Buggies Gone Wild Golf Cart Forum - View Single Post

bronsonj · 11-23-2021, 08:43 AM

My Chevy Volt pack was just like VA's leaf pack until I added a voltmeter that's always on. Of course, it takes a long time to move the pack V by 0.1V on the meter, but it added a very slow drain.

Do you have a volt meter on your pack that's on all the time? Could be that meter and the BMS are each adding a small drain.

VA, could a bad cap in the controller add a drain too? I know the resistor across the solenoid keeps the caps charged and am wondering if a bad cap could cause a drain. Guessing if that were true then the resistor across those solenoid leads would be warm.

--- edit ---
What kind of drain are you seeing? 0.1v in a day or two? 0.1v in a week? 1.0v in a day? Depending on what you're seeing may give us a clue. Could be your solenoid is welded shut so it's always full power to the controller even if the controller is off.

11-23-2021, 08:43 AM	#3
bronsonj Gone Wild Join Date: Jan 2013 Location: Saint Petersburg, FL Posts: 2,089	Re: Slow drain on battery My Chevy Volt pack was just like VA's leaf pack until I added a voltmeter that's always on. Of course, it takes a long time to move the pack V by 0.1V on the meter, but it added a very slow drain. Do you have a volt meter on your pack that's on all the time? Could be that meter and the BMS are each adding a small drain. VA, could a bad cap in the controller add a drain too? I know the resistor across the solenoid keeps the caps charged and am wondering if a bad cap could cause a drain. Guessing if that were true then the resistor across those solenoid leads would be warm. --- edit --- What kind of drain are you seeing? 0.1v in a day or two? 0.1v in a week? 1.0v in a day? Depending on what you're seeing may give us a clue. Could be your solenoid is welded shut so it's always full power to the controller even if the controller is off.