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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 regs for caravans and mobile transportable units say to earth/bond exposed conductive parts via the MET however I don't have a 240V system and therefore no MET. Providing an earth electrode seemed the best answer.



    Think about a commercially available motorhome , how the wiring is configured and  how  the van can be used.


    A fair bit of the time will be "off grid", that is, with no 230 volt A/C hook up.  You still will have a 12 volt system and no need for an earth rod. This seems to be identical to the proposed use of the van conversion in the OP.........12 volt system and no mains connection .

    A solar panel system [with a charge regulator], with the panel on the roof should make no difference or present any problem. Everything is "earthed" through the vehicle chassis as is normal with a motor vehicle - "negative earth".

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  • 0

    The regs for caravans and mobile transportable units say to earth/bond exposed conductive parts via the MET however I don't have a 240V system and therefore no MET. Providing an earth electrode seemed the best answer.



    Think about a commercially available motorhome , how the wiring is configured and  how  the van can be used.


    A fair bit of the time will be "off grid", that is, with no 230 volt A/C hook up.  You still will have a 12 volt system and no need for an earth rod. This seems to be identical to the proposed use of the van conversion in the OP.........12 volt system and no mains connection .

    A solar panel system [with a charge regulator], with the panel on the roof should make no difference or present any problem. Everything is "earthed" through the vehicle chassis as is normal with a motor vehicle - "negative earth".

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