Triassic

Can you have too much PV

Recommended Posts

56 minutes ago, Nickfromwales said:

and the FiT is deemed from installation,

 

FiT isn't deemed. You always have to have a total generation meter and the FiT payments are made based on readings from that.

 

What is often deemed is exports. You can have an export meter and get paid for the actual exports made or you can have “deemed” exports where the assumption is made that you export 50% of the metered generation.

  • Thanks 1

Share this post


Link to post
Share on other sites
29 minutes ago, newhome said:

 

 

 

If they think you are generating too much you get a letter saying they want to visit ... 

 

Really ..??! I get it if you go a ‘lot’ over but an optimiser can put 10-15% increase on. Or is this based on deemed production ..?? So if you start selling back more than the 4kw..?

Share this post


Link to post
Share on other sites
3 minutes ago, PeterW said:

 

Really ..??! I get it if you go a ‘lot’ over but an optimiser can put 10-15% increase on. Or is this based on deemed production ..?? So if you start selling back more than the 4kw..?

 

The majority of the FIT payment is made based on generation for which a meter is installed. Export is deemed to be 50% of generation (on the original FIT scheme anyway). If they visit and you’ve only optimised then fine (assuming the rules allow for this) but if they visit and you’ve stuck more panels up then you are screwed. 

Share this post


Link to post
Share on other sites
2 hours ago, readiescards said:

Though it seems moving panels is not allowed under the MCS scheme.

 

That's interesting.

 

My MCS installer seemed to think it could be done.

 

We even designed the strings etc and discussed the capacity of the Inverters, and the layout of future wiring, to facilitate it.

 

I am all Solaredge, but do not yet have a veranda on the south side. Any move of panels for me would be large, potentially involving 12 or 16 panels.

 

F

 

Edited by Ferdinand

Share this post


Link to post
Share on other sites

I'm sure it can be done, but to stay 'legal' you should inform them of any change in the system. E.g. if your inverter fails you should tell them that it has been changed, even if it's exactly the same model.

 

So I'm sure you can fit optimisers but you should inform the system of the change. If you don't and they discover it they have the power to cancel your contract.

Share this post


Link to post
Share on other sites

At our last house, we initially installed a G83 sized system but subsequently added another the same size so moved onto G59 requirements, the main change being a larger inverter with the relevant safety protocols.  Both were MCS installs, so we received FIT payments, the original array at the rate applicable when installed, the additional array at the lower rate applicable for larger installs.  Export payments were deemed at 50% of total generation of the two arrays.  The first array had been SW orientated, so the second was fitted on a SE roof.  What I had hoped was that I would benefit from a much earlier start to useful generation with the SE facing panels.  The reality was somewhat different.  Whilst we did start generating a little earlier, the amount generated wasn't massive.  Roughly speaking we used 40% of what we generated with one array (we had a heat pump) but the % of electricity generated that we used actually reduced with two arrays fitted, albeit our import reduced, but I do think it is a case of diminishing returns.   

 

What we did end up with was a massive peak of generation in the summer daytime, some days being 55kWh plus.  We couldn't use that amount of electricity, even with diversion to DHW.  Having loads that can absorb all the excess is key.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now