To get to the page you screen shot you go to http://<GatewayIP>/
After you log in you need to enter a new URL in your web browser: http://<GatewayIP>/api/system_status
It will output something like this (some web browsers are better at formatting the data):
{"command_source":"Configuration","battery_target_power":-262.25,"battery_target_reactive_power":0,"nominal_full_pack_energy":27279,"nominal_energy_remaining":25679,"max_power_energy_remaining":0,"max_power_energy_to_be_charged":0,"max_charge_power":10000,"max_discharge_power":10000,"max_apparent_power":10000,"instantaneous_max_discharge_power":24000,"instantaneous_max_charge_power":14000,"instantaneous_max_apparent_power":11430,"hardware_capability_charge_power":0,"hardware_capability_discharge_power":0,"grid_services_power":-0,"system_island_state":"SystemGridConnected","available_blocks":2,"available_charger_blocks":0,"battery_blocks":[{"Type":"","PackagePartNumber":"3012170-05-B","PackageSerialNumber":"","disabled_reasons":[],"pinv_state":"PINV_GridFollowing","pinv_grid_state":"Grid_Compliant","nominal_energy_remaining":12784,"nominal_full_pack_energy":13580,"p_out":-130,"q_out":0,"v_out":238.4,"f_out":60.019000000000005,"i_out":2.7,"energy_charged":4141850,"energy_discharged":3610580,"off_grid":false,"vf_mode":false,"wobble_detected":false,"charge_power_clamped":false,"backup_ready":true,"OpSeqState":"Active","version":"452c76cbd7a6f3"},{"Type":"","PackagePartNumber":"3012170-05-B","PackageSerialNumber":"","disabled_reasons":[],"pinv_state":"PINV_GridFollowing","pinv_grid_state":"Grid_Compliant","nominal_energy_remaining":12895,"nominal_full_pack_energy":13699,"p_out":-130,"q_out":20,"v_out":238.3,"f_out":60.019000000000005,"i_out":2.5,"energy_charged":4193480,"energy_discharged":3652190,"off_grid":false,"vf_mode":false,"wobble_detected":false,"charge_power_clamped":false,"backup_ready":true,"OpSeqState":"Active","version":"452c76cbd7a6f3"}],"ffr_power_availability_high":7482.000000000001,"ffr_power_availability_low":3200,"load_charge_constraint":0,"max_sustained_ramp_rate":2500000,"grid_faults":[],"can_reboot":"Yes","smart_inv_delta_p":0,"smart_inv_delta_q":0,"last_toggle_timestamp":"2023-08-18T05:57:44.223209-07:00","solar_real_power_limit":1.7976931348623157e+308,"score":10000,"blocks_controlled":2,"primary":true,"auxiliary_load":0,"all_enable_lines_high":true,"inverter_nominal_usable_power":11600,"expected_energy_remaining":0}