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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
    Couldn't agree more about not being able to earth on the go etc. also let me assure you, there's no way anything I am looking at installing (with the possible exception of the extractor fan, which I haven't seen yet) will be able to give anyone a shock because it is in conduit and insulated with wood rubber and plastic at every point except from the obvious battery compartment which has an isolator switch. The electrode is intended to protect from failure in the PV panel on the roof. I have instructions to ground the frame. It's also probably the best I can do in the instance of any failure in the double insulation which the fuses will sort out anyway.


    I've taken on board all the stuff about the fuses (too used to ac systems obviously) and everything you're saying. I suppose it's not really the electrics I have a problem with now. Think you've given me a good heads up on it to be honest.


    It's the whole thing - gas, solar power, battery vapours, water, electrics and fire all in a relatively cramped space and being run by people who will absolutely park up under this most wonderful tree they found in the middle of nowhere despite knowing a thunderstorm is on the way, or changing fuses without isolating while touching the contacts with their bare hands,..  probably not great examples but making this easy for them to use is a real concern. I'm just going to have to put instructions on everything. Lol I'll end up spending more time on the instruction manual than the wiring.


    Thanks everyone.


    T
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  • 0
    Couldn't agree more about not being able to earth on the go etc. also let me assure you, there's no way anything I am looking at installing (with the possible exception of the extractor fan, which I haven't seen yet) will be able to give anyone a shock because it is in conduit and insulated with wood rubber and plastic at every point except from the obvious battery compartment which has an isolator switch. The electrode is intended to protect from failure in the PV panel on the roof. I have instructions to ground the frame. It's also probably the best I can do in the instance of any failure in the double insulation which the fuses will sort out anyway.


    I've taken on board all the stuff about the fuses (too used to ac systems obviously) and everything you're saying. I suppose it's not really the electrics I have a problem with now. Think you've given me a good heads up on it to be honest.


    It's the whole thing - gas, solar power, battery vapours, water, electrics and fire all in a relatively cramped space and being run by people who will absolutely park up under this most wonderful tree they found in the middle of nowhere despite knowing a thunderstorm is on the way, or changing fuses without isolating while touching the contacts with their bare hands,..  probably not great examples but making this easy for them to use is a real concern. I'm just going to have to put instructions on everything. Lol I'll end up spending more time on the instruction manual than the wiring.


    Thanks everyone.


    T
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