Here are a series of posts documenting my experience with exactly the same upgrade.

In a nutshell, 175w of solar and 200ah of lithium house bank allowed me to be off the grid May and September. (Toronto area, fridge running). I think this is a perfect size for a 32-37’ boat, similarly equipped. I sold windstar last year and the new owner told me that her marine electrician checked the installation and told her it was ‘done right’. I’ve upgraded my new boat to LiFePo and wouldn’t think twice about it, unless perhaps I had a requirement to charge the bank in freezing cold.

The loads and use cases I considered are all documented on that blog.

Dave

Ex- 33-2 Windstar

Sent from my iPhone

On Feb 16, 2024, at 6:04 AM, nausetbeach--- via CnC-List <cnc-list@cnc-list.com> wrote:

Chuck, Bill and any others:

I am in a similar position; my batteries are on their last legs. Was hoping to make another season with them but need to dive into LFP batteries as a potential replacement. Some people really like AGM, but my understanding is they need to be brought back to 100% SOC and I am on a mooring so cannot just plug in at the end of the day.

Where / what sites have you been using to learn about LFP batteries? So far I have looked [but need to spend more time at] Rod Collins “Marine How To” site, and Ocean Planet.

I also need to get up to speed as best as I can on solar – so any suggestions there as well. Have spent some time on the “alltestore . com” site.

Thanks,
Brian

From: CHARLES SCHEAFFER via CnC-List <cnc-list@cnc-list.com>
Sent: Thursday, February 15, 2024 6:15 PM
To: Stus-List <cnc-list@cnc-list.com>
Cc: CHARLES SCHEAFFER <cscheaf...@comcast.net>
Subject: Stus-List Lithium vs AGM

Hey Bill,

I am replacing my 12 and 13 year old AGM batteries with AGMs. I spent at least 40 hours this winter learning about Lithium, because decent lithium batteries can be found for a few dollars more than AGMs. But I don't have room on my boat for the inverter/charger and all the costs of that and all the modules and cables, required to complete a system like that, pushes a lithium project way over my budget. I am installing a Victron shunt to read my power useage and monitor various loads, and I'm adding some fuses at each battery, so I can always upgrade the system later, if it's warranted.

I'll be adding a cheap 1000watt pure sine wave inverter to power my TV, DVD, chargers and coffee maker.

Curious about your project.

Chuck Scheaffer, Resolute 1989 C&C 34R, Annapolis

On 02/15/2024 4:27 PM EST Bill Coleman via CnC-List <cnc-list@cnc-list.com> wrote:

I'm a little surprised, I would have expected a progressive fellow such as yourself to be jumping into lithium. I am wasting an inordinate amount of time researching charger inverters, and I think although the lithium batteries may come down more in the future, I think because I need new batteries the time is now.

Bill Coleman

On Thu, Feb 15, 2024, 12:34 Joe Della Barba via CnC-List <cnc-list@cnc-list.com> wrote:
I recently got a big AGM battery that needs a big charger. I have a ProNautic 15 amp charger with a battery temperature probe that is necessary for correct charging of any lead-acid battery. It can charge 1, 2, or 3 batteries and has a lot of settings for various charge profiles.
It works fine, it is only being removed because I got a bigger charger. They sell for $350-$400 new, I will send this one to any USA address for $150 shipped. Canada might be more, I would have to check.
(Odyssey battery company told me they want their battery charged with at least a 30 amp charger and ideally a lot more, apparently they need to be hit hard to stay good)

Joe Della Barba
Coquina C&C 35 MK I
Kent Island MD USA

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Stus-List Re: Lithium vs AGM

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