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Battery Not holding a Charge Generac Model G0070431 22KW

Posted: Fri May 10, 2019 11:26 am
by LPolitewicz
My battery died recently on my 22KW air cooled. I replaced the battery with the 26R and 2 days later I am getting a LOW BATTERY alarm on the display. Checked the voltage and it is at 10 V. Where is the charging unit? And how could I troubleshoot it ?

Re: Battery Not holding a Charge Generac Model G0070431 22KW

Posted: Fri May 10, 2019 11:40 am
by Chris
The charger is built into the controller on this unit. You should have 120V input on the T1 wire which is power for the charger internally.

Does the display also say Charger Missing AC?

Re: Battery Not holding a Charge Generac Model G0070431 22KW

Posted: Fri May 10, 2019 12:08 pm
by LPolitewicz
Yes it said missing AC. I have 120 V on the T1 wire. Now it says low battery.

Re: Battery Not holding a Charge Generac Model G0070431 22KW

Posted: Fri May 10, 2019 2:31 pm
by Chris
If the screen said Charger Missing AC, that means that the battery charger inside the controller isn't seeing 120V power for some reason... I would check your connections at the generator and make SURE that you actually have 120V power on the T1 wire. Can you post a couple of pictures of the install?

Re: Battery Not holding a Charge Generac Model G0070431 22KW

Posted: Sat May 11, 2019 4:51 pm
by LPolitewicz
Chris. I found the terminal block that the T1 wire was connected to in the unit was not gripping the wire properly. I was able to pull the blue wire out without pressing down on the release +. I tried several times to land the wire correctly but the block wouldn't hold it in place. So I removed both the blue and the T1 wire and connected using a solderless yellow push in connector. The Missing AC fault is now gone. However I still have the low battery. I am going to see if it charges. If not I will just replace the battery.

One other question how do I get the firmware update for my controller. I cannot find it on the generac website.

Re: Battery Not holding a Charge Generac Model G0070431 22KW

Posted: Sat May 11, 2019 7:51 pm
by 78buckshot
The on-board charger is not designed to bring a dead battery back, you may damage the charger. I would remove the battery and charge it with a stand-alone charger.

Re: Battery Not holding a Charge Generac Model G0070431 22KW

Posted: Sat May 11, 2019 10:58 pm
by Chris
Like Buckshot said, I'd charge the battery (removed from the gen) and then try it.

As far as firmware goes, that's really a dealer only item. I'd contact your local dealer and see what they would charge to make a visit and install. Takes about 30 seconds... I personally like version 1.17 best as 1.18 and 1.20 are designed for the Auxiliary Shutdown kits and if not installed could possibly cause a false trip.

Re: Battery Not holding a Charge Generac Model G0070431 22KW

Posted: Tue May 14, 2019 8:50 am
by LPolitewicz
Ok I replaced the battery yesterday and now I am getting a charger warning on the LCD. Is the charging unit on the controller the issue? Could you get me a part number? Serial # 3002664643

Re: Battery Not holding a Charge Generac Model G0070431 22KW

Posted: Tue May 14, 2019 9:38 am
by Chris
This is the controller that fits your generator. https://shop.gentekpower.com/products/g ... trol-panel

You should be able to monitor battery voltage pretty easily with a meter. Check the battery voltage before cranking the gen, should be around 13.5V or so, then crank the gen and it should drop to around 11.8 or so, then you should be able to watch it slowly climb back up to the 13.5.

If the battery is not charging, the controller will slowly kill the battery.

Re: Battery Not holding a Charge Generac Model G0070431 22KW

Posted: Fri Aug 30, 2019 12:35 pm
by Lhren
Reviving this thread as I have the same issue with the same unit. Unfortunately, I don’t have a lot of time for diagnostics as Hurricane Dorian is making its way toward Florida.

My goal is to have my generator reliably in standby mode for when it is needed in the short term- my question is:

In lieu of diagnosing/fixing the “charger missing AC” problem, can I connect a maintenance battery tender to the battery and achieve the same result? Would doing so potentially cause any damage to the generator once it turns on? Can the maintenance charger be left connected once the generator takes over for utility power, or does it need to be disconnected as soon as the generator motor starts?

I suspect the integrated charger on the Generac is either miswired, or has gone bad and a new control panel is needed. I’ll certainly get a pro to check all that out once the immediate hurricane situation has passed.

Any help on these short-term band-aid solutions would be appreciated!