Hello!
We usually bond the negative of the lynx to the main earth terminal.
My first question is how I should think about wire gauge for the grounding cable from the lynx. It seems unreasonable to make it as thick as the DC cables from batteries/inverters. What is the best practice on this? As of now I’ve used the inverter power to give a sense of what’s enough, usually with some precautions, like 15kVA ~16mm2. My reasoning being that it’s thick enough to take a full fault current and last longer than the fuses.
Second question; when is it advised to not ground the lynx (or DC negative overall)?
Is the main point of it to avoid AC currents on the DC side if there’s a major problem with the inverter? Or is it to trip a fuse if there’s a damaged DC cable connected to “ground”?
Thank you!