MjrBad
I have Generac Model 5506 20kw generator with Load Shed Transfer Switch. Unit was install approx 2 years ago.

Up until about 2 weeks ago, the Baterry Charger has maintained a 13.4 volts charging level. 2 weeks ago. the rate was up to 14.2 volts. As of this morning, the rate has increased to 14.8 volts.

I have been checking the electrolyte in the battery. Level is OK.

What is causing this increase in the charging level? What do I need to do?

Thanks for your help.

MJB
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Skip Douglas SkipD
You definitely need to replace the charger.

My preference would be one of the well-known battery maintainers rather than a replacement Generac part. That may, though, require some mods such as adding a receptacle in the generator housing (which I have done to mine).
Skip Douglas
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DanB
only 2 years old. Didnt Generac change the design and all battery chargers (looks like a wallwart) are now in the transfer switch?

if so, should be easy peasy. I too would suggest a non-Generac, name brand unit.
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MjrBad
Battery Charger Recommendation

First, my Generac Model # 5506 with "Load Shed" transfer switch is covered under extended warranty until 2014. If it turns out that the Factory Battery Charger is defective, do I need to have it changed out with another Factory Charger or can I install another make?
If I can change to another make, without harming my warranty, which make and model should I use?
Also, I see where some of you have recommended a Battery Tender but mention that you have to install an electrical receptical in the Generator. Why? in my system the charger is wired into the Transfer Switch. Thanks
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genme
DanB;10890 wrote:
Didnt Generac change the design and all battery chargers (looks like a wallwart) are now in the transfer switch?
The newer Nexus air-cooled units have the charger integrated into the control board. I assume the control board is more expensive than just a charger, so this may not be a great thing for the consumer (if the charger goes bad.)
Model 5875, Nexus controller, 999cc Engine, 20kW LP, 2011
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bucdup
Get the Battery Tender. I believe the waterproof one (not that you need it) is appx. the same size and shape of the Generac. Install it how you like, but with some modification it could be installed in the same manner as the factory charger - (hint, hint)
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DanB
genme;10976 wrote:
The newer Nexus air-cooled units have the charger integrated into the control board. I assume the control board is more expensive than just a charger, so this may not be a great thing for the consumer (if the charger goes bad.)


yikes, with the "unpublished" history that Generac has had with their chargers, this doesnt sound good at all, unless the entire on-board charging circuitry was designed by someone like Battery Tender, etc..
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genme
Maybe someone with an electronic copy of the Nexus Diagnostic Repair Manual can copy and paste the Battery Charger section here. It's interesting, but it will take me a long time to retype five good sized paragraphs. Pages 90 & 91 in my manual.
Model 5875, Nexus controller, 999cc Engine, 20kW LP, 2011
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Skip Douglas SkipD
I just looked at a copy of the Diagnostic Repair Manual 0H9172 and get the distinct impression that the battery charger for the 5800 series generators is a part of the controller circuit board. There is no schematic of the controller board in the book, however. I hope to find out if such a schematic is available to help me analyze the circuit.

The description of the how the charger functions is definitely not anything like the way a battery maintainer works. Once it gets triggered to operate, it runs for 18 hours and the voltage it supplies is based on ambient temperature.

If I had one of those generators, I would be checking the battery electrolyte level AT LEAST quarterly.
Skip Douglas
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