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Hull minefield


PMcC

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1 hour ago, Tony Brooks said:

Once you mix a shoreline, an inverter, and/or a generator it is a bit complicated because all inverters do not work in the same way and doing things one way may be fine for some but destroy others. That is why I suggested that you may need professional help.

It matters not a jot what the bank is made from if you connect a wire from your hull to a spike in the grass then you are providing half a circuit with the water forming the other half. Depending on a number of things this might cause hull corrosion so asw Brain says do not do it. However in certain situations the electricity company may demand such a spike is used but that is all to do with providing  an effective earth wire in the shore line cable. You do not need to concern yourself about this as long as any shoreline bollard is professionally installed.

An galvanic isolator should protect your boat but take note that they can fail in one of two ways, open circuit or short circuit. Both have potentially undesirable or even dangerous consequences so you need one with some form of indication on it or learn how to test it and do so on a regular basis.

As  long as your hull has no connection to the bank , be it a earthing spike as you describe or an unprotected shoreline earth then a boat close by with an unprotected shoreline earth or an electrical fault could rot your boat as the fault current flows via the water, your boat and the unprotected shoreline earth. If your boat is not in electrical contact with the bank/ground then damage is far less likely.

 

Thanks Tony for explaining.

I will change the galvanic isolator for one with a reading.

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1 hour ago, brassedoff said:

Thanks Tony for explaining.

I will change the galvanic isolator for one with a reading.

 

The ones with a few LEDs do work. We got one this year - a cheapo one - and we had a very slight glow on one of the LEDs signifying a DC leakage. I posted here and the consensus was probably a bad earth from the inverter. We got a sparky in and he sorted it. Yes the Combi box wasnt earthed properly. New earth wire from the combi and no glow from the LED. If you get an LED type one, look at it at night. Easier to see problems.

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20 minutes ago, Dr Bob said:

The ones with a few LEDs do work. We got one this year - a cheapo one - and we had a very slight glow on one of the LEDs signifying a DC leakage. I posted here and the consensus was probably a bad earth from the inverter. We got a sparky in and he sorted it. Yes the Combi box wasnt earthed properly. New earth wire from the combi and no glow from the LED. If you get an LED type one, look at it at night. Easier to see problems.

And that goes some way to my advising that it may pay to get professional help.

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