General electrical information

General Electrical Information  Thailand

General electrical information

This List of information is provided by us as general knowledge and is used at your own risk. The below booklet is a GREAT read.

Energy Unlimited

Electricity plays an increasing role on board yachts. Modern navigation and communication equipment depends on it, as well as the growing list of household appliances that are taken on board.

This is the concept for a booklet about electricity on board small and large yachts. The intention of the book is twofold:

Firstly I try to cover in depth a few matters that over and again are subject to discussion and misunderstanding, such as batteries and management of batteries, or electric power consumption of refrigerators, freezers and air conditioning.

My second intention is to help designers, electricians and boat owners to decide on how to manage and generate electricity on board. Several new products and concepts have substantially broadened the range of alternatives here.

Together with some unavoidable theory, I use examples of small and large yachts to clarify the consequences of choosing one alternative or another, The consequences are sometimes so unexpected and far reaching that, writing it all down, I have also helped my own understanding.

(Reinout Vader)

PDF copy of Energy Unlimited
Battery SOC by Voltage (Lead acid only)

General Battery Information


This Chart for 6, 12, 24, and 48 volts shows you the State of charge for the battery bank based on the voltage, This is always very accurate it tells you when the bank is full or partly discharged based on the CURRENT available ACTIVE PLATE area in the battery (active plate area means the usable area or what’s left of the active material as the battery ages there is less and less active material available), as long as you have let the battery bank be at rest for a min of 30 min, Keep in mind that if your battery banks voltage is say 12.9 when fully charged then adjust these tables by adding 0.2 volts to them, the fully charged voltage can vary depending on the chemistry used in the battery.


Never mix old batteries with new or different types of batteries


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General Electrical Information  Thailand