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Split Charge FAQs

Q Can I use a solar panel with a VSR?

It is not recommend, VSR's work by detecting a charging voltage on either the starter or leisure battery as a solar system will always produce a charging voltage when light is present it will activate the VSR and share the charge between the leisure battery and the starter battery. 

As a result, when you start the vehicle the starter motor will draw power from both the starter battery & leisure battery. Over time, this type of usage will damage your leisure battery as it is not designed for the high draw requirements of the starter motor, so you will likely find yourself changing your leisure battery more often.  As a DC-DC charger will only work from the starter battery to leisure battery they are a much better option.

Q Do I need to connect to my alternator?
A No, all modern split charging systems including VSR's can be taken directly from the starter battery. 
Q What size DC-DC charger do I need for my battery?
A Ideally, your charger should provide around 10-20% of your battery's rated capacity (e.g. a 100Ah battery needs a 10-20A charger). This is true for lead-acid technology batteries but lithium batteries can often accept a much higher charge rate.
Q The VSR I am using is marked as 120A (or higher) will this damage my battery?
A No, as VSR's only provide what the alternator produces. This Amp rating is what the relay can handle and not what it will produce. 


Disclaimer - 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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Auto & Marine Electrical Components