There is a fellow down in Port St. Lucie Florida that has launched a 100ah LiFePO4 with a 10-year warranty for ~ $550usd each. I saw his shop in person when I purchased some solar from him and was quite impressed with the work they've done and the research and testing that has gone into their products. I had already purchased my batteries by the time I discovered his product or I would have purchased from him: https://outlandsolar.com/
My partner and I live aboard a 41ft sailboat and both work remotely as programmers. I installed 1920w of solar on the boat and get approximately 3.5-4.5kwh per day in output, depending on which way we are oriented while at anchor. I installed 600ah of LiFePO4 batteries @ 12v and when combined with that amount of solar, we have pretty much all the power we need. We frequently cook with an air fryer and have a dishwasher on the boat that we run daily-- all off solar.
I ended up mounting two ~39x70in panels on top of the davits and one on each side of the stern, mounted to the stanchions like 'wings' that can be propped up while at anchor. Strangely enough, I found I was getting so much power from the panels that I don't bother propping them up. Because of the way the panels are mounted (basically at least 1 panel facing the sun at all times), I'm able to get roughly 500w from 8:30am until just after 5pm. I was pleasantly surprised.
I'm pretty sure they're Sinopoly cells, but I'm no expert. The BMS they use is quite impressive too, from what I could tell. While I was there in the shop they had a battery cut open and I was able to see inside.
Will prowse has a link to the vendor he chose in the youtube video description, if you search for "supplier" in the forum you'll get plenty of feedback on various known vendors.
I chose one (after sending a few private message to forum members) but I'm not recommanding it until I get and test my batteries.
My dad gave me Will Prowse's book as a resource when I was rigging my van with solar - it was a great read but not a necessary buy because all the info you need is on his website.[0] His YouTube channel is a great resource that I'd definitely recommend! Interested to hear what the brand is if your tests turn out satisfactory.
