To be fair, most of those circumstances would be either extremely dangerous or destroy your battery bank even with lead acid, so it's not a bad thing to shut things down. A yacht will probably survive without power while the systems are fixed. It's more than likely some kind of short or temperature event which would cause this, both of which can be corrected to restore power.
How do those figures look if the units are £/year/AH. You cannot ignore the shorter service life of lead acid. My calcs came out at 55p/AH/year for Lithium and £1.40/AH/Year for AGM. That's quite a difference. Both were Victron batteries to make it more fair, and both were packaged batteries - not the best way to buy LifePO4. I assumed a safe 80% discharge on the Lithium and kept the lead at the recommended 30% max discharge for service life, which was 7 years while the Lithium was 25 years. If you deep discharge to 50% on the lead it goes to 82p/AH/Year but then you're praying to get 7 useful years of life.
You picked the most expensive lead acid AGM battery money can buy! An AGM battery designed to take at least 300 100% DOD discharges! Hardly a run of the mill lead acid battery. Its also designed for high loads that contradicts your statement that lead can only supply power over a long period of time. Its specifically capable of dealing with bow thrusters and windlasses. So taking a more normal quality lead acid battery such as a Trojan your figures look a lot less attractive. You have also not allowed for the alternator safety features needed when using lithium. At least you have posted some figures?
Can you back that up with any evidence or is it your opinion ? I would guess (but could be wrong) you didnt watch the video i posted as you champion agm whereas the video demonstrates what a waste of money they are .
The interior certainly is appalling, especially when put in the context of the Uma interior which I think is one of the nicest I've seen for a couple. I'd certainly like their work area and galley with the hefty susan
I think this boat gets us to a point that it's extremely practical for weekend sailors and very practical for coastal trips. When they sell a few hundred in West coast USA they'll no doubt improve various aspects of the design. With a bit of luck Dan and Kika will give them some interior tips too!
I watched the video twice. I don’t champion AGM. They are a waste of money. I run open lead acid Trojan deep cycle batteries at the moment. Evidence has already been presented on lithium cost by Dunedin. I am not arguing with thatCan you back that up with any evidence or is it your opinion ? I would guess (but could be wrong) you didnt watch the video i posted as you champion agm whereas the video demonstrates what a waste of money they are .
Im no expert but the way the batterys were tested seemed pretty fair to me ..
If nothing else some of you have produced great info from both points of view and a great thread on li v lead acid
As for the boat, its a great concept that for some would certainly work.. (but i think the interior is appaling) ...
No they didn't. There was no link and no information about the workings, and the numbers didn't include service life.
Try this
Solar will not get you very far in propulsion terms.
If you like the maths you may enjoy this video and he has made all his research available for anyone who wishes to download it. Usual caveats apply. Link to You Tube video on battery research
The guy in the video is a renewable energy engineer. He specialises in this field as a consultant and systems designer. He doesn't sell batteries so is independent with no axe to grind. He is not trying to sell batteries. He has three degrees in relevant fields. Renewable energy, energy technology and mechanical engineering.
I wasn't questioning your post, just saying the figures don't inlude lifespan so don't give a good picture. Unfortunately I can't get the magazine locally and these days it's not really worth hunting for as all of the news is out of date and all of the boats in the ads have sold so that leaves the few repetetive articles. I do buy a copy on the way to the boat usually for idle reading.
Yet he (and you) didn't show any kind of workings or sources, and somehow quoted a bunch of figures completely at odds with most peoples experience and most other sources.