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I recently installed a small fridge in the back of my van and wondered what was the best way to connect it up as I didn't want to end up with a flat engine battery.
Having Googled the subject I found a site that sells what is known as a 'split charge relay'. I emailed the firm (www.brocott.co.uk) who explained how it worked. The 'voltage sensing relay' is connected between the main engine battery and a second (leisure) battery that I have since installed in the back of the van. When the engine is running, the voltage sensing relay allows charge through to the second battery, via the main battery but only as much as is required, then it switches off. It monitors the battery voltages and allows charge through when needed.
The nice thing about this relay is that once the engine is switched off, the 2 batteries are isolated so there is no chance of getting a flat main battery. Furthermore, the installation of the voltage sensing relay is quite straight forward and you DON'T have to mess about with alternator connections or ignition wires, so very simple indeed. Now I can run any additional appliances from the leisure battery and not worry about a flat...
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∙ 14y ago
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