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4QD motor controllers
for battery use

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Instruction manuals Specifications and features Questions answered
Service and fault finding Wiring diagrams Application notes

4QD summer closures

4QD will be closed from midday Friday August 15th 2014, reopening Tuesday August 26th. Some technical support may be available during this period.

4QD will also be closed from midday Friday September 5th 2014, reopening Monday 15th.

Welcome to 4QD's home page.

4QD manufacture electronic motor speed controllers for battery operated electric motors.

Quick Site Index.


New product soon to be available

NewOur established and proven Battery Condition meters are being re-designed. The first one is our 5 LED 24v battery meter which is about to become a postage stamp sized board.

The existing meters are still available.

Recent additions

Our latest Programmable controller: called the Prog-150, this uses digital technology and includes the programmer. Details are available.


Sales section


Information section


Service Section


Miscellaneous Section


Large Site Warning

There is a lot of information in this site, which is one of three 4QD sites: if you are interested in the information on offer you will surely need to bookmark it for many return visits! The size of the site means it can get difficult to find things - especially if you do not know what the site contains!

The site is therefore divided into commonly used areas - but there are more not-so-common areas, so do keep reading!


Page Information


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© 1996-2014 4QD
Page's Author: Richard Torrens
Document URI: www.4qd.co.uk/index.html
Last modified: 2014