You are right my wording was off, actually the issue I see is not that the Scc is small but that the inverter power is too big, I cannot think of a combination that uses both to max. capacity, the Scc most probably yes but in winter with an array of 60A×24V=1440Wx3sh=4320Wh I cannot see how you will put to use a 3k inverter,even in summer with 1440Wx9sh=12960Wh is hard for me to figure a "normal" usage. Having said that the price difference (Mpp Solar) between the 1k and the 3k inverters is 200eur, at the same idle consumption probably it makes sense to get the 3k.
By saying what I said, but in reverse, you've just fallen into the trap backwards. There is no implied parity between inverter power and array power.
Again, it's rare that an inverter is used at its maximum power for a substantial portion of any 24 hour period. Sure, there are special cases that may apply, but there is still no implicit parity between the power of an inverter and the power of an attached array. As an example, I have 10kW of inverter, but I currently only have a 3kW array.
on 2/13:
17.56kWh consumed/produced (731W continuous averaged)
Peak inverter power used: 3,215W
Peak PV output: 2,829W
There are 3 main rules in system sizing:
- Inverter is sized for your maximum continuous loads.
- Array is sized for your daily consumption + surplus charging and your solar conditions.
- Battery is sized for the duration between charges.
Note how none equate inverter power to array power. It is very possible that the above could yield inverter and PV power the same, but that's only if your daily use and solar conditions happen to work out the same.
You don't need 3000W of PV to run a 3000W inverter. That's what the batteries are for. If you exceed the PV, the inverter will just start drawing the batteries down by the current needed to supplement the PV. On that same day I mention above, this is what my battery voltage and current looked like:
The red areas are where my loads exceeded my PV, and the inverter was drawing from the battery to make up the difference. The green area is where I had gobs of PV surplus that charged the battery to full, so at the end of the day, I started the evening with full batteries. Nighttime usage is typically 100-200W average, so I had plenty to get through the night.