Porsche 914 EV Conversion

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Fixing the DC-DC Converter

Porsche 914 EV Conversion

I have no idea why or how the DC-DC converter blew, but I suspect it will probably happen again given that I've only really driven the car for four days. The other idea is just to add a green LED to the 144V inside the converter just past the fuse so that I can see at a glance if the fuse has blown.

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A Cheap Balancer and Transmission Issues

Porsche 914 EV Conversion

After talking with some engineers at HP and mulling over some ideas, I came up with the attached schematics for an inexpensive battery balancer. This one relies much more heavily on complex PIC programming and uses an off-the-shelf laptop or inkjet-printer power supply to deliver an isolated source of power for the battery charger.

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More Tools (i.e. toys.)

Porsche 914 EV Conversion

I've been mulling over some ideas for the past few days. The 914 doesn't run well at all when its cold and after going to the DEQ, I realized that I'm going to need a lot of work to get the car to pass emissions (it's a rather gross polluter right now).

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My 2007 Dream Project

Porsche 914 EV Conversion

After seeing the movie Who Killed The Electric Car , I got the nutty idea earlier this year to purchase an all-electric vehicle to commute to work. The motivation was to see if I could get by with as little oil products as possible.

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Initial CCPower Schematic

Porsche 914 EV Conversion

Initially, I cringed because there were no kick-back diodes in the circuit, but I think that C7 and R16 (2 watt resistor) send any kick-back currents into the opposite inductor when the FETs let go. Thanks for your input. Cheers, Tim.

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Hoods Installed

Porsche 914 EV Conversion

With the rain gutter gone, perhaps it wasn't such a good idea to keep the two drain funnels and tubes in place. I installed the engine compartment cover this morning and realized that the rain gutter would have to be completely removed to not interfere with the rear battery box.

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More Delays

Porsche 914 EV Conversion

After listening to him, I get the idea that the biggest issue with these vehicles (no surprise) is maintaining battery health. Quite a fine fellow, he's been through three different battery types. He also highly recommends the BMW320i brake upgrade for the 914 to handle the extra weight of the batteries.

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