The making of an all electric EV VW Cabriolet

This blog follows my process of converting a 1992 VW Cabriolet to an electric vehicle. As an EV it is quiet, dependable and has plenty of pep and range to get around town.

Tuesday, September 08, 2009

All the better to see you with

And now to start catching up for the last two and a half years - somewhat chronologically:

To watch the batteries a little better I added a red LED digital volt meter. It's bright enough to read except in bright direct sunlight, and matches pretty well with my handheld meter. I'll get a much better read on the batteries now, and can watch them in real time. The meter updates a few times a second.

The good is that its:

-cheap
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-isolated power and sense pins

The bad is that it's cheap. I burnt two of them before I figured out that it can't really handle the high voltage leakage paths from the pack to ground. When I hit the accelerator, the meter goes crazy, and in a few days dies with one part burnt off the PCB. After looking at the toasted parts I figured it must be arcing from high voltage to the house ground, and probably due to the noisy voltage spikes when the controller is actively chopping the DC. A $5 isolated 12V-12V DC-DC supply on the 12V power input has fixed it, and it's still running strong two years later.

56 Comments:

At 11/4/09, 12:14 PM, Blogger Unknown said...

I've been considering converting my '86 cabriolet for a while. If you've got a moment I'd like to pick your brain and make sure I know what I am getting into.

 
At 11/5/09, 8:04 AM, Blogger Peanut Butter said...

Sure! - I'm in Atlanta as well. Have you been to any of the Atlanta area EV group meeting? The next one is on the 18th, I'm planning to be there. All the details are on evclubsouth.org.

 
At 11/5/09, 1:01 PM, Blogger Unknown said...

I haven't made it out yet - but I'll plan on making it on the 18th. See you there.

 
At 11/18/09, 5:18 PM, Blogger Unknown said...

still planning on attending the meeting?

 
At 11/22/09, 11:45 PM, Blogger Peanut Butter said...

Unfortunately I couldn't make it, sorry! Something always seems to come up those nights, and the meeting in Vinings is out of my range. I'm driving it in to work more now, and I've just about got the heater installed which will help a lot.

 
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