Yamaha 48volt charger

JWATZ80

I have an electric yamaha cart and the 48v charger. I left it unplugged in my heated garaged for about a month this winter now it won't charge. Does this charger have a trickle charge if i leave it on overnight will it charge up? Thanks, help please

BGW

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smallblock450sl

First, Welcome JWATZ80 As you saw in another post, I normally use a 36 volt "timer" charger to "force charge" the 48 volt battery set to a voltage of over 44 volts. It useually takes 3 to 4 hours. If you don't have a 36 volt timer charger and dc jumper setup like I use, You can use a 12 volt car charger, charging 2 batteries at a time to get the voltage up...useually 2 to 4 hours per 2 battery grouping. Since your car was only left uncharged in a heated garage, just charge the batteries till the set reaches at least 44 plus volts. Then your Yamaha/MAC charger should turn on and charge, but it will most likely will go "abnormal" and stop charging after 2 hours or so on the first charge. Then just unplug and replug to start the charging process again and normally overnite it will show "green", fully charged. After useing and charging the car several times the batteries should be up to there capability again. Your MAC charger is "fully automatic" meaning you leave it plugged in all the time. As voltage drops it will turn on and off to charge the batteries back up, so I recommend while not in use, leave it plugged in. The only problem is if the "AC" power is interupted....it stops the whole process and it would need to be uplugged and replugged to start the charging cycle again. Dang my fingers are tired. Hope that helped alittle. Good luck!

JWATZ80

Thanks for all your help smallblock, I just started the process hope all goes well!! Jwatz

smallblock450sl

Please let us know what happens

Mayfair

Hmmmm ....
I too have a MAC charger, and I was told last year that it was safe to leave it on all of the time which I did for a little while this winter. I first plugged the charger into a Watt Meter so that I could see just how many watts it would draw being plugged in all of the time.

During the "charge up" process, it starts out at around 900 watts, but then drops down to around 700 if I remember correctly. What I found interresting though was that I drew 0 watts once the batteries were fully charged. No matter how long it was plugged it, it didn't seem to go back past 0 watts. This had me wondering if it was indeed charging at all.

Any thoughts?

smallblock450sl

Mayfair, good question. Fully automatic chargers, like your MAC are desighned the go thru there charge cycle and when done turn off or go to "green" lite. Lets say you left it plugged in for a month (and stayed there and watched it) at some point, when the battery voltage dropped enough, the charger would sence it and start the charging cycle for a short period to bring the batteries up to a full charge. Could be days/weeks or a month for this to happen. Yes I do recommend leaving the charger plugged in when not in use. There is one exception....If for some reason the AC power should be interupted...the cycle is stopped and you must verify AC power and unplug and replug in the DC cord to start the charging cycle again. Hope that made sence to everyone.

JWATZ80

Everything went great thanks to you. After that night I unplugged once and then it charged all the way. We're ready to golf again thanks to you. Thanks again Smallblock

smallblock450sl

Wow...you sound gratefull Glad it worked out Can't wait for Sunday at the Masters....it's one of my favorite day's.

Mayfair

Yeah I figured that was what was going on with the charger. I was afraid of OVER charging my batteries and that's why I kept unplugging it. I don't know about anyone elses batteries, but mine seem to "weep" a lot. They're not over filled either. I only fill them to the bottom of the "cone" inside of them.
Any thoughts?

Mayfair

Ok, this whole "Keep the charger plugged in" thing really had me intrigued, so I tested further, and here's what I came up with.

I hooked the charger up, and it pretty much fully charges the bateries so I know that worked, however not touching anything and leaving the cart charging, the batteries slowly started to drop back to 70%. Today I unplugged the charger and plugged it all back in, and sure enough, it started charging again.

I'm curious now if I might have a problem, or if the charger does in fact stop charging once the batteries are fully charged, and doesn't maintain them at all?

Thoughts?