Loadbank technical support

1- How to choose DC loadbank to test battery bank, DC power source

2- How to choose an loadbank AC to test the AC power of UPS, generators

3- Video about Vietpro loadbank AC/ DC

4- AC/ DC UPS battery bank diagram by nominal voltage at 110V, 220V, 420C, 520V

Shuld i choose Automatic Load bank or manual Load bank?