A negative grounded PV system is a solar electric system where the negative terminal of the PV solar power array is connected to the ground. This connection is made through conductive materials like a fuse, circuit breaker, resistance device, non-isolated grounded AC circuit, or an electronic means within an inverter or charge controller.
Bottom line: 1) never ground the positive or negative feeds from the solar panels. 2) ALWAYS tie the panels frame to each other AND to a strong earth ground. This ground should never be broken for any reason. 3) figure out if your scc/ inverter is handling all of the system grounding needs, this is not a trivial task in my brief experience.
Negative grounding in solar inverters improves the overall performance of the solar power system by reducing electrical noise and interference, ensuring the smooth functioning of the inverter and the solar system. Grounded Vs. Ungrounded PV Systems: Which to Choose and When?
Only use measuring devices with a DC input voltage range of 600 V or higher. In order to check the PV system for ground faults, perform the following actions in the prescribed order. The exact procedure is described in the following sections. Check the PV system for ground faults by measuring the voltage.
Do not touch any parts of the substructure or frame of the PV array. Do not connect PV strings with ground faults to the inverter. Ensure that no voltage is present and wait five minutes before touching any parts of the PV system or the product. Only use measuring devices with a DC input voltage range of 600 V or higher.
A functionally grounded PV system is a solar electric system that has an electrical ground reference to the ground for operational purposes but is not solidly grounded. Also See: How to Ground Solar Inverter What is a Negative Grounded PV System?