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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
    Touching the terminals whilst changing 12 volt fuses is fine.

    Batteries should be kept away from sources of sparks, but are otherwise fairly low risk. I would not place anything that can spark in a battery compartment. The battery isolator and the main switch should be close to the battery, but NOT in the battery box or compartment.


    I would normally fit a main fuse of from 30 amps to 60 amps near the battery, and run heavy cable from the main fuse to an automotive fuse box, with fuses of from one amp up to 15 amps according to circumstances. Relatively close fuse protection is prudent for small 12 volt motors, but less important for other loads like lighting.

    I would normally wire 12 volt lighting and small power circuits in 2.5mm cable from a 10 amp fuse.
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  • 0
    Touching the terminals whilst changing 12 volt fuses is fine.

    Batteries should be kept away from sources of sparks, but are otherwise fairly low risk. I would not place anything that can spark in a battery compartment. The battery isolator and the main switch should be close to the battery, but NOT in the battery box or compartment.


    I would normally fit a main fuse of from 30 amps to 60 amps near the battery, and run heavy cable from the main fuse to an automotive fuse box, with fuses of from one amp up to 15 amps according to circumstances. Relatively close fuse protection is prudent for small 12 volt motors, but less important for other loads like lighting.

    I would normally wire 12 volt lighting and small power circuits in 2.5mm cable from a 10 amp fuse.
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