Hi Sunnypower, yes I had a look at some silicon cable I had. I used to use a lot of it for leads on electric motors when I was a working person.
I had a small length of 1.5 mm on hand but of course that was not big enough for the job.
The Solar cable well, I had it here, it is reasonably flexible, and there was plenty of room. I wanted a primary that would handle around 120 amps max. It does that fine.
The things that let PJ inverters down is usually lack of care when they build them.
Mine have died from things like, loose connections on high current sections. Such as where the cables join the main battery studs inside the inverter.
Loose screws can be deadly too, I have had a couple that came with screws rattling about in them.
Oh and they don't like being switched from charger mode/ grid mode to inverter mode fast too. They like that transition to be slow.
Oztules wrote quite a bit about them blowing up when he was using them as a minigrid.
The way you are using yours sounds like a fairly light load is on them most of the time so they should be fine.
The ones I had that blew up always took out the mosfets, some of their resistors and the drivers.
So far I am pretty happy with the 8010 boards, they are much simpler, are through hole components, they are however difficult to get information on. Circuit diagrams seem to be non existent ( except for the actual 8010 board) and the writing on the connectors is in Chinese but from what others say they seem to last well.
Cheers
Pete