Domestic EESS installation topology

Question

I have an EESS based on a Victron Multiplus inverter. This has separate AC Input and Output connections so the entire house load is routed via the inverter. 
 This topology was not covered in either the text or diagrams of the 1st or 2nd editions of the Code of Practice (despite a representative from Victron being on the panel AFAIR). Has this omission now been rectified in the 3rd Edition? 
 Also, I have installed a changeover switch so I can bypass the inverter for maintenance or if it fails. I am thinking of replacing this with a contactor so if the inverter fails it changes over to grid supply automatically. Is this kind of arrangement compliant with the 3rd Edition?

Griff Thomas · Accepted Answer

Hi Chris and thanks for joining the discussion. 
 I can only speak generally here as I don't have the full technical information from you but in our experience it is unlikely that most inverters will be adequately rated for "wiring" through as you have set out above, without knowing your exact setup I cant comment much further but I seem to recall that the Multiplus range may max out at 50A. 
 This particular topology needs very careful consideration due to the necessity to keep everything aligned to the overarching requirements of BS7671 and ESQCR 2002 (reg 21) especially in relation to islanding and the necessity to "isolate" from the mains as well as providing a N-E bond / reference when in island mode. 
 In relation to replacing isolator changeover switch with a contactor you would need to use a contactor that was type tested to EN60947-4 and include the isolation symbol on it. 
 Hope that helps steer your interest and thank you for taking part in the EESS Chat ! 
 Griff Thomas MIET GTEC Training ( www.gtec.co.uk )

Domestic EESS installation topology

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