Battery banks set-up

[Nidnoi_V]

*Hi All

all*batteries*are based on*LiFePO4

I¨m seeking your Advise; I’m about to convert a*Catamaran*to an*Electric*/Hybrid. With this setup, I will be able to use my*motor*between 4-5 hours depending on Seastake, etc. or pure*electric, which means I can save roughly 20 Liters or 17 KG per usage
However, I will also have things running on 12/24, which my Idea is to make a Secondary*battery*bank on 24V, running fan, light,*navigation, etc.
For A/C appliance and*propulsion, I would have 28Kwh at 48V DC

1. Solution 1

3*Battery*banks

a. 48V Battery bank running with 600 AMP or 28. KWh weight 250KG
b. 48V Battery bank running with 600 AMP or 28. KWh weight 250KG
c. 24V Battery bank running with 1200 AMP or 14.2 KWh weight 165KG
Total Weight 665 KG

2. Solution 2

2 Battery banks

a. 48V Battery bank running with 750 AMP or 35.5 KWh weight 312,5KG
b. 48V Battery bank running with 750 AMP or 35.5 KWh weight 312,5KG
Total Weight 625 KG

I¨m aware I will need DC/DC converters from either 48 to 24/12v or 24/12V
My concern is here how much AMP hours will I lose when downgrading to 24/12 V
For*Charging*the*batteries, the following*installation*is made 2800 watt*Solar*power plus also regen from the Electric Engines when sailing for sail