amp it will never do more than 10amp. It's not like a piece of 10amp wire that you can push 30amps through and watch it glow red. They just won't do it. A massive inrush could destroy it. It would depend on the design of the associated circuitry...
  15. Your cells are designed for energy storage. They meet a different design profile. Just like some Lead AGMs are designed for starting and some are designed for deep cycle. There are LFP cells that will discharge at 180C pulse, 90C for 2 seconds and 45C continuous... A 10Ah battery made with those cells would start a 3GM30 Instead of FETs a starter battery bms would use an automotive grade relay found in electric vehicles.
  16. Hmm.. yeah OK, - I don't think that is the best table Back to my heat exchanger ...
  17. No. It says that after 7100 cycles to 70% DOD - the battery will be good for 70% of it's original capacity. So if you had a 100Ah LFP battery and you pulled 70Ah out of it every single day for 19 years then after 19 years you would have a 70Ah battery.
  18. BMW have had Li-ion start batteries in their production vehicles since 2014. That's about the same time that the AS/NZS standard came out saying we couldn't have Li-ion start batteries on our boats... Hmmm...
  19. This doesn't sound right... Can you maybe post a photo of the "aparatus"? What do you want to achieve? What's the outcome you are looking for?
  20. The day started with a plan to clean up some really minor corrosion on my heat exchanger, corrosion that wasn't causing any problems whatsoever and that my mechanic friend told me to "monitor" I found a suspect hx end cap - OK that's an easy fix... It has two o-rings in it. Might as well do both ends, 4 "gold-plated" o-rings from ovlov is all that's needed to fix that... Job will be over in a hour. Needed to drain the coolant, it's a year early but not a big deal might as well do it now. Performed some yoga moves getting to the petcocks. Trying to put tubes on them and twist th
  21. I am a strong advocate of Li-ion over LA. The Regs are stopping progress and adoption because they can't keep up with the technology. Eg, Li-ion would be perfect as a starter battery. But the regs indirectly (or maybe directly) prevent it. There's absolutely no reason what so ever for low voltage disconnect on LTO batteries. One can take them 0v at and then recharge them to full capacity. A Japanese company produces LFP cells that are designed to deliver 1200a for 10 seconds and are able to peak inrush currents of 2400a - perfect to replace a marine starter battery of 700cca
  22. That's an over generalization. Some AGMs made with lower grade materials may have that limit. A good marine grade AGM will be rated to accept unlimited alternator current. The current is limited by the internal characteristics of the battery. Eg, Optima Yellowtop AGMs state "no amperage limit" when charging from alternator. My 75Ah Optima D31 accepts ~65Amps when charging from empty. Many quality AGM batteries are rated at 0.5C or above by the manufacturer. But you pay for the privilege...
  23. 1C is generally the upper limit for what's on the lfp market. Most manufacturers will tell you 0.5C recommended with fast charge at 1C. That said there's a few starting to offer 3C... but these are generally cylindrical cells. My stock Volvo Penta alternator does 115A... continually... So my design requires me to either have a minimum of 230AH of Lithium-ion or limit my alternator... But then I have exactly the same problem with Lead CARBON - if I want to do it properly... I still have to limit the alternator OR have 345AH of weight!! If I want to stay in the manufacturers recommen
  24. Thanks. I find it strange that 2008 is the only version referenced in the regulations. Section 3 of the Electrical Safety Regulations 2010, which is the legal instrument that gives authority to the as/nzs standard states that: the regulations do not apply to pleasure vessels unless they have connectable installations. connectable installation is one that is designed or intended for, or is capable of, connection to an external power supply that operates at a nominal voltage between 90 and 250 volts AC at standard low voltage. The above clauses in the regulations indicate
  25. Hey IT, I have a couple of questions, which you may be able to answer regarding the standard AS/NZS 3004.2:2014. (which is where the audio and visual alarm requirement comes from) This standard does not appear to be legislated. The latest version of the standard that is legislated in the Electricity Act is 3004.2:2008 (ref: https://www.legislation.govt.nz/regulation/public/2010/0036/latest/DLM2763782.html?search=sw_096be8ed81c5a64a_3004_25_se&p=1&sr=3) MBIE had a working document in mid 2021, one of the recommendation of which was to update the NZ electricity legislatio
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