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 batteries
Home standby generators must have a battery purchased separately. Most standard car batteries purchased from your local auto parts store will be compatible.
Environment
This article applies to Generac home standby generators. For portable generators, see: Where Do I Get a Replacement Battery for My Portable Generator?
Where can I find which battery my generator needs?
For specific battery size information, check the generator's spec sheet or check the Battery Type Section of your generator's product overview on the Online Product Lookup tool. Note that many home standby generator models share the same battery specifications, but you should always consult the official user manual to verify the appropriate battery for your specific model.
Example of a battery information shown on a product page on Generac.com:
Battery compatibility chart
| Generator type | Group 26R 540 CCA | 35 AGM 650 CCA | AGM Powersport Battery Group BTX20L 310CCA | Group U1, 12 volts and 300 CCA minimum | Supports charging AGM batteries |
|---|
| Older models | ✓ | | | | |
| Guardian series | ✓ | ✓ (Must have Evolution controller) | | | See owners manual |
| Next Generation Air-Cooled Generator | | | ✓ (part A0002359535) | | ✓ |
| 7.5 kW PowerPact | | | | ✓ | |
| Liquid-cooled | *See spec sheets and owner manuals | *See spec sheets and owner manuals | *See spec sheets and owner manuals | *See spec sheets and owner manuals | *See spec sheets and owner manuals |
*Liquid-cooled generator options vary widely. Owners should always consult their spec sheets and owner manuals to confirm battery compatibility. See How Do I Find a Copy of My Home Standby Generator Owner's Manual, Spec Sheets, or Installation Manual? for more information.
Why doesn't this article provide battery part numbers for all generator models?
There are a variety of battery options and there is often no "one size fits all" option. When selecting a battery consider:
- Battery choice depends on factors like environment (temperature) and generator type.
- The most important factor is group and U designation, as this indicates where the terminals are and the battery dimensions. The battery must fit and orientate correctly within the unit.
Where can I purchase a battery?
Most home standby generators can be purchased from an auto parts store. A local authorized dealer can also assist in obtaining a replacement battery: Where Do I Get a Replacement Battery for My Generac Generator?
Batteries can also be purchased from Generac's OrderTree site. Parts specific to your generator can be found by entering your Generator's model number.
See also
