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Unread 07-11-2019, 04:06 PM   #1
Not Yet Wild
 
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Default Batteries only charging to 45 volts

I replaced all my batteries this past week and have not been able to get them to a full 48 volts charge. They were at 44 yesterday and since then they have only gone to around 46 volts. I checked the water level and all are good. I do have the yellow colored OBC light that comes on every once in a while but does not stay on. I followed the procedures list by STICKY and so far all is good. Can someone tell me what might be going on? Is there anyway to actually check the chargers output and if so what should it be reading. Thanks
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Unread 07-11-2019, 04:11 PM   #2
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Default Re: Batteries only charging to 45 volts

simple things first....are they the correct batteries that total 48v. are they correctly wired in together, positive to negative etc. etc.... did someone sell you a junk battery.
measure voltage at the main while charging, it should be well over 48 from the charger
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Unread 07-11-2019, 04:22 PM   #3
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Default Re: Batteries only charging to 45 volts

Yes they are the correct batteries totaling 48 volts, they are wired correctly and when I first put them in from the golf cart shop I believe they I checked them and they read 49 total volts. When you say "main" are you talking about the charger? how do I go about testing the voltage coming from the charger, does it have to be plugged into the cart and the electric outlet or just into the outlet and not the cart? Thanks
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Unread 07-11-2019, 04:31 PM   #4
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Default Re: Batteries only charging to 45 volts

Plug the charger into the cart and let it cycle on. While it's charging check the voltage between the pack (+) and pack (-) terminals.
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Unread 07-11-2019, 04:41 PM   #5
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Default Re: Batteries only charging to 45 volts

Plug the Charger into the wall and into the cart. Wait for it to turn on. Make sure the ammeter needle goes up to indicate that it is actually charging.
Check the charging voltage at the main pack positive. That's the one with the cable that goes to the solenoid. Your Positive charge lead from the receptacle should be connected to that same terminal.

Sounds to me like either one battery is reversed, or the positive charge lead is on the wrong terminal. Could have a dud battery. Check the voltage on EACH battery individually while it is charging. With brand new batteries they should all be very close to the same. A brand new pack that only reads 49V is a bit of a worry IMO. That could either mean thay sat around n a shelf for a long time, or one of them is faulty.

My battery supplier sells so many batteries I always end up with a set fresh off the delivery truck, and they tend to measure around 50.5v every time. Sounds like a small difference, but it actually does matter when talking about State Of Charge on a brand new pack.
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Unread 07-11-2019, 05:25 PM   #6
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Default Re: Batteries only charging to 45 volts

Just went and checked them with the charger on, read total volts of 45.4, checked each battery separately and they all read 7.57 or 7.58, one read 7.5. I believe as stated above when I installed them the total volts was 50.3 somewhere around there.
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Unread 07-11-2019, 06:05 PM   #7
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Default Re: Batteries only charging to 45 volts

Which charger do you have?
When you plug it in, you hear it click on and the transformer hum? what does the ammeter do? Should go way up over 15amps and stay there.
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Unread 07-11-2019, 06:26 PM   #8
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Default Re: Batteries only charging to 45 volts

I have a Schauer model # Jac1548h, it has no type of meter on it to see if it goes to 15 amps, as far as hearing it click or humming when I plug it in I don't hear a click, only the fan motor running.
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Unread 07-11-2019, 06:37 PM   #9
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Default Re: Batteries only charging to 45 volts

That charger cannot be used with an OBC.
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Unread 07-11-2019, 06:45 PM   #10
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Default Re: Batteries only charging to 45 volts

Ah, ok. Those aren’t the best, but a 15amp charge rate should still do the job. How long have you had that charger?

First you’ll Need to closely check the wiring from the charge receptacle to the batteries and make sure it’s connected properly.

With that charger you should have your charge Positive going to the main pack appetitive terminal. Negative (Black wire from receptacle) connected directly to the main pack negative, or to the B- terminal terminal on the controller. If the black wire goes to the OBC it will not charge properly.

There is a fuse on the back of the receptacle in a clear plastic cover. Make sure that fuse is not blown.
You should be able to verify that there is full pack voltage present at the charge receptacle with a multimeter.
I can’t tell if that charger has a removable cover, but if it does you should be able to open the charger and find the two wires from the charge cord. Leave the AC cord unplugged from the wall, plug the DC cord into the cart and see if you get pack voltage on the two wires inside the charger. If you have pack voltage reaching the charger, plug in the AC cord, turn the charger on and recheck the voltage on the two DC charge wires in the charger. If you have no change in voltage, I would have to guess the charger has bit the dust.
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