Hi Owen,
I bought some agm's here; http://www.batteryconcepts.net/yuasa/ub121100.html
One of the batteries went bad shortly after installing. The company honored their warranty and replaced the battery at no charge. Good price, I'm pleased with them.
Mark
Santa Cruz
--- In electricboats@yahoogroups.com, "otyers" <otyers@...> wrote:
>
>
> I intend to convert my 27' 7000lb sailboat to electric over the winter.
>
> I've been reading on this group that lithium batteries should have a
> ~2,000+ cycle lifespan compared to ~750 for AGM, but I've also read that
> one should only expect batteries to last 5-7 years. Does this 5-7 year
> life expectancy also apply to lithiums? If so, it would appear that one
> would need to more or less discharge the lithium pack every day for it
> to make sense (365 days x 5-7 years = 1825-2555 cycles), otherwise the
> capacity for these extra cycles would not get used.
>
> For those of us that are lucky if we get out on the water 30-50 days in
> a year (a range of 150 - 350 discharge cycles over a 5-7 year period),
> what battery type would make the most sense? Also, any tips on where
> to source these batteries inexpensively?
>
> Thanks for any advice.
>
> Regards,
>
> Owen
>
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