For 800AH in AGM I am looking at 4 US AGM 185 batteries for a total of
$2000 and a weight of 600lbs. That would give me 280Ah of usable
battery at 50%DOD and charging back up to 20% while away from dock with
alternator on inboard diesel. I think it would take me about 3 hrs of
charging with a 100amp alternator to get from 50% dod to 20% dod (is
that correct?).
Looking at LIFEPO4 Sinopoly 100Ah batteries it would take 4 in series to
make 12V, then could use 16 for four banks of 12V for a total of $2160
and weight of 112lbs. That would produce 640 usable amps at 0% to 80%
discharge. Or 480 usable amps at 20% to 80% discharge.
My questions are:
What rate of charge will the LIFEPO4 batteries take? (do they require
float charging as AGM's do)
Can I use a normal 12V 100amp alternator to charge these?
Would it be better to series all 16 for a 48V bank, get a 48V alternator
for the motor and then use a DC/DC converter to get back down to 12V for
my house loads?
I have a 4 bank charger designed for AGMs, What type of charger would I
need to handle LIFEPO4?
My understanding is the LIFEPO4 batteries give you at least 2 times the
cycle life, way less weight, more usable amps via deeper discharge, no
self draining, no issues with sitting unused at less then full charge,
but way more cost. (although in this case less then $200 more for the
same capacity)
Am I missing something important/costly?
William
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