What are the correct voltages for a 48v charger to go up to before it cuts off?

[Jeffreynmandy]

I bought a used eagle pro 48v 18 amp charger. I want to make sure it's working correctly. I looked online but had trouble finding the info.

What is the safe voltage for the charger to let the batteries get to before shutting off. The LEDs on my charger indicated it was in the finishing stage and the voltage on the batteries read 61v with a meter. I wasn't sure if that was ok so I unplugged it. The voltage then went down to 54.


I know the resting voltage should be around 51 after 12 hours, but couldn't find what they can safely go up to before shutting off.

I just want to make sure the charger isn't overcharging.

[scottyb]

You were almost there. cut off is around 63v no harm in letting it go 65 66 even 67v if you are trying to confirm cut off is working or not... different make batteries have varying cut off points.

[Jeffreynmandy]

Originally Posted by scottyb

You were almost there. cut off is around 63v no harm in letting it go 65 66 even 67v if you are trying to confirm cut off is working or not... different make batteries have varying cut off points.

Thanks for the reply. I just noticed it was in finishing mode for a couple hours and didn't know if it was stuck.



I have a unrelated question since you sell parts. I have a 650 amp alltrax, emp motor, 2awg cables, and 48 v upgrade on a 96 ezgo series cart.

The 48v solenoid I had didn't work, so for now I have a 36v solenoid on it and factory f/r switch.


The installer recommended just leaving them in until they quit. He said he has seen them last several years.


Am I losing performance through this, and am I risking damaging something else if it one goes bad while driving?

[scottyb]

You need a solenoid rated for 400a continuous 48v, a HD F&R or reversing contactor set up and maybe a cart mechanic with internet access

[cgtech]

Just "leaving them 'till they quit"- yep, sounds good to me. Lol

[tag50]

Did he offer cab fare and free towing? With advice like that, it seems to me he should have some chips in the game.


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[cgtech]

I have seen "proper voltages" exceed 65v for US batteries with the clubcar OBC. I cringe and look away. Clubcar does it with their "program". Ouch, the OBC allows for some high voltages. Look at "battery university dot com" if you want to learn the battery ways.

[cgtech]

I would never subject my own batteries to that level. See ya'll tomorrow for discussion time....

[scottyb]

The problem with using components know to be under-rated or not compatible with your voltage increase and high amp control is failure is not always a boring or convenient event. Murphy's law says when the F&R fails you will be crossing a creek with the flood waters rising, 5 miles from home, near dark, in the rain, and with your wife onboard. Another thought is for safety and catastrophic loss. A welded solenoid can result in a no disconnect situation and some failures can result in controller loss, since the AXE650 has no reverse polarity protection.
All in all you would be wise to upgrade the system components to the specs laid out by Alltrax for the 650 amp control.

[Jeffreynmandy]

Originally Posted by scottyb

The problem with using components know to be under-rated or not compatible with your voltage increase and high amp control is failure is not always a boring or convenient event. Murphy's law says when the F&R fails you will be crossing a creek with the flood waters rising, 5 miles from home, near dark, in the rain, and with your wife onboard. Another thought is for safety and catastrophic loss. A welded solenoid can result in a no disconnect situation and some failures can result in controller loss, since the AXE650 has no reverse polarity protection.
All in all you would be wise to upgrade the system components to the specs laid out by Alltrax for the 650 amp control.

Your convincing me.... Should replace the solenoid or f/r first? It's a street/grass only cart.


Also, I think I know what's going on with the charger. It's staying in the finishing mode for what seems like forever. But the voltage is staying right at 63.3.

In the manual it says if the charger is left plugged in it will do a monthly balance on the batteries with the two LEDs blinking. And then do it each month after that.

How it knows this I don't know, I opened it to look at it, and it doesn't look too complicated in there.


Hopefully that's all it is. I'll update to say if that's what it was.