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FranklinWH•aGate

Analysis by Marcus & Team

FranklinWH aGate System Shutdown During Large Appliance Use

Troubleshoot FranklinWH aGate system shutdowns when large appliances start. Learn diagnostics, solutions, safety, and preventative maintenance.

Frequently Asked Questions

•What is the surge capacity of the FranklinWH aGate inverter?

Refer to the product datasheet for the specific surge capacity rating. It's typically expressed in VA or kVA for a short duration (e.g., 2 seconds).

•How do I check the battery state of health (SOH)?

Access the FranklinWH monitoring app or the inverter's service menu to view the SOH percentage. A lower SOH indicates reduced battery capacity.

•What is the recommended wiring size for connecting the inverter to the load panel?

The wiring size depends on the inverter's output current and the distance to the load panel. Consult the NEC tables and a qualified electrician to determine the appropriate wire gauge.

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Marcus leads the technical research department at Storage Faults. Together with a team of systems analysts, he specializes in translating complex solar storage error codes into actionable diagnostic steps for the US market.

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Technical Recommendation:

Access the inverter's service menu (refer to the manufacturer's documentation for the key combination). Check the DC bus voltage under load. A significant drop in DC bus voltage during appliance startup indicates a potential battery or inverter issue. Check the inverter error logs for specific fault codes related to overcurrent or undervoltage during the startup event.

Technical Overview:

The FranklinWH aGate is a hybrid inverter managing power flow between solar panels, battery storage, the grid, and connected loads. Large appliances draw significant inrush current upon startup. The inverter's internal overload protection can trigger a shutdown if the current demand exceeds the inverter's surge capacity or if the battery SOC is too low to supplement the grid. The system relies on accurate current sensing, voltage regulation, and a robust battery management system (BMS) to handle these load transients. AC coupling allows it to backfeed, and rapid shutdown (RSD) must function per NEC 2017/2020.

Recommended Action:

1

Verify appliance power requirements: Check the nameplate of the large appliance to determine its startup current draw. Compare this to the inverter's surge capacity specification.
2

Check Battery SOC: Use the FranklinWH monitoring app to confirm the battery SOC is within the recommended operating range (typically above 20%).
3

Inspect wiring: Use a multimeter to verify the voltage at the inverter's AC output terminals under load. Confirm that the wiring size meets NEC requirements for the load current. Replace undersized wiring with appropriately sized conductors.
4

Monitor grid voltage and frequency: Use a power quality analyzer to monitor the grid voltage and frequency during appliance startup. Address any grid instability issues with the utility company.
5

Test inverter surge capacity: Use a calibrated load bank to test the inverter's ability to handle surge currents. Replace the inverter if it fails to meet its specifications.
6

Check BMS parameters: A qualified technician must access the inverter's service menu (using the manufacturer's instructions) to verify the BMS calibration and error logs. Recalibrate the BMS if necessary. Replace the battery if SOH is low or if the battery is outside of the warranty conditions. The battery needs to be load tested by a licensed technician.
7

Review event logs: Consult the inverter's event logs for any error codes related to overcurrent, undervoltage, or grid instability. Contact FranklinWH technical support for assistance with interpreting the logs.

What to Look For:

The FranklinWH aGate hybrid inverter shuts down completely when a large appliance (e.g., air conditioner, electric water heater, refrigerator) starts. This results in a loss of power to the connected loads. The system may or may not automatically restart after a period of time.

Common Causes:

Inverter overload: The startup current of the appliance exceeds the inverter's surge capacity, leading to an overcurrent fault.
Low battery state of charge (SOC): The battery cannot supply enough power to supplement the grid during the appliance startup, causing voltage sag and inverter shutdown.
Inadequate wiring: Undersized wiring between the inverter and the load panel can cause excessive voltage drop, triggering a fault.
Weak grid connection: Fluctuations in the grid voltage or frequency can interact with the inverter's anti-islanding protection, causing a shutdown.
Faulty current sensor: An inaccurate current sensor in the inverter may misreport the load current, leading to premature shutdown.
BMS malfunction: The battery management system may be misreporting the available capacity or failing to provide sufficient current.

Preventative Care:

Regularly update the inverter firmware to ensure optimal performance and bug fixes.
Perform periodic battery capacity testing to monitor the battery's state of health (SOH).
Monitor the inverter's operating temperature and ensure adequate ventilation to prevent overheating.
Inspect all wiring connections for corrosion or loose terminals.
Avoid overloading the inverter by staggering the startup of large appliances or using load shedding devices.