Charger no shutting off.

[Ralph289]

Just got my 2010 RXV 48v today for the wife and she LOVES it ! (I do too. ) But I THINK I have a problem and since it is still under warranty wanted to check with you guys before looking like a fool as this is my first cart.
Cart has 4 NEW Trojan 12v batts. and the cheap charger (used) that came with it is a PowerWise QE. I plugged it in to charge about 4 hours ago and is still charging and battery gauge was just below full. I saw the batterys boiling some and decided to check the voltage with a MM. WHILE charging it read 58v. and the green light was STILL flashing on the charger. I pulled the plug and checked the batterys with the charger unplugged and it read 54v.
Is this charger bad and not cutting off ? Hate to mess up the new batterys in this nice "new" (refurbished) cart.
THANKS

you need to let it run till it shuts pff .. you readings are low ... it can take up to 20hrs for new batteries to fully charge
link ===> http://www.buggiesgonewild.com/elect...batteries.html

[Ralph289]

Originally Posted by crash test dummy

you need to let it run till it shuts pff .. you readings are low ... it can take up to 20hrs for new batteries to fully charge
link ===> http://www.buggiesgonewild.com/elect...batteries.html

Even though the Multi-Meter is reading 58V ?

yes at peek charge you will see 60v+ .. remember that is surface charge you are reading and it will settle down after 12h, it should read 50.9v for 100% charge

btw .. my 36v will show 44.5v before it shuts off .. then settles to 38.2v

[Ralph289]

Originally Posted by crash test dummy

yes at peek charge you will see 60v+ .. remember that is surface charge you are reading and it will settle down after 12h, it should read 50.9v for 100% charge

Ok so I was just reading the surface charge, I will put it back on charge, think I should let it go overnight or just start in the morning ? I may have a hard time sleeping with it on charge

thats up to you .. i sleep fine with mine charging on the other side of my wall ..
btw charger and cart have fuses to prevent overload

[Ralph289]

THANKS for your help !
Will post pics of the cart when the weather gets better here.

Originally Posted by Ralph289

THANKS for your help !
Will post pics of the cart when the weather gets better here.

yea .. got 5" today

[rib33024]

Yes we like pics


when your cart is fully charged the battery pack will get up to 60 - 65 volts", is correct.
In fact, the charger may have to take a 48V battery pack up to 67V, or above, to fully charge it.
On the other hand, 59V may fully charge a 48V battery pack.
The voltage it takes to fully charge a 48V battery pack depends on who manufactured the batteries in the pack as well as their condition.



By definition, a lead-acid wet cell is fully charged when the specific gravity of the electrolyte ceases to increase while a charging current is passing through it. Since open-circuit voltage increases/decreases as the electrolyte's specific gravity increases/decreases, open-circuit voltage is an indirect or secondary means of monitoring the electrolyte's specific gravity and is often used to do so.

An ideal charger would monitor pack voltage and when it ceased to rise over a predetermined period of time, it would stop the regular charging mode and go into a float charge mode, however few, if any, chargers typically used by golf cart owners are ideal. Most of them simply shut off at a predetermined voltage that is high enough to almost fully charge most battery packs without being so high that repeated use would significantly harm battery packs that are fully charged at the lower end of the typical voltage spectrum needed to fully charge a battery as determined by empirical data.

Here is Trojan's recommended charge curve for a single (2V) deep cycle wet cell. There are 24 cells in a 48V battery pack, so do the math and you get 58.80V to 66.96V. However, Trojan uses an electrolyte that is 27.7% sulfuric acid by weight (SG = 1.277) and other battery manufacturers use different concentrations, so the on-charge voltage that is typically reached when their batteries are fully charged, will be higher or lower.