For my new to build boat, I will use a dual voltage system. 12V for the engine
(starting & controls), 24V for the house bank (with 12 DC/DC convertors for the nav equipment
, and few others that need 12V). My boat is being built in South Africa
, and most lights, fans, water
makers, etc. are all available in 24V.
I made some basic calculations to dimension batteries, chargers etc.. I made use of the calculation tables that can be found on the web, or in books
like the ones by Nigel Calder.
Based on everything in 12V I would use about 260 Ah in a 24h period.
For 24V that would be 130 Ah in a 24h period.
To be on the safe side I would take a battery
capacity at 24V that is three times the max consumption
in 24hrs, so 3 x 130 = 390, so take 400 Ah.
Does this look right so far?
Now for the 24V alternator
, I am planning to take a 100 - 150A marine alternator
. Would that be the right size for a battery
bank of 400 Ah?
Also could anyone point me into the right direction what I would need in solar panels
to effectively keep my batteries charged when I leave the boat in the marina for a while?
Thanks in advance,