I have a quick question about batteries
for a new boat
(48 ft power motor
boat). The boat
is 24V, only the generator
start and the thruster are 12V. It is a fairly heavy load boat
with multiple fridges, windlass
, bow thruster, two engines and a generator
toilets, electric galley
, AC. The last two are not to be used on battery
power. The charger
is 50A 24V, the alternators are 2x 120A.
Originally the boat had five banks with separate banks for engines, generator, house, SSB
I always thought that golf cart batteries
are the way to go and in the US the cost works out to approx. $100/104Ahrs @ 12V (1 unit), AGM
being 3x this cost and Lithium being 5-7x this cost. Apparently things have changed. In Greece
, the wet cell golf cart batteries work
out to $200/unit which means $800 for a 24V bank @ 208Ahrs plus a lot of cables
to interconnect. For comparison, one can buy 24V @ 150Ahrs Lifepro for double that price
with BMS included, only two physical batteries.
So, it seems that in this particular market Lifepro is not that expensive. The question is, do you believe 150Ahrs @ 24V is enough to run a powerboat? I calculate that on a powerboat you have a lot of loads but also a lot of sources (alternators and generator), so there will be frequent charging
and discharging. Lithium seems to handle such situations better than wet cells.
So, if you could get 200 Ahrs @ 24V wet cells vs. 150 Ahrs Lifepro for double the price
, which one would you choose?