CarpeDiem

I hope the long range Forecast improves 😜😜

Pretty sure it was going somewhere to be scrapped... I vaguely recall that Auckland Council took possession.

I think that would be an opinion not a conclusion. A school teacher once told me that opinions are like arse holes, everyone has one.

To me, it feels unintelligent to conclude, that because we don't know why gravity works we shouldn't trust the science behind counting dolphins.

He used to be a skater, now he's into her instead of skating, so she's a 'skate stopper'... (fwiw I also did not get it... but I had a child on hand...)

I have a very nice little unit from YachtD that captures everything on the N2K network and records it to a sdcard. Unfortunately I now have billions of datapoints collected over 5+ years that I have been unable to process because the amount of information is over welming - but one day I plan on learning/using some big data processing tool to overcome that In the meantime I keep recording everything whenever the network is powered on...

Is it a high tide only affair? Isn't there a low bridge?

Agree 100%.

Yep. My point is that the standard isn't a requirement for leisure craft. Because is not cited by the regulations that apply to leisure craft. However, it is legal requirement for commercial vessels that operate under Maritime NZ Rule 60.

I think you've missed a key point in your assumptions. Namely that SailGP came up with the risk management plan. They developed, wrote, and submitted their RMP, this wasn't forced on them by some government agency. They came up with the rule. They decided that this is how they would proceed if dolphins were seen in the marine mammal sanctuary. Meanwhile, the not for profit volunteer BOI race week committee came up with a risk management plan that allowed racing to continue in the event dolphins were spotted. I think you're barking up the wrong tree, you should take your

As the standard is not legislated in leisure craft it would only cause an issue with your insurance if and only if your insurance company required compliance with the specific (or latest) standard. My insurance policy has no such wording. As the banks are in parallel then if the voltage goes high, eg, 14.7v all 4 BMS's will shutdown within seconds of each other. Likewise a continuous current draw of merely a few amps that brings a single cell to the low voltage disconnect level will have a cascading effect across all 4 BMS's and they will all shut down within minutes of each oth

Really? And exactly what peer reviewed scientific evidence did you use to reach your conclusion? I'm am going to need a lot more convincing that your opinion should be considered over that of the world wide scientific community of experts that periodically come together to assess and assign the threat classifications to marine species.

Bet it was more succinct than mine

It's both. The population size is getting to dangerous levels where breeding can't occur fast enough to replace those that die. If it continues that tipping point will be reached. Once that tipping point is reached the species will be gone in 3 generations. No one knows when that exact tipping point will be, but we know that if the the current trajectory continues the Hectors will be gone. Unlike sheep we can't import more Hector dolphins to complement breeding stock. As the only species on this planet that can actually make a difference to the survival of other species I th

Because that's a legal definition for threatened species that has a decreasing population - it's really not that hard. They are a Threatened species, that are Nationally Endangered - which means if we don't stop doing what we are doing they will become Nationally Critical in the short term (5-10yrs). The Maui Dolphin are Nationally Critical - they are expected to go extinct. Generally speaking once something makes the Nationally Critical list it's usually a matter of when, not if, it becomes extinct. When a species hits the Nationally Endangered list, it's time to make some

You could do well to install a Victron SmartShunt. These can network with the Smart MPPT units turning them into a syncronised charger. The synchronisation occurs over Bluetooth. A boat I helped on recently had three chargers like you and they were all all over the place. By networking them to the SmartShunt they are now able to fully charge the LFP every time. We've set a charge voltage of 14.2v with a tail termination of 0.03C and it works a treat. Just need to confirm that the model mppt you have is compatible with the Bluetooth networking option...

LFP must have tail current termination if the voltage is held at any value above 13.35v. 13.9v will over charge a lfp if left for long enough. The Balmar 614 allows a timeout parameter to be set on the absorbation cycle, not paying specific attention to this value could result in over charging. Without doing experiments on the actual batteries to determine a safe absorption hold timer I could never recommend a value. Hence I suggest dropping straight from bulk to hold (aka float) and skipping absorb altogether. IMO it's not worth the risk. Charge to 14.2v then hold at 13

The 3way ensures that in the very unlikely event that all 4 bms's close the charge circuit that your alternator is still connected to a battery. The LFP profile will never fully charge the bow or start. So the dc/dc takes care of this. Eg, let's assume a quality group 31 ca/ca start battery. The charge requirement is 14.9v till the current reaches 2A. Then float at 13.2v indefinitely. While your LFP profile might be charge till the voltage reaches 14.4v (the balmar can't do a current termination) then hold (aka float) at 13.4v. So the charge profiles are incompatible wit

Oh yep. As you say these have BMS's built in. You can't get any signal out of them so no option to control the regulator. They are also MOSFET type BMS's so I do not recommend connecting a winch to them - although with 4 BMS's you'd probably be OK - but I would still not recommend it cause if the BMS's blow up you'd be pretty annoyed The key issue you face is that you cannot control the charge termination from the 614. It has no ability to detect the tail current and therefore you cannot safely fully charge from the alternator. My recommendation would be to: 1. set the 614

What BMS do you have? The BMS would shut down the alternator before it shuts off the charge circuit. Then the alternator won't get damaged. A solution which shuts off the alternator when charged is not great, but it is better than nothing. Ideally the alternator should be switched into a holding voltage of 13.35v once the LFP is fully charged. If the engine is still spinning you might as well use the alternator to power everything, including those DC/DC chargers rather than start depleting the LFP. But you can't do that with the 614. Likewise the solar should also be going

The issue with the Balmar regulator with LFP is that it can't do a measured charge termination. You'll either undercharge or overcharge your LFP it will never be right. The only way to fully charge LFP is with a measured charge termination current. Like you say, you need two separate dc/dc chargers to top off your Independant LA banks. You'll never achieve that with a LFP charge profile. What do you use the bow battery bank for? How many Watts do you typically pull out of it before a recharge?

Now surplus to requirements due to modifications to my LFP setup. CTEK 120S and CTEK 250SE Selling as a pair: $850 Includes: * Solar MPPT (20A) * Alternator to Battery 140A * Three CC/CV Profiles (20A) suitable for LiFePO4, AGM, PbC (Lead Carbon) or flooded LA * Suitable for 40Ah to 800Ah, but you realistically need 80Ah minimum to see a benefit from the 120S * Automatic low voltage disconnect for non essential services Happy to assist with install if you're Westhaven (or nearby) based for a couple of bottles of Rum. Can loan hydraulic c

Converting from 12vdc to 230vac and back to 36vdc is extremely inefficient. Unless you have excess energy to literally burn, you'd be better off getting a 12v to 36v boost converter. You'll possibly find the manufacturer even sells a correctly sized boost converter. If you're buying an inverter that needs a 10A circuit breaker installed on the AC side, then legally this must be installed by an electrician and include appropriate earth/neutral protection. If you're buying an inverter with a 3pin AC socket on it, then these use a isolated IT earthing system and do not need an add

https://www.doc.govt.nz/news/media-releases/2024-media-releases/doc-statement-sailgp-lyttelton/ DOC does not have a role in permitting or allowing the race to go ahead. The marine mammal management plan was developed by and belongs to the race organisers. DOC does not have a role in implementing it. SailGP has chosen to hold its event in a marine mammal sanctuary that was established for the protection of Hector’s dolphins.

Most cars have fusible links in the start circuit. I wanted a way to manually isolate. In the event of an emergency it might be the relay controller that's smoking or worse the bms... The switch also isolates the BMS negative. Unless the bms and balancing is cascaded (which is a stupid design) then you can't truly isolate a Lithium. Maybe with a 6pst switch 😂