Knowledge Centre

This area of our site is devoted to unraveling the sometimes mysterious world of auto and marine electrics by providing you with useful guides and resources to help you in your wiring projects.

Because Knowledge is Power!


12 Volt Frequently Asked Questions (FAQs)

In this section are answers to many of the commonly asked technical questions related to 12 volt wiring. Use this as a quick reference to save you time when deciding what parts to select for your project...Read more


Electrical Circuit Basics

Electricity is a fundamental part of the workings of most vehicles and this section aims to explain the basic principles. Hopefully this will give you an understanding and allow you to carry out some simple calculations for specifying the electrics in your auto or marine wiring projects...Read more

Cable Sizing & Selection

One of the most important aspects of any wiring project is determining the correct size and type of cable to use for each circuit. Too small a cable size and you'll run the risk of generating heat in the cable; too large and you'll be wasting money on copper you don't need...Read more

Fusing Guide

Fuses are critical in any electrical system and are used to protect a circuit from excessive current that could lead to damage and, very often, an electrical fire. Excessive current is most likely to be caused by three things...Read more

Relay Guide

Relays are used extensively throughout all modern vehicle electrical systems. They are quite simple devices but very useful, so once you understand how they work and what they enable you to do it opens up a vast range of applications for your aftermarket projects...Read more

Split Charging Guide

If you own a motorhome, campervan or boat then you'll probably need a 2nd battery to run all of your leisure electrics such as lights, coolbox/fridge, TV, navigation equipment, power sockets etc. In order to keep this 2nd battery charged you'll need to connect it to a power source such as your engine's alternator or a mains battery charger. This is what split charging is all about...Read more

Auxiliary Battery Charging In Vehicles With 'Smart' Alternators

One of the emissions-reducing technologies that is now becoming standard on new vehicles, is  the 'smart' or 'intelligent' ECU-controlled alternator. Unfortunately traditional split charging systems using VSRs are not compatible with smart alternators so a battery-to-battery charger must be used instead...Read more

LED Lighting Brightness Guide

Conventional lighting based upon incandescent filament bulbs is traditionally referred to as having an output in Watts. This allows us to have a good understanding of how bright it will be as there is an approximate correlation between power consumed by the bulb (Watts) and brightness.  The problem with LEDs is that they use much, much less power than conventional bulbs for an equivalent light output, so using Watts as a measure of comparing brightness is no longer useful...Read more

Cable Size Table

If you are struggling to work out your old cable size we recommend looking for any markings on the outer insulation. These may be an Amp rating (ie: 20A, 16.5A) or a number followed by mm² or AWG. This will enable you to match the specifications of the cable like for like...Read More

Solar Power Guide

Solar panels are a great way to harvest clean, free energy from sunlight & are quickly becoming commonplace on rooftops around the world. We often have customers ask what panel is right for their application so in this article we will cover the fundamental workings of solar panels...Read more

Leisure Battery Guide

Deep-Cycle Leisure batteries are the heart of your electrical setup, distributing power to all of your equipment. Different from vehicle starter (or cranking) batteries that deliver a large amount of current over a short period of time, deep-cycle batteries (also known as leisure batteries) are designed to deliver smaller amounts of current over long periods... Read More

Voltage Drop Calculator

Use our Voltage drop Calculator to work out the best cable size for your 12 Volt project...Read More

Campervan Conversion Electrical Checklist

If you're new to the world of 12V Electrics then it can seem daunting, but taking some time to understand the different elements of an electrical system and what they do can really help bring the pieces of the puzzle together.

If you're about to start a conversion for the first time, this article is for you...Read More

Mains Battery Charging

Battery chargers are essential to any 12V electrical setup, allowing you to replenish the charge that is drawn from your battery by your 12V circuits. In this guide, we will walk you through the various things to keep in mind when choosing a charger...Read More

Upgrading to lithium batteries

Lithium batteries are becoming more popular in the leisure market and many people are looking to upgrade to this more efficient technology. In this guide, we will walk you through the basics of lithium batteries and look at what you will need to make sure your set-up is suitable for this upgrade...Read More 

Crimping Tool Guide

Cable crimping is the cornerstone of your 12 volt electrics, but which tool is best, and why are there so many choices? In this guide, we will show you the different styles of crimping tools, the benefits of each and the best way to crimp your cable...Read More

Guide To All-In-One 12 Volt Wiring Kits

All-in-one 12 volt wiring kits are extremely popular with a lot of newcomers to DIY campervan or motorhome conversions. However, even though they are designed to simply plug-&-play there are certain things to be aware of... Read More

Terminals & Connectors 

Used throughout 12 Volt applications terminals and connectors are one of the most important products in your build. In this Guide we walk you though the different types of connectors and there uses...Read More



The information contained in these articles is provided in good faith and we do our best to ensure that it is accurate and up to date, however, we cannot be held responsible for any damage or loss arising from the use or mis-use of this information or from any errors or omissions. The installer is ultimately responsible for the safety of the system so if you are in any doubt, please consult a qualified electrician.

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12 Volt Planet

12 Volt Planet

Auto & Marine Electrical Components