The HP-AHP20SA series is equipped with a robust system to handle utility input irregularities, safeguarding against voltage-related issues:

AC Over Voltage Protection (Err8): When the utility voltage exceeds the normal range, indicated by the red GRID indicator and intermittent beeps, the system stops charging and supplying the load.

AC Under Voltage Protection (Err25): If the utility voltage falls below the acceptable threshold, the system similarly ceases charging and power supply, with the red GRID indicator signaling the issue.

Additional Protections:

• AC Over Current Protection (Err9): Triggers if the load power exceeds the inverter/charger's capacity.
• AC Pre-Charge Timeout (Err28): Ensures safe pre-charging of the system.
• AC Relay Adhesion (Err29): Deals with relay issues.
• AC Frequency Error (Err31): Addresses frequency discrepancies.