DC/DC converter is on all the time

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astar
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Last seen: 6 years 2 months ago
Joined: Friday, January 11, 2008 - 22:11
Points: 158
DC/DC converter is on all the time

I'd been wondering why the batteries drain so fast while the scooter is sitting in my garage, so I decided to do some investigation. The circuit diagram shows the DC/DC converter is on whenever the breaker is on. I also have a PakTracker, so that will also draw some current. After a full charge with the breaker OFF, I dropped from 64.5 volts to 64.1 volts after 4 days. Trying the same thing with the breaker ON dropped the voltage by the same amount in only 4 hours! So from now on I will turn off the breaker whenever the scooter will sit for more than an hour. I thought others might want to know this too.
Notes - I have a replacement DC/DC converter from EVTA, which is working fine so far.

e-doggies
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Joined: Sunday, December 30, 2007 - 10:15
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Re: DC/DC converter is on all the time

Does turning on the breaker energize your controller? If the caps have drained, I would think there would be a inrush spark across the contacts of the breaker every time you flip it on. A pre-charge resistor would elimnate the arcing and potential welding. But then you might want to have a switch for the PC resistor or it will be on all the time.

astar
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Last seen: 6 years 2 months ago
Joined: Friday, January 11, 2008 - 22:11
Points: 158
Re: DC/DC converter is on all the time

Turning on the breaker enables the DC/DC converter. Then the ignition key has to be turned on. I also have a contactor installed, which does not turn on until the 12v from the ignition is enabled. That said, I don't have a pre-charge resistor on my Kelly Controller, and I'm told I should. The 12v from the ignition goes to both the contactor and the controller at the same time. I've been running without it for many months without any problems so far. If you want to make a thread about pre-charge resistors, please be my guest, but let's not use this thread please.

ZEV 7100 Alpine
Fort Collins, CO

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