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PV greater than 4 kw.

broadgage

How viable would be domestic PV systems of more than 4 kw ?

I appreciate that such systems require more complex approvals, but are not prohibited.

The proposed installation is a new large single floor home. A 100 amp 3 phase supply is to be requested. Options being considered are about 10 kw PER PHASE, plenty of roof area.

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    Once you are over 16A per phase, not only will the DNO have to provide settings, there may be a question over whether it can be connected at all. For a G99 installation in a residential area, you should ask the DNOs advice before you get too far. 

    Regards,

    Alan. 

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    Agree, but are they likely to give approval ?

    No nearby LV supply at present, I would expect a new transformer on or near the property as 11 kv Line passes by.

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    Surely if the proposed PV will provide that much, then why bother connecting with the DNO at all? Just go off-grid altogether.

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    For a single supply off an HV transformer, it is probably going to work. At the end of a long LV feeder, the voltage rise caused by the generation may not be acceptable. 

    Regards,

    Alan. 

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    whjohnson: 
     

    Surely if the proposed PV will provide that much, then why bother connecting with the DNO at all? Just go off-grid altogether.

    Because unless you add a very large battery, you'll only have electricity during the day.

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    Simon Barker: 
     

    whjohnson: 
     

    Surely if the proposed PV will provide that much, then why bother connecting with the DNO at all? Just go off-grid altogether.

    Because unless you add a very large battery, you'll only have electricity during the day.

    In that there's no feed-in-tariff for new installations these days, so you'd only get a minimal payment for export - that might not be an unreasonable way of making economic use of such a large PV investment.

    Otherwise, from a purely economic point of view, you might as well size the PV system to cover little more than the installation's baseload.

       - Andy. 

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    Going off grid was considered but rejected due to battery costs and replacements.

    Subject to DNO agreement, the plan is for about 10 kw of PV on each phase. A smaller PV array will charge a 24 volt battery for basic lighting and limited essential power in case of power cuts.

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