Battery Drain 48V Precedent

[rock2183]

I have a 2007 Club Car Precedent 48v. several years ago my buddy and I replaced our batteries. About a year or so after replacing my batteries my cart was losing power and would only make about 27 holes tops. The guy I bought my batteries from checked and said I have a "draw" on my battery like I have a radio on or something. I have nothing on my cart drawing from the batteries. P&P came and looked at my cart and replaced the OBC board which seemed to help a little but then same problem. Had cart checked again and was told I had one bad battery which I had all replaced again. It should be noted that my buddy still has the ones we put in together and I'm afraid if I don't locate what is causing the draw I will replace batteries about every three to four years.
Any ideas what would cause this? switch relay anything?

[Night life]

Not sure about the battery draw, but 3-4 years is about right. The best advice I could give you is to invest in a smart charger like a dpi accusense, bypass your obc and see how that works. The charger will keep the batteries in float mode (fully charged) when not in use.

[rock2183]

Thanks for the advice. I'll look into that, however on the draw I believe that if I pulled my cart out and left it sit the batteries would go dead without driving the cart like if I had a radio on drawing on the batteries even though I have nothing running.

[NoleFan4Ever]

Do you have a Digital VM installed? If not, get a hand held and fully charge the pack and wait ~12 hours or so and check the pack voltage. You should be around ~50.8v or so. Wait 24 hours and check the voltage again. If you have a strong draw your voltage should be down 3-5% to be effecting the battery duration you are seeing. If it is, unplug and replug it to fully charge it again. Then flip it to Tow mode and do the same thing again. If that prevents the voltage loss then you can systematically start probing the circuits to see what is still pulling a draw while the cart is off. Or if that worries you then you can start unpluging circuits and cables one by one until you see the draw stop and then replace or correct that item.

There are many ways to do it, but that is where I would begin.

[ThreeCW]

Originally Posted by rock2183

I'm afraid if I don't locate what is causing the draw I will replace batteries about every three to four years.
Any ideas what would cause this? switch relay anything?

It sounds like you have a parasite load that is drawing down you batteries.

Here is a good video with a step by step process to identify where your parasite load is coming from:

https://www.youtube.com/watch?v=KF1gijj03_0

The video is for a car but the same logical process can be followed for your golf cart.

Regards, 3CW