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Excess Solar generation - not grid connected (G-59)

Aneysha Minocha
Hi All,


We are working with commercial premises that installed Solar PV in the days of the Feed-in-Tarriff. These sites have excess solar generation being measured through a channel, but there is no export from site (not G-59 connected) and the customer is on a deemed Feed-in-Tariff. From the data, there seems to be a high proportion of "excess" / "export" energy from sites.


Question - if the sites are not consuming the excess energy and thet are not set up for grid export - where is this excess energy going?


Would appreciate your valuable input please.

Thank you!
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    If the PV system is grid-tied, then it's normal to export any excess electricity.  But if export is forbidden because the local substation couldn't cope with export, then the only option would be to reduce the output of the inverter.  If this happened, the excess electricity would be lost within the panels.  Any electrons generated within the panels, and not pulled out by the inverter, would re-combine into the silicon without going anywhere.


    It's common for micro-generation schemes to have no export meter.  My little system of solar panels on the roof has a generation meter for FIT purposes, but nobody is measuring what I export.  That doesn't stop it exporting any electricity I'm not using.  I am given a "deemed" payment on the assumption that I export about 50% of what I generate.
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  • 0
    If the PV system is grid-tied, then it's normal to export any excess electricity.  But if export is forbidden because the local substation couldn't cope with export, then the only option would be to reduce the output of the inverter.  If this happened, the excess electricity would be lost within the panels.  Any electrons generated within the panels, and not pulled out by the inverter, would re-combine into the silicon without going anywhere.


    It's common for micro-generation schemes to have no export meter.  My little system of solar panels on the roof has a generation meter for FIT purposes, but nobody is measuring what I export.  That doesn't stop it exporting any electricity I'm not using.  I am given a "deemed" payment on the assumption that I export about 50% of what I generate.
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