Inverter #1: Growatt MIN-11400-TL-XH-US (Version 2) with18.5kW PV installed on 4 strings. Batteries attached to Inverter #1: TWO 19.8 kWh ARO batteries in parallel. Total of 36kW-Hr of useable battery capacity attached to Inverter #1.
Inverter #2: Growatt MIN-11400-TL-XH-US (Version 2) currently with 14.1 kW of PV installed on 3 strings. Batteries attached to Inverter #2: TWO 19.8 kWh ARO batteries in parallel. Total of 36kW-Hr of useable battery capacity attached to Inverter #2.
Off-Grid output of each inverter is switchable (Breakers) to a 11 kW auto-transformer.
The system is wired such that the grid tie output of either inverter can be AC coupled to the off grid output of the other with the proper breaker/disconnect positions.
Typical operation: Inverter #1 in off-grid operation feeding the main panel thru the auto-transformer (Utility 200 amp feed breaker open) with Inverter #2 in grid tie mode AC coupled to it.
Inverter #2 grid tie output is feeding a sub panel which has a 100 amp feed from the main panel, the power meter for inverter #2 is between the 100 amp subpanel and the 200 amp main panel, typically set for zero export outside of daylight hours. The purpose of the power meter is to prevent charging Inverter #1 batteries from the Inverter #2 batteries.
Home is approximately 3,700 ft^2 of finished space with four 1-ton mini-splits for heating/cooling. There is two HVAC units (a 4 ton and a 3 ton) that are no longer needed since the mini-split installs.
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