Newbie Question - Cap on back to grid?

The only cap I know of is the tax free up €200 for domestic installs with up to a 6kw inverter after that you should declare it as income.

I don't know what your neighbour is on about, so I wouldn't buy a battery unless you do the maths to see if you need one. Personally I think batteries are a benefit for various reasons but it's a case by case basis. Members here have received more than €250 from suppliers. I think your neighbour might not know the full facts. Post #2205 here is an example https://www.boards.ie/discussion/2058094040/pv-feed-in-tariff/p74

Are you looking to get solar yourself?

Ignore the TAM grant - only for farms / certain large scale solar setups. Your neighbour has 8 panels, so won't be TAM. If you're asking for you as you're getting solar, as @con747 says 'The only cap I know of is the tax free up €200 for domestic installs after that you should declare it as income.'

Until about 6 months go you didn't get paid for unused excess. But you do now, called FIT (feed in tariff) - it's a credit on your electricity bill. So that might be what the neighbour refers too as they got setup at a time without those payments.

Class, you'll have a good setup so. Pure South produces a wild amount. I've E/W split and my output is much lower than South. But still delighted to have it and best we can do with the roof we have.

I've no battery either now. Zappi and Eddi are your battery in a sense as can send excess into car and hot water tank. I'd suggest hold off on the battery for at least a few months and see how it all behaves. Others will have a different view I'm sure. If EV is in the driveway when it's daylight, it will hoover up the excess. You can decide the priority on Zappi or Eddi in terms of which gets the excess 1st.

And the max is actually less than 6kW. ESBN allows 25A which works out at less than 6kW at 230V. But most people have been installing 6kW inverters but after May they will no longer accept 6kW inverters (28A). see here Micro-Generators (esbnetworks.ie)

They mean in a couple of months the rules change so you will only be able to install a 5kw inverter on an NC6 form so to go higher you will need to get the NC7 form which costs just under €1000.

I was seeing 8kWp peaks today, midday, 8.2kWp array with a 6kW solis hybrid inverter. 6kW to the house and 2kW to the battery. Still exporting zero.

a - 6kW inverters can pull up to and above 8kW depending on voltage. I saw 8.07kW today from my 8.2kWp arrays on a 6kW inverter

b- yes only new customers

Saw this today as well when sun was at its optimal orientation this afternoon. I have a 5kWh inverter paired up with a 5.6kWh array and was generating just over 5.8kW PV side (DC ) and 5.55kW AC side. Do cool temperatures help in terms of reducing voltage?

Probably a silly question but - Regarding the change of 6kWh inverters not being allowed after may , I've recently got one of these and am running a 22x400 panels with it, if my inverter goes kaput in a year or two can I replace it with the same inverter or do I have to downgrade to the 5kWh one, which then in turn would probably raise issues with the amount/VOC of the panels I currently have driving it ?

There should be no change with a like-for-like warranty replacement, that's only my view. Don't sweat about it, you might donkeys years from the inverter. I've only heard of 1 or 2 dying on this forum in the year I've been here - so failure rate is low.

If you have a 1.6 litre car and engine dies and is replaced with a 1.6 litre engine, it's still a 1.6 litre engine. It's not a 1.4 or 2L one - get what I mean?