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Old 05-12-2015, 11:23 AM   #1
polocheck
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Default Batteries not holding 100% capacity...

I have 09 RXV with Trojan T-1275 Plus batteries dated 3/14 I installed last year. After a 12 hour rest they are showing 50.4v. I have always checked and maintained water levels (distilled only). I followed proper break in procedures and batteries have never been below 50%. Is there a way to get it back up to 50.9v? I have a Powerwise Qe charger. Would unplugging and replugging in charger say 12 hours after it completes a charge help/hurt batteries? For what its worth I have 30amp converter that powers lights, USB port, and Bluetooth stereo.

Last edited by polocheck; 05-12-2015 at 11:52 AM.. Reason: Changed charger type.
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Old 05-12-2015, 12:23 PM   #2
CedzGo
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Default Re: Batteries not holding 100% capacity...

Are you sure that one of your accessories running through the converter don't have parasitic drain? Try unplugging one at a time to see if the voltage drop goes away???
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Old 05-12-2015, 12:49 PM   #3
JohnnieB
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Default Re: Batteries not holding 100% capacity...

First, I'd measure the individual battery voltages.

At 50.4V for the pack, each should read about 12.60V and all four should be withing about 0.2V of each other.

If any are low, give the low one(s) a boost charge with a 12V charger.

If they are all reading within 0.2V of each other, a few back to back charges with your PW-QE may bring the SoC they charge to up. It won't hurt the batteries.

Also, could be a PW-QE issue. What On-Charge voltage does it shut off at? (Should be ~60V, maybe more)
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Old 05-12-2015, 12:50 PM   #4
polocheck
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Default Re: Batteries not holding 100% capacity...

My converter is on a key switch (attached to the solenoid). I have all my accessories wired to a blue sea 2025 fuse box. If it has a drain I should be able to just measure with a voltmeter correct? Or I could just detach the converter from the positive lug on the pack and see what the voltage drop is after 12 hours.
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Old 05-12-2015, 12:59 PM   #5
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Default Re: Batteries not holding 100% capacity...

I saw it at about 65v when it shut off. I also thought about individual battery voltage. I checked that just after I replugged it in for a few minutes so pack was already accepting a charge. I unplugged and let rest for about 5 min. All batteries measure 12.9 or 13.0. Would you assume it would follow the same difference after it rests?
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Old 05-12-2015, 03:56 PM   #6
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Default Re: Batteries not holding 100% capacity...

The individual battery voltages ought to be measured about 12 hours after the charger shuts off, just like the pack voltage.

The differences in voltages 5 minutes after they were on charge might hold true at 12 hours, but it might not since batteries tend to be as unpredictable as spouses.

Another way of checking batteries for proper balancing, is drive the cart for about a mile or so and then wait half an hour before checking the voltages.

------------
Gettin to 65V on charge ought to be fully charging the battery pack, or mighty close to it.

CedzGo might be right about the 45V -> 12V converter having a parasitic drain.
Disconnect it from the battery pack and see what the pack voltage is 12 hours after the charger shuts off.

--------------
Do the batteries ever sit very long in a partially discharged state?
For example, the battery pack in a cart that is only used on Saturdays and Sundays and is plugged into a PW-QE charger after each use, sits in a partially discharged state five days a week.
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Old 05-12-2015, 07:25 PM   #7
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Default Re: Batteries not holding 100% capacity...

Cart never sits in any state of discharge. Charger stays connected until I use it. Reconnected after I finish. I made sure over the winter that charger kicked in when batteries got low. I kept re plugging it in every couple of weeks until I finally realized the charger would automatically kick on when the pack get low enough.
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Old 05-12-2015, 10:58 PM   #8
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Default Re: Batteries not holding 100% capacity...

Got home and checked individual battery levels after approx 10 hours of rest. All batteries measured between 12.58 and 12.67. I unplugged converter from pack at the 48v input and replugged in charger. I'll let rest for at least 12 hours and post results/conclusions. If it is a parasitic drain from converter is there an easy fix? Is it bad for the batteries or just an annoyance?
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Old 05-13-2015, 02:23 AM   #9
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Default Re: Batteries not holding 100% capacity...

Mostly an annoyance, but if your converter is that "dirty" you might want to look into something else.
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Old 05-13-2015, 06:25 AM   #10
Great white north
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Default Re: Batteries not holding 100% capacity...

I would use a separate 12 volt battery for accessories ... For the very reason I do not trust the converter not damaging my battery pack over a long period
Also I have a winch on my cart and you pretty much are going to have to go with a separate marine deep cycle battery for practical use ... I use a 160/amp hr unit .. Put battery in bagwell
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