From everything I've read on here and the video, it appears there is no shock hazard unless you open the case with either battery or AC input live at the time.
I dont see why any boost converting would be getting done if the inverter was not on, so unless it was said somewhere and i missed it (highly plausible) i would think having no ac input or ac ouput is sufficient, without having to disconnect 'battery input'.
For me, I'm just going to turn everything off before I open the case, which is what I did anyway.
I agree with that. I feel like the biggest issue isn't actually that this shock hazard exists under certain conditions. I think the biggest issue is presenting something as a solution when it isn't (even unintentionally), or emphasizing the wrong parts of the solution.
So, for example, grounding your array framing doesn't fix this. We already had someone say in this thread that ground fault detection would still allow lethal current. At that point you might as well call the 'thud' of the person rolling off the roof hitting the ground, the 'ground fault detection' method for all the good it's doing in terms of shock hazard. "Did you hear that?"
Turning off all the 'switching power' going into or coming out of the inverter, is probably sufficient but should be verified by meter.
Slightly preferable in my opinion, is using this as a talking point to explain the importance of a 2-pole breaker on PV circuit, even though it is ostensibly a floating DC circuit for which breaking only one pole would normally be sufficient.
IMO you approach and explain it that way, you're doing the most good turning the 'prompt' into learning and into safety. As i said in another thread (poorly im sure), if you JUST tell someone ground your array and don't make them understand these other parts, you at best don't increase their safety, and at worst make their life more dangerous because now their nervous system has a better path back to source through the thing they are standing on, so that this theoretical PV ground fault detection can trip in the shortest number of seconds
after they're dead?! Hoo-fucking-ray. "Hey the 10amp fuse here just popped, i think we have a PV fault. Where's dad, we gotta tell him?" Dad actually popped first.
But with just the 2-pole breaker there is still the chance of working on the inverter side of that breaker circuit with AC on, not realizing it might be there. So it needs to be all 3 things: remove AC input (breaker) and output (power switch) at inverter, isolate PV from inverter with 2-pole breaker, and verify success with a meter. Then you are left with just the 'regular' DC hazards of the PV array.
Just my .02.
That said my cover is currently off since I am still working out COMs issues so it is easier to do. If you had an external circuit using this terminal though you could throw a switch and resistor in the mix to do this as well I would imagine.
