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Generac standby genset is showing an "Inspect Battery"

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Generac standby genset is...

Generac standby genset is showing an "Inspect Battery" message. Generator did not start yesterday on its weekly test cycle, but it started manually this morning fine. Battery voltage is 13.5 volts. Battery is 5 years old. I'm guessing it's time for a new battery?

Mechanic's Assistant: Do you know the model of your Generac generator?

17KW Model 5504

Mechanic's Assistant: How long has this been going on with your Generac generator? What have you tried so far?

First sign of a problem was when it didn't start for its weekly test cycle yesterday. Checked the battery voltage this morning, cleaned and retightened the terminals.

Mechanic's Assistant: Anything else we should know to help you best?

No, that's it.

Submitted: 2 years ago.Category: Small Engine
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Answered in 5 hours by:
7/14/2020
Technician: Hank F., Technician replied 2 years ago
Hank F.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 18,123
Experience: Certified on Onan and Generac generators
Verified

Hello, my name is ***** ***** I am going to assist you with this.

At 5 years, it is definitely time for a new battery.

The 13.5 volts you are reading is not the battery voltage - it is the voltage from the charger output. A fully charged 12V battery in good condition will read 12.6 volts.

You will need to do a manual maintenance reset to clear the battery warning.

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Customer reply replied 2 years ago
Actually Hank, that 13.5 volt reading was with the battery sitting on my workbench. Not connected to the genset.
Technician: Hank F., Technician replied 2 years ago

Was that immediately after removing from a charger? A 12V battery will only read 12.6V, after resting for 24 hours.

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