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I read your comments
with interest. We are full time sailors, and we too are still
unconvinced lithium technology is for us because of the same
reasons you mention. I think you make very good points. But, I
would like to add two more. First, the insurance industry
needs to catch up on adoption of the technology. It is already
difficult to maintain insurance, so why add another component
that might make it even harder still. Second, it seems to me
that one of the goals of a lithium upgrade is to not run the
generator. Not running a diesel engine is bad for it. Diesel
engines like to be run, and they like to be run hard. This is
Sailing Vessel -
Cream Puff - SM2K - #275
cruising - French Polynesia
On 4/28/2022 8:54 PM, Alan Leslie
[Edited Message Follows]
I have been following these Lithium threads with great interest
as i really thought that with the cost of LiFePO4 batteries
coming down, and the advent of "drop in" replacements for LA
batteries, perhaps the time had come to seriously consider
replacing our aging AGM bank with Lithium.
BUT, reading all this thread so far, I'm now no
Our 660Ah AGM bank has performed well for 6 years - but we look
after it really well - balancers on each battery string, never
discharge to less than 85%, 600W of MPPT controlled solar.,
externally regulated 175A alternator (with a field disconnect
switch to prevent over charging), always plugged in at the dock
Two concerns I had with Lithium were, the peak discharge rate
required by the bow thruster and this sudden BMS disconnect
issue...perhaps a hybrid AGM/Lithium bank could address those
issues, but it all seems to be getting incredibly complex...and
not very clear as to how to manage it all....especially when not
on the boat.
By contrast our 660Ah bank of AGMs has none of these issues -
nor do we have the listing issue pointed out by a few, caused by
the lack of mass of the Lithium bank.
Our system is simple to manage and has worked really well over 6
years. It is only just now starting to show slightly reduced
capacity - but there's still plenty.
Mind you, we're not great fans of aircon, nor are we interested
in having an induction cooktop, so our needs are relatively
modest by what seem to be modern standards / requirements.
Also, sailing in remote parts of the Pacific, as we are want to
do, brings up the constant issue - what do you do if it goes
wrong? and that applies to everything on the boat.
Of course if you never stray far from your home port, or
frequent the Western hemisphere only - and have plenty of money
- then maybe these things are not an issue.
My aim has always been to be able to keep the boat going,
wherever we are - that is essential for us.
Maybe I'm just considered an old-fashioned sailor these days -
certainly approaching the "old" part - there was a time when I
was "ahead of the curve" on all this stuff, but that seems to
have changed !
So, while I am impressed with the technological advances spoken
of here and admire the courage of these early adopters, I now
think that when the time comes, I will probably replace my old
AGMs with new AGMs - for another 6 years...
Addendum : and when I read things like this : https://nordkyndesign.com/charging-marine-lithium-battery-banks/
It makes the whole idea of Lithium even
more scary and difficult to control..and while they say you will
get many more years...will you really?