We recently just had a solar system installed here in Toronto. It was supposed to be a 6 kW system: 12 panels @ 500 W each (TS-BGT54-G11), into a 6 kW inverter (SOLAREDGE SE6000HUS).
Two months in, I just noticed that the installer actually put in a 5 kW inverter (SolarEdge SE5000HUS).
The proposal invoices schematics and even their own schematic sticker on the inverter reference 6 kW and the SE 6000 H-US unit.
I've talked to the installer, and they are giving me the run around. Their excuse is that the 6 kW unit was discontinued, so they swapped out and then I shouldn't be concerned because the 5 kW unit can handle the load.
I'm hoping to get some insight here as to how much I should be concerned and how hard to press them on this. I think it'll limit my output somewhat, but it's hard to tell. It certainly limits my ability to add a couple of panels, which I was thinking of doing. I get they don't want to replace it, as it would be costly for them to have to come in and redo that installation.