Read the manual thoroughly and understand all of the instructions, cautions, and warnings before using this equipment. If any section of the manual is not understood, contact your nearest authorized dealer, or contact Generac Customer Service at 1-888-436-3722 (1-888-GENERAC), or www.generac.com with any questions or concerns.
Home standby generator battery charging
Battery charging is controlled by the Evolution control panel. The battery charger is powered from an external 120VAC load connection through the T1 fuse located in the transfer switch. The 120VAC source must be connected to the generator in order to operate the charger. If T1 is not connected, or the fuse is blown, the controller will display a “Charger Missing AC” warning. See the What Does It Mean When My Generator Displays an Error Code: Charger Missing AC, Code 2780? article for troubleshooting.
Environment
This article applies to Generac Guardian series home standby generators 10 - 26 kW.
Battery charging facts
- The battery charging system is automatic and is not adjustable.
- The battery charger begins a charge cycle when the battery voltage drops below 12.6VDC.
- The battery is charged at the appropriate voltage for an 18-hour charge cycle.
- If the engine cranks during the 18-hour charge cycle, then the 18-hour charge timer is restarted.
- The battery changes even when the generator is switched to OFF mode, as long as the T1 line is properly connected at the transfer switch
- At the end of a charge cycle, if the temperature is less than 40 ⁰F, the battery is continuously charged at 14.1VDC. If the temperature is above 40 ⁰F, the charger stops charging the battery after 18 hours.
- 12VDC batteries have a total of 6 cells that are each providing 2.1VDC.
- A 100% charged battery will have a reading of about 12.6VDC
- 50% - 12.3VDC
- 0% - 11.4VDC
- If the battery drops below 12.1VDC, the generator will display a "low battery" status.
Troubleshooting
See also
