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Expanding Existing Solar System and adding battery and keeping fits payments
edited 27 June 2022 at 4:37PM in Green & ethical MoneySaving
15 replies 408 views
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2KW - 2.8KW on the back and inverter
AC coupled battery storage that can handle excess from the old and the new system (size to be determined but at least 6KW.
generation meter for second system and export meter for second system if possible.
so yesterday during the day the solar panels performing badly but enough for my day to day use excluding cooking, kettle, shower. but these would be excluded to a lesser degree on a good day,
Today they are all over the place 300W to as high as 1.7kW as the sun goes in and out of hiding behind the clouds. (watching the inverter feed it updates every 5 minutes so it is snap shot accurate rather fully reflective.
(shame I cant clear the clouds directly over the panels, the output on cloudy days would be massively different if i could clear the clouds.)
My understanding is the AC coupled can effectively be positioned anywhere subject to cable suitability and the brick out building would make sense I suspect rather than in the house, thinking of available space.
still waiting for clarifications, so much data out there hard to know what is genuine and what isnt
some of the other quotes have been dubious and not exactly what was being asked for......the joy
I won't suggest anyone struggle through my post above, where I myself tried to struggle through the confusing info out their regarding adding capacity to an existing FiT PV system.
But I did try to stress, that whilst it does seem OK, and the expanded system will then 'simply' be subject to apportioning, I went on and on ..... and on, about how unclear the info from OFGEM was.
Well, it seems someone agrees with me, OFGEM!
So here's the full document, it's not exactly clear, in terms of easy reading, but does stress several times that a FiT approved system can be extended, with the FiT provider then apportioning generation. But note, it states and stresses that the FiT provider must be notified, which is totally fair, and I'm not just being a goody two shoes, I think an increase in generation will be thrown up by the computers, and then you'd possibly risk losing all future FiT income (I assume) for mucking about / fraud(?)
If anyone does have doubts, please read appendix 2 & 3, as suggested, which helps to clarify, and gives examples of how it all works. And if Appendix 2 seems tricky to understand, appendix 3 is, I believe, clearer.
Feed-in Tariffs (FIT) scheme: Decision on replacement generating equipment
6.4. An extension or reduction is a modification to an accredited installation to increase or decrease its total installed capacity (TIC) from the same type of eligible technology (eg solar PV or wind).
6.5. This may happen by:
• adding or removing generating equipment
• replacing generating equipment with a larger or smaller TIC
6.6. You must notify your FIT licensee if you extend or reduce the TIC of the accredited installation. If it was accredited under ROO-FIT, you must also inform Ofgem. For information on the difference between the two, see paragraph 2.4.
6.7. If an extension does not have a separate generation or export meter, readings must be prorated according to TIC, to ensure you are paid correctly. For example, if a 40kW installation has been extended by 10kW:
• and the extension is accredited, the generator is entitled to payment for 80% of the electricity at the tariff rate(s) of the original installation and 20% at the tariff rate(s)6 of the extension
• and the extension is not accredited, the generator is only entitled to payment for 80% of the electricity they generate and export
6.8. Meter readings should be taken on the date of the extension or reduction.
6.7 refers to accredited or not accredited, the docs go on to explain that this means the extension was eligible for FiT's when carried out, but at a lower rate. Or added after the end of FiT's (15th January 2016).
I appreciate this is a lot of word salad, but hopefully we can now all relax a bit about replacing damaged panels with newer, but more powerful ones, and all other scenario's, without the spectre of FiT withdrawal hanging over us.
For general PV advice please see the PV FAQ thread on the Green & Ethical Board.