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DC LV Battery Power Supply for Motorhome

TrigPoint
Hi everyone!


I've been asked to install some wiring in a van conversion and I need a bit of advice. The plan is a 110Ah 12V leisure battery, a SELV system and TT earthing (earth electrode from the body of the van.) 


I'm trying to work out the PSCC and PFC so I can choose the overcurrent and fault protection.


So,


a) Is measuring the impedance of the battery and using Uo Cmax / Zs 2R1 (with the measured battery impedance as Zs) acceptable to calculate PSCC


and,


b) Is Uo/Ze (with measured the battery impedance as Ze) acceptable to calculate PFC?


Many thanks in advance for your answers.


Trig


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  • 0
    The SELV part does not  need an electrode at all. However the words 'hook-up' on a caravcan site usually mean a rather ratty 230V lead trailed in the mud joining the vehicle at a CEE  (commando) inlet.  That will need a bit more thought, even if all it supplies is one socket for the battery chargers. In a larger van, it is likely to develop mains leads for the fridge,  extra lights, telly etc.

    Earth rods and mobile vehicles tend to get left off, whatever the instructions  say, as it works without it. so an RCD is required, and I'd add some sort of L-N reversal detector, if only a plug in socket tester.
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  • 0
    The SELV part does not  need an electrode at all. However the words 'hook-up' on a caravcan site usually mean a rather ratty 230V lead trailed in the mud joining the vehicle at a CEE  (commando) inlet.  That will need a bit more thought, even if all it supplies is one socket for the battery chargers. In a larger van, it is likely to develop mains leads for the fridge,  extra lights, telly etc.

    Earth rods and mobile vehicles tend to get left off, whatever the instructions  say, as it works without it. so an RCD is required, and I'd add some sort of L-N reversal detector, if only a plug in socket tester.
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