I’m planning a ground-mounted solar build at my rural property and could use some advice on the layout and equipment configuration.

Because of site layout and space, all the main equipment (ground mount array, hybrid inverter, future battery bank, and generator) will be located at an outbuilding about 300 feet away from the main house.

Property & Infrastructure Details:

• Main House: Location of the utility meter and main service panel. The basement has no room for inverters or battery banks.
• Outbuilding & Feeder: Located 300 feet from the house, connected via an existing 100A underground feeder. Running new cable or trenching between the house and outbuilding is not an option.
• 12kW Generator: Located at the outbuilding. It currently runs through an older manual disconnect setup to backfeed and power the entire property during blackouts. Voltage drop over the 300ft feeder has never been an issue under full load.

The Build Plan:

• Phase 1: Ground-mount solar array with a hybrid inverter at the outbuilding. Grid-tied to offset house energy use by backfeeding through the existing 100A feeder line. No batteries initially.
• Phase 2: Add a battery bank at the outbuilding for blackout backup.
• Generator Integration: Integrate the existing 12kW generator directly into the hybrid system so it can charge the batteries and supplement solar during extended power outages.

Questions:

1. Islanding & Grid Isolation: When the power goes out, I need to isolate the house from the grid so the inverter can island the outbuilding and feed backup power to the house over the 300ft line. If the hybrid inverter and batteries sit at the outbuilding, what is the best way to handle grid isolation at the house service entrance?
2. CT Sensors / Energy Monitoring Across 300 Feet: Most hybrid inverters use CT sensors at the main service panel to monitor grid power flow and manage zero-export or battery usage. Without laying new wires, what options exist for sending CT data or Modbus communications 300 feet back to the outbuilding (e.g., wireless bridges, Modbus over powerline, etc.)?
3. Hybrid Inverter & Generator Setup: For those running hybrid inverters (like a Sol-Ark, EG4, or similar) with a dedicated generator port, how well does the inverter handle blending solar, battery, and a 12kW generator when feeding a remote main panel over a long subpanel line?

Appreciate any recommendations, potential pitfalls, or equipment suggestions from folks with similar setups!