To get 12V from your battery system is not hard, and do remember that 12V devices are optimal @ 12V.
From 24V Battery system, get a 30V>12V and from 48V battery system get 60V>12V. The reason for the Higher Input Voltage is because when you are charging you can hit that voltage and do not want to fry the converter.
! DO NOT USE POTTED Buck-converters like this, they are crappy and when they fail, they fail open, so full voltage goes through !
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There are several options available to you at various price points because it depends on the voltage you are stepping down and how many Amps output you require for your 12V stuff.
- Installation is AFTER the SmartShunt so that this is also seen as a load coming off the battery bank. If you tap off the common DC Bus, the power used by the converter & 12V devices will not be registered & seen.
- The Converter should certainly be fused as well. This depends on it's requirement related to the amps it outputs.
- Most typically, the converter would be attached to a 12V Panel / Block like these below so that each device is also fused. *WARNING* use only High Quality fuses, many knock offs are not compliant (especially motive types)
https://www.bluesea.com/products/category/16/61/Fuse_Blocks/ST_Blade
Depending on how many 12V Amps you have to deliver will help to recommend what converter to use and also if this is Marine, RV or Stationary.