Hey all. Sorry for the delay in replies. We've been out cruising with limited access to internet. I'll go through and answer comments below, but it appears several questions have come up about the cost of the project. Here it is in USD:

As an engineer I really really enjoyed the nerd speak. I love listening to the thought process and you listing the specifications. Great video.

Awesome, Great explanation of why and what. Thank you

Wow, a lot of very basic - but not thought about issues I gained insight about from your video report. Thanks you so much. I am looking to buy and restore / upgrade a catamaran in the near future - so again, thanks for your insights

Very eloquently presented and easy to understand. Can't fathom why cat manufacturers are not offering lithium as standard, as this is the only way in the future.

Outstanding video. Clearly not low cost; but, if you are needing a change anyway, having a long term vision is important.

All of these issues are common basic troubleshooting and complications normally experiences and air models flying over the past 40 years or more! Good video! Abec, speed controller, gps, charger, amperage and telemetry, all the same.

Keeping lifepo 4 batteries at a topping level of 90% increases their life span as too does keeping the bottom at or above 30%. So the total available AH increase when these two charging points top and bottom are taken into consideration for longevity is only 10% over LABs. This is important on marine applications as most are not going to be running the air conditioning all the time to keep their batteries at the 72-74 degrees F recommended for good life span. At 92 degrees F the lifepo 4 batteries lose half their life expectancy. So the number of EXPECTED charge cycles is going to drop dramatically with increased cabin temperatures (in your case). The issues with charge rate times is a great point for those without a large generator and even those with one to get a high end wind generator (or two). While it is true that the wind does not always blow, it does a better job IMHO than a sun that too does not always shine. Let's face it, we are wind driven bunch here. We go when the wind blows unless one enjoys burning fuel. In that case, a sailboat is not the smartest decision anyway. So again IMHO the only two real selling points for lifepo 4 batteries are lighter weight and lower volume pr AH, and ability to get in a faster charge rate. Unless you are planning to keep the storage area they are in at 72-74 F AND keep the charge levels between 30-90% you will never see the advertised charge cycles from them. In that event the value takes a rather serious hit for people whose storage area is regularly in the temperature range of the low 90s (F). On many boats that is a daily occurrence in many cruising destinations. In addition to that, because you chose to string together 3.3V cells (as many have) you had the added expense of a high amperage 3.3V parallel charger. Many do not understand this issue as Winston is the only 3.3V cell provider who I have seen bother to explain the need for parallel charging on these systems. The better 12V platforms have automatic cell elimination built in should one of the 3.3V sub cells go on the fritz as well as onboard 3.3V parallel charge circuiting and independent cell charge monitoring. However 100 AH is going to run you 1,200 dollar or so. There you would have been looking at 8,400 USD (before shipping and taxation) for 700 AH of storage but would have eliminated the complexities of the external parallel charging circuits and independent cell monitoring boards. Even if an entire 12V bank goes down on you there you could always eliminate it and just run on 600 AH until a replacement is gotten. However, overall I think you did a very fine job there with what you used.

Great video.Batteries are so important for full time live aboards. FYI Tesla recommend that you charge your Li batteries to 85-90% to extend the life of the battery pack. If you have a long trip then you go to 100%.

One thing to remember with any lithium batteries is good charge control , some types are worse than others but if a battery combusts, most likely it will be impossible to extinguish until it has expended its considerable energy.

Good presentation of possible problems and solutions.

Super helpful. Thank you very much for the details and lessons learned.

The interference caused by the battery cables can be avoided by two options: use shielded cable or twist the positive and negative cables around each other to disperse the electromagnetic field. I would love to see statistics on your usage.

Great video and even better description with useful and complete references. Thank you for sharing.

You should get a Phasor/NegGen 3.5 kw to fill that old battery space(If it will fit). It would allow you to run at least one air conditioner all the time and do other stuff instead of burning the big one to stay comfortable. They use about 1/5 a gallon per hour, and all day can be done on about 4 gallons of fuel. With a place to live away from the heat, which is what I really hate sometimes as fans don't always cut it! I am getting 10 Firefly Oasis carbon foam batteries for my boat. They will set me back about $4300, but do give a full 1100AH as opposed to regular AGM at 50%. They also don't need to be topped up generally and can stay at 50-85% all day everyday for the most part. Since they are going on a monohull, it really doesn't matter that they weigh about the same as AGM. I wanted lithium, but for 1100AH I couldn't handle changing all my circuitry, and the install would have easily set me back 14-18k. These batteries with a bank this large should give me close to 10 years of performance and within 80- 90% of a lithium bank longevity. No matter how many cycles the manufacturer tells you the battery will take...regardless of the number of times they are used age will take them down anyway as the chemical makeup degrades.

Great video as usual guys, good clear explanation David, sounds like you have taken the time to learn and understand quite a complex lithium solution. Fair winds guys.

Thanks for the practical view. I think this was your best post.

After eight years my lead/acid power system was starting to wane so I decided to replace the entire system. My power needs are much different than yours, but I thought would post a breakdown of my cost for giggles.

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well thought out project.....also Peace of Mind is Priceless......thanks for a great video.....from texas....