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Topic Title: Earthing system for stand alone PV system
Topic Summary: Is there a scheme of earthing is reccomended for a stand alone pv system?
Created On: 22 November 2013 06:41 PM
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 22 November 2013 06:41 PM
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Posts: 11
Joined: 12 November 2013

I recently joined a company which is specialised in PV system solutions and i have to handle a site which was previously handled by the previous engineer here. Since i was previously in the electrical distribution design and mostly building services, i am still on my leaning curve here.

This involves a PV system which is stand alone c/w battery banks and upon insufficient solar power for the load, it switches to the local utility grid supply . This is nothing fancy. However, concerning the earthing scheme, my local utility uses T-T system. so i was hoping that my PV system is also a T-T scheme. However, after investigation, i found that the AC part of the PV system is a TN-s scheme, that is the PE is linked to the neutral at the source (inverter neutral) and then grounded...

Since the company is starting to formalise things now, there are basically no record of what the previous engineer did..but technicians there are telling me that it is the manufacturers recommendation to go for the TN-s scheme...

Has anyone done any simmilar installation and can give me an insight on the earthing requirement of the PV system. ..because i had an argument as to why we dont do a T-T system for the PV part, just like we do for a standby generator which is backup for a TT scheme distribution in a a building. He is sticking nearly blindly to the TN-S system....Someone please help me out!!

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