Vespa P200E EV Conversion

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scusi   1 mW

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Vespa P200E EV Conversion

Post by scusi » Nov 07 2021 12:27am

Here's my build so far:
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The goal of this project was not only to build an electric vespa, but also to gain experience building a custom battery pack, wiring power electronics, and programming controls because I will be doing more builds soon. Here’s the project for anyone interested, or if anyone is doing something similar.

I found a P200E that didn't run, and another person wanted the engine, so it sounded like a perfect candidate for the build.

I'll try to post about the build experience and some lessons learned so far. This was an absolute joy to ride and was incredibly quick.



BOM: https://docs.google.com/spreadsheets/d/ ... sp=sharing
Last edited by scusi on Nov 07 2021 1:07am, edited 2 times in total.

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scusi   1 mW

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Re: Vespa P200E EV Conversion

Post by scusi » Nov 07 2021 12:34am

Swingarm:
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The way that the engine originally mounted to the scooter was not compatible with a hub motor, and I could not find an off the shelf solution anywhere, so fabrication of a custom design was the only way forward. I read about JimVonBaden’s conversion a lot which helped me figure out a similar solution for my swingarm.
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The fit was really good, maybe a little tight. The only issue I found was the wheelbase ended up about 25mm shorter than expected.
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I used an aftermarket mount for the mono shock

The swing arm was made using 1" x 2" and 2" X 2" square channel, a 4130 Alloy Steel Round Tube, 0.120" Wall Thickness, 1-1/4" OD, 26mm OD 14mm ID bushings, and a shock mount

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scusi   1 mW

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Re: Vespa P200E EV Conversion

Post by scusi » Nov 07 2021 12:59am

Battery:
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Cells: Samsung INR 18650 25R Lithium Battery Cells - By The Case
BMS: Daly Li-ion 20S 72V 100A BMS

I built the 72V battery from a total of 200 18650 cells (20S10P). I bought two boxes (100 each) from EV West. I knew it would be more work because they aren’t shipped with a heat shrink sleeve or insulating ring pre-installed, but the cost saving in addition to knowing the batteries would be good quality made it worth it.

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In order safely output 100A, I used two 0.15x5.00mm nickel strips for each connection. I realized later that the parallel connections really don't need to be that thick, since those are just balancing the the voltage at that node. The spot welder was mostly pretty good, but it did have some trouble with that strip thickness. I tried to do all the welds near the outside diameter of each battery after hearing about damaging the battery if you weld right in the center.

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Attachments
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scusi   1 mW

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Re: Vespa P200E EV Conversion

Post by scusi » Nov 07 2021 1:17am

Motor and Tires:
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I used some tubeless tires, which were extremely difficult to install on the hub motor. They were also tough to air up.

In order to get the tire over the rim, I used the biggest zip ties I could get my hands on and put them around the tire after getting the first side of the motor in. I tightened them up, taking turns as I gradually worked the rest of the motor in. I tried some big screwdrivers and tire irons first and made some scratches and zero progress, so I'm glad this method worked well.
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To air up the tire, I used a ratchet strap around the outside of the tire to compress it. I then removed the valve stem and blasted it with 100psi (I think, maybe it was higher). This cause the tire to seat on the motor and I was able to air it up normally.

I started with the disc brake on the left side because I thought the caliper would not fit with the shock mount, but eventually switched it to the right side.
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Last edited by scusi on Nov 07 2021 1:33am, edited 1 time in total.

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scusi   1 mW

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Re: Vespa P200E EV Conversion

Post by scusi » Nov 07 2021 1:30am

I used 80/20 to prototype a configuration of my parts that would fit well and eventually found a good arrangement. I never got a good photo of the final layout, but I’ll try to get one soon, along with the wiring diagram.

The battery output is wired to the main circuit breaker, which is also used as a sort of disconnect switch occasionally. I used a 125A DC breaker that is meant as a safety mechanism in the event that the BMS fails to open upon overcurrent.

I used a TE automotive contactor and a ZEVA precharge circuit

Wiring also got cleaned up, but I’m still working on this part. I still want to get the electric brake working too.

Here's some photos of some of the components used and some of the layouts I tried
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scusi   1 mW

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Re: Vespa P200E EV Conversion

Post by scusi » Nov 07 2021 1:40am


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scusi   1 mW

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Re: Vespa P200E EV Conversion

Post by scusi » Nov 12 2021 12:44am

Here’s the scooter on day 1

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SlowCo   10 MW

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Re: Vespa P200E EV Conversion

Post by SlowCo » Nov 12 2021 5:12am

Very nice conversion :thumb:

kingkongshrimp   10 W

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Re: Vespa P200E EV Conversion

Post by kingkongshrimp » Nov 17 2021 4:56pm

Very nice build. Thanks for documenting. I am learning a lot from your build.

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scusi   1 mW

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Vespa P200E EV Conversion

Post by scusi » Nov 26 2021 9:19am

The Votol controller needs to have the battery voltage wired to the lock signal in order to turn on for programming and operation.

Here's the start to my electrical drawings, I still have a lot to add, but this is enough to spin the
vespa electrical drawing 1.jpg
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scusi   1 mW

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Re: Vespa P200E EV Conversion

Post by scusi » Jan 26 2022 5:39pm

I had a pretty unfortunate situation on a test ride and the project is on hold for now.

A negligent driver hit me head on while making an illegal left turn. I was only going about 25 mph, but the Vespa and I both took some pretty bad damage.


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kingkongshrimp   10 W

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Re: Vespa P200E EV Conversion

Post by kingkongshrimp » Jan 26 2022 5:53pm

OH NO!!!

Sorry to hear about your accident. Hope you have quick recovery.

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