We've just wrapped up a new install of a 7kW system with 2x powerwalls, and shortly after the install we were finding weird behavior like lights randomly dimming (it looked like what you would imagine an unstable power supply might yield). I contacted Tesla and a couple of (awesome) technicians came out. After spending quite a long time they discovered that the main power input wasn't secured correctly (literally, the big fat cables coming from the main power grid weren't screwed in securely.. eek) and their theory was it was shorting.
After they left things seemed fine, but we intermittently still have flickering lights, though not as bad as previously. We had also recently replaced most incandescent bulbs with (dimmable) LEDs, but that was prior to the solar install and we didn't have any issues before the solar install.
What's the view here? Is there something "wrong", or is this just a side effect of having solar+powerwalls+grid and software switching between them or mediating power flow? Anyone else seen this?
I'm worried that tracking down the issue might be so difficult as to be nearly impossible.