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Electrical Systems 101

New to boating or would like to understand more about what systems you have?

At first electrical systems onboard a boat can seem complex and confusing and that's when the boat is new! Add a couple of owners and several years of upgrades into the mix and could end up with a really complicated setup. It doesn't have to be this way, and you don't always need a professional onboard when something is working quite right. 


Learn what you have, how it works, and pick up some extra skills along the way!


This first video goes into some of the basics and what you might find on board your boat. Just a couple of really important points:


  • Don't play with mains voltage! - We're not coving 110-240v ac. We might talk about a charger but wiring anything on the AC side won't be covered.
  • Be careful with any test equipment and read the manual first to avoid any damage to yourself or your equipment
  • Know how to shut things down before you do anything - Where is the isolator switch?



This video builds on the above with practical examples of how to use test equipment, what equipment will give you better battery information and help you understand what's going on and we tackle an issue we have with our Adverc battery management system. 


Essential equipment to have onboard:

  • Basic digital multimeter
  • Electrical tape
  • Wire cutters
  • Wago connectors or terminal blocks
  • A small amount of wire


Nice to haves:

  • A battery monitor
  • Ratchet crimp tool and a selection of connectors
  • Heat shrink
  • Soldering iron

12v System Diagram

Allegra has a fairly standard setup, a dedicated engine start battery and two batteries in the house bank to power all systems onboard. Charging is done from the engine alternator via a split charge diode, a Victron MPPT solar controller and a fold-out solar panel when at anchor and mains powered battery charger when at the dock.


Battery charge status comes from a Victron Smart Shunt. The Adverc Battery Manager helps to compensate for the voltage drop across the charge diode by taking a reading at the diode and another at the house battery terminal. It then controls the alternator output to maximise charging.

Solar Charge Controllers

We recently changed from a PWM to an MPPT  Solar controller. What do these terms mean and which is best?

Battery Charger upgrade

Victron Blue Smart IP22 12v 30amp review and installation

In this video we take a look at the features of this charger and also some of the information that can be monitored from it. We remove the old charge and install this one and we also connect this to the rest of the Victron kit using VE Smart Networking. This allows the charger to understand the voltage and ampage at the battery and modify its output to match the charge profile.



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