Time to discuss a few of the topics which might be a little confusing for some.
Lets start with pass through current:
Lets use an 8 kw inverter as an example.
The max. "continuous" pass through current on an 8 kw inverter is 50 amps, what does this mean.
You first have to understand how an inverter works, it has a built in change switch inside the inverter.
When there is grid power the changeover switch is closed which allows the power to flow from the utility through the changeover switch and out the other side to the essential side of the inverter. If you measure the power input and output to the essential/output side of the inverter, it is exactly the same.
This is why it is so dangerous to do a permanent bond, its like connecting any part of your electrical installation neutral to earth ( not going to go into details about the regs, you should be familiar with the regs by now)
When the grid power is lost, then the changeover switch in the inverter switches over, which means that the power from the grid is isolated (islanding mode) at which point you need to do a neutral earth bond. Now you have lost the star point of your transformer, which is why in some cases you need an earth rod (not if you are connected to a TN-S earth system)
What I am going to start doing with our TN-S earthing systems, is to install an earth rod at the meter box, which will be connected to everything, including the 6 mm earth wire bonding my panels.
If lightning protection is required then lightning specialist will be required and they will need to do what they need to do with the earthing and spikes.
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