Solar PV savings estimation, have I gone wrong?

unkel

You won't be self using anywhere near 100% of your production, not even with twice the size of battery you are planning, EVs at home and immersion diversion and a lot of self discipline. Couple of good days in a row, your cars will be full, your water hot, battery full and you will feed over 5kW directly to the grid for the whole day. Also your production estimate is way too high. If you had a 7.2kW inverter, you would make your 7MWh per year if the array is pure south facing in one of the better parts of Ireland for PV (like Dublin area, or the south east). But you are not getting a 7.2kW inverter presumably just a 6kW one. Also why buy Victron? They are overpriced for what they are and do not have Irish certification afaik

As @KCross said, do the sums again and also without battery. With the generous FIT recently proposed, your pay back period is going to be shorter without one, unless you buy very well and DIY. Also with feeding in, by definition you will financially use every single kWh of your production

slave1

https://www.boards.ie/discussion/comment/119568622#Comment_119568622

That’s exactly what I have, the ME is an inverter too. On a clear sunny day 15kW is possible, 2x6kW from PV inverters and 3kW from battery inverter. Enjoy an electric shower and plenty of headroom to charge an EV, work the oven etc