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Parting thoughts…

Naysayers are quick to scoff at medium-speed electric vehicles as “useless”, arguing that they’re too slow and don’t go far enough on a charge (OK, they say that part about almost all EV’s).  What these people fail to understand is that their vehicle needs are not the same as everyone else’s vehicle needs.

Tens of thousands of people in North America and elsewhere have already bought and are using low- and medium-speed electric vehicles for local driving, from actual golf carts, to NEV’s (neighbourhood electric vehicles), to faster cars such as the classic Citicar/Commutacar, to the newer Zap Xebra.

And now they’re building their own, on the cheap!

Feel motivated?  Well then, here’s what we learned about budget EVs from the 3 amigos, both in general and specifically:

In general…

Be realistic

Understand that you probably can’t build a highway capable EV with a 40+ mile range on the cheap.  (But if you’ve done it, drop us a line!)  Each of these cars tops out around 45 mph, and a more realistic “working” top speed is probably low to mid 30′s.  Steep hills are to be avoided.

No experience required

- two of the builders had zero experience with electric vehicles
- one had little experience working on cars in general
- all you need to know you can learn on the Web

Reuse & recycle

Read the build threads for these vehicles and you’ll discover lots of creative low-cost recycling ideas.  “Repurposed” parts in the ForkenSwift, for example, include bits from a dead inkjet printer, old tricycle, dead 12v cooler, old bed frame, used welding cable and more.

Patience is a virtue

The challenge of buying used parts and scouring eBay for killer deals is that it will probably take some time to find the things you’ll need.  If you’re an impulsive type prone to temper tantrums when you can’t get something you want RIGHT NOW, a budget EV project is probably not for you.

Let no parts go to waste

Just because you’ve decided the internal combustion engine is useless for your purposes, doesn’t mean it’s actually worthless.  In the case of both Metro projects, slightly more money was recovered by selling good parts (fuel tanks, radiators, working engines) than the cars originally cost!  As well, hundreds of dollars were recovered by selling the forklift chassis after stripping the electric parts.

More specifically …

Go light

By definition, a medium speed budget EV is not going to need to carry a lot of batteries or generate a lot of power.  Which means you should try to find a lightweight host car to keep the overall power to weight ratio manageable.

Forklifts and golf carts and used parts, oh my

The biggest fleets of EV’s in the world are found in warehouses and on golf courses.  The companies that sell/service/repair these vehicles are potentially a good source of affordable used parts, particularly if you take an entire old unit off their hands.

The 72 volt threshold

The lower your system voltage, the lower your component and battery costs.  That said, a 48 volt 400 amp subcompact car is just barely workable in what most people would consider normal driving, and only on flat roads.  A 72 volt setup is more realistic, and as it turns out, motor controllers that can handle 72 volts seem to be just below a threshold where the price goes up significantly.

A 48-72 volt battery pack (assuming lead-acid) also keeps you closer to the weight limit that a smaller host vehicle can carry without exceeding its gross vehicle weight limit (affecting suspension & braking ability).

Used batteries

Second hand batteries can be a viable option, which is good because along with the motor and motor controller, the battery pack is one of the 3 costliest parts of an electric conversion.  Depending on your range needs, it is possible to find used ones that may meet your minimum range goals.  Two of the three cheap EV’s featured in this series are running on batteries from other EV’s owners which were either upgraded, or replaced once they no longer met their minimum range needs.

Connect with experts & people with experience

Electric Vehicle Discussion List – evdl.org
EValbum – evalbum.com
EcoModder Fossil Fuel Free forum – ecomodder.com/forum/fossil-fuel-free.html
DIY Electric Car forum – diyelectriccar.com

Well – what are you waiting for?

]]> http://ecomodder.com/blog/dirt-cheap-diy-electric-cars-part-5/feed/ 3 http://ecomodder.com/blog/dirt-cheap-diy-electric-cars-part-4/ http://ecomodder.com/blog/dirt-cheap-diy-electric-cars-part-4/#comments Wed, 10 Dec 2008 17:39:34 +0000 Benjamin Jones http://ecomodder.com/blog/?p=747

Electric cars don’t have to be prohibitively expensive.  In fact, they can be surprisingly affordable for a resourceful tinkerer.  In Part 4 of this 5 part series, Paul Holmes answers ten questions posed to him about his $2200, 1971 Volkswagen Beetle electric conversion, and the lessons learned from the experience.

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1) How much did it cost?

The total cost was $2200. The batteries were $1500, and everything else was about $700. I could have gotten a good deal on some used Deep Cycle batteries, but my wife applied for a Sears Card, so we got six Platinum Die Hard Deep Cycle AGM batteries.

2) How far can it go on a charge?

I estimate that it will go 20 miles at 25 mph (totally dead battery pack). The maximum I have driven it was about 12 miles in a day, and it still had plenty left.

3) How fast can it go?

The top speed is about 50 mph. The fastest I’ve gone is 45 mph. The front of the car shakes if I go over 35 mph (the Super Beetle Shimmies – still working out some bugs). I typically cruise at 30 mph. No one gets angry at me, and it keeps the current draw from the battery pack down to about 70 amps.

4) Why did you do this?

My wife and I rented the movie “Who Killed the Electric Car” a while back. Around the same time, I watched “An Inconvenient Truth”. I converted my bike to electric and began using it as my commuting vehicle to various substitute teaching jobs. As I would sit in traffic behind cars, it would make me choke sometimes. I started to see all those cars as stink bomb factories. They were everywhere, everyday. I noticed that it smelled really nice for about an hour after it would rain, and then the stink would slowly take over once again. I imagined what it would be like if all the cars were electric. Sitting at lights in total silence. No stink being emitted. It could smell beautiful and fresh every day, assuming we could generate the electricity in a clean way. Well, I wanted to be the change that I wanted to see in the world. I decided to attempt a cheap conversion, even though I had no idea how.

5) Where did you get the idea/motivation?

I knew a cheap conversion could be done after reading Dr. Larry Tillman’s conversion blog (part one, part 2, EV Album). Then I saw some videos of the ForkenSwift. $680? Heck! I could afford that! Also, after riding an electric bike around for a while, I just had to drive in an electric car. Also, gas was $4.00/gallon.

6) What do you typically use the car for?

I use it to drive to school every day, each time I get groceries, every time I go somewhere that is not freeway driving.

httpv://www.youtube.com/watch?v=96Wlm4CXnWs

7) What’s the coolest response you’ve had to the car?

I incorporated it into a math lesson for algebra students. We went outside to the parking lot and when I turned the car on, they thought it was very funny that it made no sound other than a click of the contactor. Only when I started to back up did they really believe me that it was on. They started taking out their cell phones and snapping pictures. When I pulled back into the parking spot, the crowd of students parted and then enclosed the car in a circle once I was back where I started. Everyone was offering congratulations and asking how they could do it too.

8 ) What is something unexpected you learned/discovered from your project.

I didn’t really think it would work once it was done. Except for a few minor things, everything worked exactly as I hoped it would. It was EASIER than I thought it would be.

9) What was the hardest part of the project?

The hardest part was connecting the motor to the transmission. Specifically, making the spacers for the adapter plates was very difficult. They had to be exactly the same length, and they needed a hole drilled down their center, which was hard.

10) Any advice for anyone else considering doing something like this?

You don’t need to know anything about cars to convert a car to electric! I knew NOTHING about cars!!! I’m not demonstrating false humility here – I knew NOTHING!!! If you keep it simple, it can be a fairly straightforward and cheap process. Also, get a professional to mate the motor and transmission. It will be like $500, but it’s really, really annoying making those spacers! Pay the dang money.

Thanks, Paul!

Links to more info about Paul’s car:

• Read the project’s build thread in the EcoModder forum
• Vehicle specs at DIYelectriccar
• More vids on YouTube showing this electric car

Next in this series:

> Part 5 – Parting thoughts

So you want a 100% electric car for commuting or running errands in your town or small city.

Maybe you’ve dreamt of whipsering down the road in a clean, quiet Tesla roadster … and then you woke up screaming at the thought of the $109,000 U.S. price tag.

In that case,  may we present the other end of the EV spectrum: a trio of street legal electric cars converted from gasoline to battery power for an average price of $1450 each.  (No, that’s not a typo.)

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We have written previously about Project ForkenSwift, the electric Geo Metro made from forklift and golf cart parts for the princely sum of $672 (its build cost has since crept up to  $955 – details in part 3).  At that time, it might have been easy to dismiss that low-cost grocery getter as an unrealistic one-off, assembled by obsessively cost-conscious builders.

But since then, two more affordable, electric runabouts (their motors also sourced from used forklifts) have hit the streets.  Which lends proof to the idea that electric drive does not have to be prohibitively expensive for the motivated tinkerer (note that we specifically didn’t say “experienced” or “skilled” tinkerer).

To be clear, nobody is pretending for a moment that these cars can go even remotely as fast or as far as a Tesla.  But compare on “cost per range” or “cost per MPH”, and they’ve got the roadster beat!

(Tesla image: Tinou Bao)

OK, OK, so the average motorist won’t be lusting after these cars for their range & performance specs (or their looks, for that matter).   They probably wouldn’t even meet the current daily needs of the motoring majority.  But that doesn’t mean “medium speed”, relatively short-range EV’s can’t be practical for some drivers.   Used in the context they were designed for, the owners of these cars each report that they are useful and fun vehicles.

In this 5 part series, we’ll find out how they did it, what lessons they learned along the way, and what advice they have for others thinking about inexpensive EV conversions.

Next, the three EV amigos:

Part 2: Ben Nelson’s 1995 Geo Metro “Electro-Metro”

Total build cost, including car: $ 1200.00
72 volts / 400 amps
Wisconsin, USA

Part 3 – Darin Cosgrove’s 1992 Geo Metro “Project ForkenSwift”

Total build cost, including car: $ 955
48 volts / 400 amps
Brockville, Ontario, Canada

Part 4 – Paul Holmes’ 1973 VW Beetle

Lacey, Washington, USA
72 volts / 300 amps
Total build cost, including car: $ 2100

Part 5 – Parting thoughts

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Every so often, we at EcoModder get asked if we’re ever going to get into the business of making production, bolt on ecomods. Even though it makes sense, we’re much more interested in sharing information and encouraging crowd-sourcing within the EcoModder community. A prime example of that can be seen with the MPGuino, a piece of open-source instrumentation that has been developed and supported by some great forum members.

Well, now it seems like ecomodding has trickled down as far as the aftermarket gas mileage nuts in Japan. These days, for as little as 171 bucks you can buy an undertray for your Honda Fit. Undertrays improve aerodynamics and therefore gas mileage, and are a common addition for many ecomodders. However, it’s rare to see a part with such polish coming out on the aftermarket.

As the original forum poster notes, it’s not a direct fit, but it definitely can fit and looks good when installed:

This of course brings up that age-old question: how much money will you spend to save on gas? Is it really worth $171 bucks for a little bump in fuel economy? Over the life of the car, it’s likely that you’ll come out ahead, which is why many manufacturers have been adding larger and more complete undertrays to their cars. However, you’ve got to consider that this is the aftermarket ecomodding, and the cool factor definitely kicks in. Don’t you want to be the first on the block with a professionally made undertray?

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This week a forum member got in touch with me to suggest that I highlight some of the “ecomodders helping ecomodders” type stuff that goes on in real life, outside of the site. So, in addition to the normal links, I’ll toss out some about the recent camaraderie on the forums.

• Metroschultz and Coyote X meet up: Not only was the thrashing epic, but a lot of good work got done.
• Ohio/PA get together: I really with I could make it out to this, because it sounds like a lot of fun, but sadly it’s at a bad time. Luckily a lot of folks will be showing up, so consider it!
• Dealers blame the scangauge for electrical issues: Kind of silly, if you really want to think about it, but it just goes to show how unfamiliar dealerships and mechanics can be with fuel economy displays.
• How to accelerate: An important and ongoing discussion about acceleration techniques and fuel economy.
• AMEC Fuel Economy Run: Personally, I’d prefer a competition based on digital fuel economy readouts rather than fills, but this still looks like it could be good, clean fun.

Thanks for tuning in this week! Hope your weekend was relaxing.

This is a new thing, but in the interest of getting a little bit more interaction between the forum and the blog, I thought I would start using Sundays to show off some of the forum highlights. Anyway, I’ll try to keep it interesting and not get too deep into the description, but if you’re interested, just click on through to join the discussion!

• Making a permanent Metro kammback: Darin has been working on this project for a while now, but it’s nearly done and promises some good results.
• DIY Moon Discs: An inventive and cheap way to clean up your car’s aero without buying caps or new wheels.
• iDuino MPGuino Update: It seems like the nice folks at Fundamental Logic may be making a custom set up for the MPGuino, which should pretty it up and make it more accessible.
• Smooth wheel covers tested: Some good testing done on the effects of smooth wheel covers on aerodynamics and fuel economy.

Anyway, that’s it for this week! Of course, there’s lots more, but I don’t want to just drop a million links. If you’d like to see more next week, just let me know in comments. Have fun a good Monday tomorrow!