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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
    Thank you. I did actually consider vehicle fuses, but then changed my mind when I heard "remote beauty spots" being mentioned, still, as long as they keep enough spares it doesn't really matter, just thought MCB's would be safer and easier to reset..


    As far as I know they have a hook up unit for campsites and all I have to do there is attach it by earth nut to the vehicle body. When they're on a site without a supply I thought the earth electrode would be the best bet. Unfortunately they have already bought the batteries so that's what I have to work with.


    Trig
Reply
  • 0
    Thank you. I did actually consider vehicle fuses, but then changed my mind when I heard "remote beauty spots" being mentioned, still, as long as they keep enough spares it doesn't really matter, just thought MCB's would be safer and easier to reset..


    As far as I know they have a hook up unit for campsites and all I have to do there is attach it by earth nut to the vehicle body. When they're on a site without a supply I thought the earth electrode would be the best bet. Unfortunately they have already bought the batteries so that's what I have to work with.


    Trig
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