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piggles73 Replacing the System and adding an extension are a little different, this is why you could be receiving conflicting information.
Now in terms of an extension, you can add panels, however we will need paperwork explaining the split. The installer can help with this. Now any panels that exceed your current agreed TIC/DNC will be considered as an extension and be non payable, you will still benefit from the energy they produce.
In terms of replacing the panels, you can again replace the panels, these will obviously be more efficient compared to originally installed solar, however again you not allowed to exceed your TIC/DNC with this, replacements as advised need to be like for like and again not exceed TIC/DNC
Ultimately Eon Next would act as the licensee in this regard and any change you make, the system being yours would need to be a decision you make without Eon Next advising what you should do etc, all we have done here is relay the guidance provided by Ofgem.
6.11 States the above and confirms that any additional panels will not be eligible for FIT Payments not impacting the original agreement in place.
I hope this makes sense feel free to pop me a message if I can clarify anything further for you. If you do go ahead with newer technology we will potentially ask you for evidence via photo of your reads for the next 4-8 read windows while the tolerance catches up in the new system etc.
Thanks