Hi guys. So I bought a LV6548 and I am getting ready to install my new santan 250w used panels on the roof. I’m going to run 2 strings into the LV6548 both of witch will be hooked into a metal shutoff fused with 30 amps. Also I plan on grounding the metal shutoff to my grounding black outside. I was reading the manual and it is a bit confusing for my on if I should ground the solar panels or not.