Originally Posted by Bundyon
snip.... I know you don't want lithium, but if you were going to pay $900 for a good AGM
then I techworld have 120ah lithium (i120x) for $975 with a smart BMS that means you can pull your AGM's out and put the lithium straight in and use your existing charger
, This, after much tossing & turning is the route
Good luck with it all.
When helping a friend (with campervan, or in USA speak "RV"), we considered "I-Tech world" brand. Indeed not much more $$ than top of the range AGMs. But, the max number you can parallel is 4 batteries
, and you can never use them for starting an engine
(each 100 Amp/hr battery
can only safely supply approx 50 amp). When I asked them they could not, or would not tell what kind of lithium brand of cells they used in their products. We gave them a miss. At that time, we went with Lifeline.
I have myself 120 Amp/hr Lion AGM batteries, in theory very good, but noticed after 4 years a marked deterioration, so now I am too considering alternatives.
I guess two things need to be in place for a battery
to last long (ie beyond 5 years): quality battery and quality setup on boat
. And to add to that: a battery bank that is used every day by live-aboards, will naturally gets quicker to its designed charge/discharge-cycle than a system that is only used on occasions.
The only batteries I never any problems with and used regularly is a set of 4 Odyssey PC2150, now 9 years old (on my campervan). I just purchased 2 of these for my boat
starting batteries as well.