jniolon
Hello all,
haven't been around for a couple of years... but my Generac always brings me back.

Model 52190 Serial # 4330048 30 kw water cooled natural gas fired standby unit at my home.. connected through a auto transfer switch to meter box/fuse panel..


It's been doing great for a good long while until lately when utility power dropped out and it didn't start up... or course it was 11 pm and raining like crazy... checked panel and it said 'battery low'... I jumped it off and survived the night put a charger on it the next day and all was fine till the next exercise cycle... click..click was all it offered... battery dead again... well, it was 4 years old... so Got a new battery and all is well for two weeks... same thing ...dead battery... time to trouble shoot

after charging battery voltage was 12.6. when running voltage was 13.9 so it was charging...

figured something was pulling the battery down. Pulled the negative cable and checked current draw from cable to post and found a 2.2 amp draw !

so here I am seeking help... where do I start looking for a parasitic load ??

thanks
John
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BrentB
That is how to read the charger output to battery. Means the charger is supplying 2.2 amps to the battery. Problem is more likely dirty terminals or connection points.
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BrentB
If you checked that " draw" while running, you are reading the alt. Check again with generator off. You may have a problem with the on board charger when not running.
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jniolon
BrentB;53084 wrote:
If you checked that " draw" while running, you are reading the alt. Check again with generator off. You may have a problem with the on board charger when not running.



battery voltage when running was 13.9
so the alternator is charging, right ??

took the reading between the neg battery cable (disconnected) and the battery post and that's where I got the 2.2 amp draw... would that be the charger causing that reading ???

so you're saying that the draining of the battery is a problem with the onboard battery charger ??

sorry for the dumb questions... I'm just trying to make sure I understand what you're telling me
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BrentB
Having a meter between the negative cable and the negative battery terminal is how we check the charger. If the reading is taken while the generator is running, the alt. is producing the D.C. you are reading. If you test the same way with the generator off, you take the D.C. alt. out of the equation.
The PCB has a constant draw on the battery when in stand by. If the on board charger isn't working, the dead battery is a normal condition of normal draw from the PCB.
On board charger is located inside the control box, behind the PCB. Has an amber and a green LED green indicates power in, amber indicates charge in progress.
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jniolon
ok... found what I assume is the battery charger... it has a 5 amp fuse that was bad... replaced the fuse and I've got a green and yellow light now... sound like things are working as they should now ???
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BrentB
SCORED!!!!!!!!!!!!! Yes, that was the problem!
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jniolon
thanks Brent... you guys on this board are the best.. never fail to impress me with your depth of knowledge and willingness to share it with us rookies...

john
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78buckshot
I for one enjoy this type of work, it's a great career for someone with electrical/mechanical interest so the knowledge and experience come pretty easy for us. When your happy with what God gave you it's a pleasure to share it.
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restosud
now keep an eye on the fuse to ensure there is no other issue.
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