Expanding current PV system

S'

Looking for some pointers on what direction to go.

Is it possible to add a grid-tied inverter to an existing hybrid? Will they be totally independent of each other?

I currently have a 7.4kW array on two separate strings connected to a Solis 6kW Hybrid.

4,4kW facing East

3.0kW facing SW

I have room to add another 9 panels to the existing 13 panel 4.4kW array so I was thinking of expanding this to 22 panels and add a separate string inverter to take care of the 3.1kW SW array.

Would that be the best option or would it be simpler to replace the 6Kw Solis with a 3 MPPT inverter to take in my three strings?

Btw, I have a 20kW diy battery.

championc

Just pick up a cheap string inverter from someone replacing one with a hybrid

unkel

@S' - what 3 MPPT input inverter are you thinking of? Not many in the market with Irish certification, I can't think of any. And if there are, they'd probably be expensive

That said, replacing your existing inverter is a simple solution, a DIY job even to just replace it, but if you want to add another string inverter you need an electrician to hook it up in your consumer unit for you. And has reporting issues particularly if they are not the same make inverter. Could still be cheaper mind. As @championc said you could pick up a very cheap 3-4kW second hand string inverter