Dillsue

As post above, OFGEM changed the rules in Dec 2021 and loads of places I've seen don't reflect theses changes. Someone sent me link recently to a Guardian reporter saying you can't change anything which isn't what the OFGEM guidance says!

You can chop and change a FIT system without loosing the payments for the original capacity. Google " guidance for FIT generators" and it's all explained in there. Here's the link https://www.ofgem.gov.uk/publications/feed-tariffs-guidance-fit-generators see section 3

Going down the second inverter route likely means another G99 application so a tad more involved. Are all the panels going to be facing the same direction as that has a big bearing on peak generation and hence what you can have on each of the existing MPPTs. How many new panels do you want to add?

Unless you're on the old FIT scheme, AFAIK all UK payment schemes are based on export rather than generation so maybe a physical meter is obsolete now?? I'm assuming France could be the same?? Generation stats should/might be available on the monitoring platform

Google translate says 3 " MICRO-ONDULEURS THALEOS TRANSFORMER 2 "are micro inverters. If the app shows the panels generating then youre up and running. Anything you generate will be used to power your house and if there's anything you don't use it'll likely go the grid to power your neighbours

Fair chance. Grey conduit from roof is AC from micro inverters to surge protection then to Q2. Connection to main consumer unit is via RCD and Q1??? 2 cables and earth in the cable glands. All switched on so maybe already running or needs MCB in main consumer unit switching on?? Could be something completely different but micro inverters would work with what's been shown so far.

Well its not that obvious. You're posting on a UK forum and over here we have a single connection for both import and export. There's no second connection required to connect solar PV to. Maybe it's different in France but I'd be surprised if it was. In the UK you need an export MPAN, but that's not a second connection

Haven't you already got a connection to the grid to power your house??

The current varies with sunlight levels hence the difference in rated current for STC and NOCT

Last few pages from fig 6 onwards show the varying voltage current. The voltage looks very low as the curves are for a single cell, not a full panel!

Easiest way to add the bigger panels is to wire them to a separate MPPT input on your existing inverter. Next easiest, but may not be ideal, is to get someone to calculate the output for the various panel combinations to see if they can be wired to your existing inverter, if no spare MPPT input. Next is to replace your inverter with one that has a spare MPPT input. Lastly add optimisers/micro inverters which allows you to mix and match panels freely

DNO says they're waiting for a G98??

The receptionist is wrong....G98 is a mandatory notification. As professional installers they should know that. If your expecting to get export payments then the installer should be MCS registered, know what they are doing and have included for DNO notification. For a professional outfit it should take no more than half an hour to knock up an SLD and submit the commissioning doc. Take it up with the principle of the business to put in place some staff training!

Depends if the battery output is regulated by the inverter and if theres PV hooked up to the inverter. If theres 6kw of PV hooked up to the inverter and the battery can separately output 5kw then total is 11kw potential export. Power station is your premises with one or more generators within the premises.

?? For our G99 there was an application form to complete, a single line diagram to compile and a G99 cert for the inverter to submit..... same as the online process above?? Yours may have been more complicated as you've got quite a complex system, but the standard G99 application is straight forward. If the online system looses data quite easily then the non online application sounds easier??

Have a read of the ENA G99 guidance. If it doesn't include a requirement for MCS then SP shouldn't be asking for it.

SPEN are the DNO for southern Scotland and the old MANWEB area covering some of the north west and north Wales. Google "DNO network map"

OK. Maybe let them know that their colleagues in the Prenton engineering office dont(didnt) ask for MCS, not even a mention of it!

Absolutely. The comment was clarifying that micro inverters can interface to a battery, same as any inverter can

I believe Enphase do a battery to integrate with their micro inverters

No requirement for MCS with SPEN MANWEB when we submitted our G99 a couple of years ago. Have you been discussing export payments with SP? It's the only reason I can see them directing you down the MCS route if you've told them you want to claim SEG??

Batteries?? They can't export to the grid so no ENA approval needed. Its the inverter that needs to be ENA compliant

Try CEF for your kit. They were selling longi 405s for £52 earlier this year yet cheapest panel on the green2go site seemed to be £70+

For clarity- don't rely on an inverter shutting down as a safe way to isolate any inverter/generator/battery, ever. There's loads of old/cheap and potentially non compliant inverters around any or all of which can go faulty. Lockable AC isolators are specified for a reason throughout the world of electrical power. Of course you can defeat a cheap lock with a hacksaw/bolt cutters/sidecutters, but thats a deliberate act. Putting a fuse carrier back in can be done inadvertently and may not be questioned by whoevers trying to get the supply back on. On the other hand taking a hacksaw to a lock on a locked red and yellow isolator would set alarm bells ringing for anyone with even the smallest degree of electrical competence. Anyone with basic understanding of electrical working can come up with a way of working giving a level of safety that suits them and their appetite for risk. Anyone taking guidance from others on an internet forum should use the installed isolators and lock/cable tie them off if there's anyone else around while you're working on isolated kit.

Yep way easier.......but that's not the way industry works as its not classed as a positive isolation! Nothing to stop anyone inadvertently putting a spare fuse from the van back in. With lockable isolators theres a positive action with a hacksaw required to remove a lock so negligble scope for accidents. Not applying locks was the chargehands call but almost certainly breaching company procedures!!