Yep, i learned the hard way. Next time i post here the question before i do action.
I hope that only the PCB where i found the 3.3V is damaged and i can get a replacement from Eltek.
X ray is a interesting field especially X ray spectroscopy.
I have googled but not found a seller for 100% fail open relay. I only found a web-page with this info.
"One disadvantage of solid state relays is their tendency to fail “shorted” on their outputs, while electromechanical relay contacts tend to fail “open.” In either case, it is possible for a relay to fail in the other mode, but these are the most common failures. Because a “fail-open” state is generally considered safer than a “fail-closed” state, electromechanical relays are still favored over their solid-state counterparts in many applications."
On another web-page i have found information that relays switch about 100k+ times @ rated current and than they tend to fail.
But the solid-state ones about 50m+ times. If they are cooled right.
So i will risk my battery's life with the solid-state relay. I still find overall it the better option.
I have no schematic but measured no connection between the GND from the 3.3V system and the main DC out.
Had a MW RSP 48V before and it had stopped automatically @ 41.5V but about 6% less eff..
It seems that a very high voltage did came from the CAN right to the 3.3V PCB. I had seen and heard sparks fly.
Is cutting edge tech worth it ? Yep, every cent.
Merlin has still some 50pcs left https://endless-sphere.com/forums/viewt ... ilit=eltek
Enough for every try and error experiment.