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Battery Equalizer Schematics Rev 1.0

Porsche 914 EV Conversion

I'll have to modify the circuit with a voltage doubler in the final stage to work with 8-volt golf-cart batteries for the 914 EV kit. By clicking on the images, you can get a much larger version of the pictures. Any feedback on how to improve the circuit would be welcome.

Golf Cart 147
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Test Drive to Work

Porsche 914 EV Conversion

I'm not sure how much current these golf cart batteries are designed for. The battery voltage sunk from 152 volts at rest down to 132 volts after awhile during heavy acceleration. I think people experience cognitive dissonance when they see a little red Porsche sports car being the slowest car on the road.

Golf Cart 100
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Batteries are Here!

Porsche 914 EV Conversion

After much time on the phone with UPS Freight, the 8-volt golf cart batteries finally showed up today! Although the Bill of Lading clearly stated that this was a residence requiring a liftgate, UPS seemed to overlook that part of the order. Here's the semi that showed up at my doorstep to block off the street.

Golf Cart 100
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Measuring State-of-Charge on Lead Acid Batteries

Porsche 914 EV Conversion

The 914 AC kit uses 8V golf cart batteries and I'm wondering if different batteries like Hawkers or Optima Yellow-Top batteries would be better. Both US-Battery and Trojan have 8-volt golf-cart batteries. With the AC system, I'll probably be pulling less amps and am looking forward to the extended range.

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Impatience.

Porsche 914 EV Conversion

I should be getting the 18 8-volt golf-cart batteries from American Battery Company early next week. I've sent three e-mails and one phone call to Electro Automotive asking about the status of the battery racks/boxes and received no reply.

Golf Cart 100
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The Great Desulfation Experiment

Porsche 914 EV Conversion

Above is a picture of a heavily sulfated 8-volt golf-cart battery I acquired yesterday. volts which should go up over time if the battery desulfates. I still have two other 8-volt batteries (top picture) that I cleaned up today that also needed about half a gallon of water to fill each.

Golf Cart 100
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More Delays

Porsche 914 EV Conversion

Besides, the PowerCheq units only handle 12 volt batteries and the ElectroAuto kit is designed for 8-volt golf-cart batteries, so a homebrew system will be required.

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