This was bad on my part, I had no battery hooked at the time, was panel straight to the DC-DC converter, I knew better. Also, my normal 24V inverters were in use, so I was using a small 300W 12V inverter behind the DC-DC, so that's how the 30V got pushed to it. Several bad decisions there.
My concern now is that I didn't realize those converters would fail in a manner to pass the higher voltage straight through. Trying to determine the best safety mechanism to put between DC-DC converter and the 12V distribution blocks to protect 12V DC electronics.
Attached pic is example of ONE of my off grid systems. This one runs a router and mifi to provide internet for blink cameras at an off-grid location.
My SBMS system is still running in test mode on another system, but will also have a DC-DC converter with the same type of router and other 12V.