I am currently starting a project
on our 2009 Leopard 40 catamaran
to either fix or replace our Northerlights M673 generator
or upgrade our solar
from 5 x 85w to 5 x 140w rigid (similar size to the current
5 x 85 that are 10 years old) + 2 x 175w semirigid on the coachtop and add high amp alternators
the reason is two fold - the powerhead on the generator
is broken, but the 630Ah Lifeline AGM battery
bank we have does get down to 60-50% DOD since our Ah estimate usage at anchor
is about 280Ah (pls dont reply "go on a power diet"). Its over 500 underway but can offset that with thge 80Amp Alternators.
the issue I would very much appreciate feedback on is battery
technologies vs cost and expected cycle life
I have watched numerous youtube videos on Firefly carbon foam on pacific yachts as well as lifepo4
on custommarineproducts and other brands of lithium and I must admit if am still very confused
seems carbon foam can also handle DOD down to 80% and still have a decent cycle lifespan
Lithium may last longer, but the upfront cost is about 1/3 higher at about $8.99/Ah Lifepo4
($899/100Ah example) vs $5.69/Ah Firefly ($660/116Ah example).
so if I have to buy 6 of these this would end up being about a $2000 difference. If I want to upgrade my usable Ah to perhaps twice that amount to be able to potentially run a soft start AC for the night for a few hours, then cost is significant and I wonder if it makes sense to move to LiFEPO4 vs Firefly.
is there any side by side neutral comparison of these two battery technologies that could help drive my decision?