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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
    I had a look in a recently fitted out Housing Association maintenance team van with an inverter that supplies a double socket in the cargo area. Just inside the side door is a coiled main earth conductor and standard earth rod all tied up with cable ties, having never been used.


    I passed comment to the electrician who drives the van that he had not used the rod, he said he had been told he could only use the inverter when the engine is running, so had only used it to charge cordless tool batteries when traveling between jobs and you cannot use an earth rod when you are doing 50 miles per hour on a dual carriageway.


    Being selective about what gets plugged in and keeping that equipment and the inverter well maintained is the way to maintain safety.


    Double insulation is a key protective measure, avoid equipment that needs earthing for safety.


    Andy Betteridge
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  • 0
    I had a look in a recently fitted out Housing Association maintenance team van with an inverter that supplies a double socket in the cargo area. Just inside the side door is a coiled main earth conductor and standard earth rod all tied up with cable ties, having never been used.


    I passed comment to the electrician who drives the van that he had not used the rod, he said he had been told he could only use the inverter when the engine is running, so had only used it to charge cordless tool batteries when traveling between jobs and you cannot use an earth rod when you are doing 50 miles per hour on a dual carriageway.


    Being selective about what gets plugged in and keeping that equipment and the inverter well maintained is the way to maintain safety.


    Double insulation is a key protective measure, avoid equipment that needs earthing for safety.


    Andy Betteridge
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