olduhfguy
I have owned one of the 15kw Watchdog 05382 (Guardian) generators for about 18 months now and have noticed that the built-in charger seems to be overcharging the starting battery. The electrolyte level will lower much more quickly than I consider normal. I have seen other posts suggesting replacing it with a higher quality external charger. Is this a known problem, and if so does the factory recommend something other than replacement ? The generator has been quite reliable other than this. It was converted from Natural to LP, mounted on columns on a steel frame to elevate it above the ground to prevent it from being covered in snow. I saw nothing unusual in the break-in oil so I'm confident that the unit is in good shape. FYI - This was purchased from a local surplus/salvage dealer and until I read your forum I did not know the story behind these machines, thanks for the info !
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Skip Douglas SkipD
Generac has provided a very different style battery charger with newer model generators. From what I read here, though, they have not admitted to problems with the old style charger though most seem to do what you are seeing yours do.

My suggestion:[LIST]
[*] Install a new 120VAC receptacle inside the generator's housing fed by a 120VAC branch circuit from a breaker which the generator powers when running (and, of course, is powered by utility power).
[*] Remove all of the wires plugged into the battery charger.
[*] Obtain a battery maintainer charger - either a Battery Tender brand or a Schumacher (available at most Wal-Mart stores).
[*] Install the battery maintainer, plugging it into the new receptacle.[/LIST]
Skip Douglas
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ebellinder
Installing a battery tender on a 4390-3

Guys

This may have been answered in a previous post but if it was I did not catch it.

I am finally going to disable my internal battery charger and install a battery tender.

If I am am correct in my approach I should be able to remove wires 224B and 225 B which supply either 120 vac line power to the internal charger or generator power to the internal charger.

I should then be able to take those two wires that were connected to the internal charger and install an a/c outlet inside the enclosure and plug in my battery tender. At this time I should always have either utility or genertor power (120vac) for the battery tender

I should then be able to remove low voltage wires 0 (Neg) and 13 (Pos) from the internal battery charger and attached those to the respective + and - leads from the battery tender

Am I missing anything?

In this manner I believe I can power the battery tender using all original wiring that was connected to the internal charger and I can install an outlet inside of the generator enclosure without requiring a new external a/c source.

Can anyone check my logic on this plan
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Skip Douglas SkipD
ebellinder;8192 wrote:
Can anyone check my logic on this plan
What model generator are you using?
Skip Douglas
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ohmslaw
The charger wires 224/225 are only 16Volts. You cannot hook the battery tender to them.
Tim
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Skip Douglas SkipD
ebellinder;8192 wrote:
Can anyone check my logic on this plan
Please read post #2 in this thread.
Skip Douglas
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ebellinder
I knew my plan was too simple

The low voltage output of the transformer was missed

Thanks for the help
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