Solar on the shady side of the roof

[J.P.M.]

NW/SE is 12 deg, NE/SW is 20 deg.

Thank you once again.
The low tilts help explain the relatively small difference in outputs as f(orientation).

[Calsun]

Many installations have sections of panels that produce a different amount of power during the day and this is handled by a dual MPPT charge controller equipped inverter. This type of inverter is quite common today but was rare when I installed solar on my house in 2012. Many inverters have 4 MPPT charge controllers and can handle 4 different arrays with no problem and one still has a single inverter box.

I was focused on the panel arrays on my house and largely ignored the inverter specifications. When I replaced the Sunpower inverter (which failed under warranty but with Sunpower dragging their feet to replace it for the past 4 months), I did so with a Solis dual MPPT inverter that has provision for adding battery backup later with the batteries charged by the inverter, easy addition of Wifi for both internet and smartphone connectivity, and many other features not in my original inverter. I would strongly recommend giving full consideration to the inverter that the dealer is selling you.

When I interviewed 4 solar installation companies the one I chose was the one whose people were willing and able to work with me. The other 3 had hired salespeople who were clueless and selling solar as they might sell home siding.