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Voltage Sensing Relay Kit, Intelligent Self Switching Split Charge Relay Kit 12V / 30Amp

£22.95 (inc VAT) £19.12 (exc VAT)
Usually ships the same day
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Product Description

This voltage sensing, self switching split charge relay is used for charging a second battery from your main vehicle (crank) battery. This relay is different from other standard split charge relays in that it does not require an alternator connection or an ingition switching point - it just connects between the main & auxilliary batteries. No over charging can take place and also does not interfere with the normal charging that takes place between your main battery from the alternator and wont leave you with a flat.


Safety First!


The most important part of a circuit is the FUSE! So make sure you install them with the kit. We supply 2 auto fuse holders & 2 auto fuses with our kits.... Why? Double the protection! We protect our kits on both sides of the Self Switching relay. The 1st fuse point is installed a few inches away from the main battery positive and the second fuse point is installed a few inches away from the leisure battery positive. This give you double the protection in the event of a short circuit.


Suitable for any 12V negative earth vehicle, where a second battery needs to be charged


Example of use: If you install a second battery in your vehicle for running additional appliances and need it to be charged from your vehicles existing system. The relay kit is connected between the vehicles main battery (Positive) and the second battery (Positive).


The Benefits...


  • Connects straight to the main battery + terminals
  • Fridge Output Facility
  • No possibility of the second battery overcharging
  • No possibility of the relay kit causing main battery drain
  • Voltage activated
  • No alternator connection required


What's Included...

  • Intelligent 30 Amp Split Charge Relay Kit (Self Switching)
  • 4 Meters 2.5mm 30amp Cable
  • 3 x Ring Terminals
  • 2 x Auto Crimp Fuse Holders
  • 2 x Auto Fuses
  • Fitting Instructions
  • Full Telephonic Technical Support


Heavier duty relays are available if required. We have recently released the 80 amp and 125 amp voltage sensing relays

Product Reviews

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  1. Excellent - Does the trick

    Posted by Ken Smith on 22nd Jul 2013

    Does what it says on the tin. Prompt delivery, everything you need and good value for money. Seems to work well up until now - will let you know if things change!
    A small improvement could be to increase the size of the crimp terminals (hole diameter).

  2. Good product and service

    Posted by Paul on 29th Mar 2013

    Found this relay to ensure my motorhome leisure battery was automatically charged from the main battery, and was exactly what was required. Received quickly, and would have been very simple to fit, had I not realised rather late that there was one already fitted... Oops. Brocott were extremely helpful in taking the unneeded relay back. Would recommend this relay and Brocott's service.

  3. Excellent Product

    Posted by Victor on 17th Sep 2012

    Excellent service and product. Would recommend this product