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Avoiding Inadvertent Islanding

Discuss Avoiding Inadvertent Islanding in the Solar PV Forum | Solar Panels Forum area at ElectriciansForums.net

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Noddy67

hi Guys,

Funny question but I've just installed - in my own property finally - Enecsys Micro inverters and want to put up another array on a traditional string inverters too.

But could I possibly get inadvertent islanding in a powercut? ie. the string inverters believe the enecys is the main supply and mimics that, and the micro-inverters see the string inverters as the mains and mimics.. neither shutting down?

As i write the questions I realised that if you had two string inverters going to a junction box or shared isolator the same problem could occur but obviously doesn't. How do inverters differenciate between the AC thats from the grid vs the AC that is mimicking the grid from another micro-generation source?

Does that make sense.

Secondly - is there any problem in having two seperate generation systems/meters in the same property as long as they stay under the 3.68/4kWp sizing?
 
I do not know for sure but I suspect that the inverters have a bias built in that forces the frequency in one direction and if they detect it changing because it is not being locked by the mains then they shut down. You will probably find an article on it if you google - eg how the Sunny Island works.
Regards
Bruce
 
Thanks BruceB. Good article on Wiki suggesting i) there are lots of ways they do it and ii) islanding migth be a myth created by the DNO's for their own reasons. cheers again.
 
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