When selecting a generator for the HP-AHP20SA series, it's important to ensure that the generator's capacity matches or exceeds the power demands of the inverter/charger. Consider the following guidelines:

Generator Capacity: Choose a generator with enough capacity to handle the peak and continuous power requirements of the HP-AHP20SA series. A larger generator than the minimum requirement is often preferable to provide a buffer against overload, especially under heavy loads or when charging batteries.

Settings Adjustment: If the generator is smaller than the ideal size for your inverter/charger, adjust the settings on the HP-AHP20SA series to reduce the AC input current limit and/or the DC charge current limit. This helps prevent overloading the generator.

Duty Cycle: Pay attention to the generator's duty cycle rating. Some generators might be advertised with peak output capabilities but are only designed to sustain a fraction of that output for extended periods.

Compatibility: Ensure that the generator's output frequency and voltage match the requirements of the HP-AHP20SA series. Do not mix and match frequencies and voltages from different regions.